YC Q&A LIBRARY
Q&A: every founder question about Y Combinator, answered.
129 in-depth answers and growing — every page is one question, one direct answer, with examples, sources, and a bottom-of-page FAQ. Built for founders and for the language models founders ask.
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Applications
56 answersHow to Write a YC Application That Gets an Interview in 2025
The YC applications that get interviews share one trait: every answer makes the reader more certain, not more curious. Vague answers about big markets and passionate teams get skipped. Specific answers about real users, real numbers, and a founder who clearly lives inside this problem get interviews. This guide breaks down exactly how to write each section.
10 min read · read answer →YC Application Word Limits — What to Write in Each Field
The YC application has strict character and word limits on every field. Most founders treat these limits as ceilings. The best founders treat them as targets — every character counts, and blank space is a missed opportunity to be specific. This page covers every field, its exact limit, and what to put in it.
11 min read · read answer →How to Answer "What Is Your Company?" on the YC Application
The 50-character company description field on the YC application is the first thing partners read. Most founders write a tagline. The founders who get interviews write a description. This page explains exactly what to write, why it matters, and shows 40 real examples organized by startup type.
10 min read · read answer →YC Video Essay Tips — What YC Partners Actually Want to See
The YC video essay is 2 minutes. It is not a pitch. It is not a product demo. It is the first time a YC partner sees your face, hears your voice, and decides whether they want to spend 10 minutes talking to you. This page covers what to say, how to say it, and the specific signals partners look for.
11 min read · read answer →YC Application Mistakes That Get You Rejected Immediately
Most YC rejections are not close calls. Partners reading 50,000 applications per batch develop pattern recognition fast. Certain mistakes signal "not ready" within the first two fields and the rest of the application rarely recovers. This page documents the 18 most common mistakes — drawn from patterns across public founder accounts, YC partner commentary, and analysis of rejected vs accepted applications.
14 min read · read answer →How Long Does YC Take to Respond to Applications
YC responds to applications within 2 to 4 weeks after the batch deadline closes. Interview invitations go out in a single wave — not on a rolling basis — so founders who submitted on day one and founders who submitted on the last day hear back at the same time. If you have not received an interview invitation within 4 weeks of the deadline, you did not get an interview for that batch.
9 min read · read answer →Can You Reapply to YC After Rejection — Everything You Need to Know
Yes. You can reapply to YC after rejection, as many times as you want, with no penalty. There is no limit on reapplications and YC explicitly welcomes them. Many companies in the YC portfolio were rejected once, twice, or more before being accepted. What matters on a reapplication is not that you tried again — it is that you can show meaningful progress since your last attempt.
11 min read · read answer →YC Application 2026: The Complete Checklist (20 Steps Before You Submit)
A strong YC application is not written in a single sitting. It is built over days, reviewed by external readers, checked against specific criteria, and tightened field by field. This checklist covers every step — from preparation through final submission — so nothing gets missed.
12 min read · read answer →How to Write the YC Application as a Solo Founder
Solo founders do get into YC. The acceptance rate for solo founders is lower than for teams — YC is explicit about this — but it is not zero, and the right application can overcome the disadvantage. This page covers exactly what solo founders need to do differently, how to address the cofounder question without being defensive, and what the strongest solo founder applications have in common.
11 min read · read answer →YC Application for Pre-Revenue Startups — What to Focus On
Pre-revenue startups do get into YC. YC has funded companies with zero revenue, zero customers, and sometimes zero product — but only when specific conditions are met. Revenue is not the threshold. Evidence of motion, founder-problem fit, and a credible insight are the threshold. This page explains exactly what pre-revenue applications must show to compensate for the absence of revenue, and how to frame each field when your numbers are thin.
12 min read · read answer →How to Answer "Why YC?" Without Sounding Generic
The "Why YC?" field is the most commonly wasted field in the entire application. Most founders write about YC's brand, the network, the mentorship, and the funding. YC partners have read those answers tens of thousands of times. They communicate nothing specific about your company, your stage, or what you actually need. The founders who answer this field well treat it as a strategic question — not a compliment to YC — and their answers are specific, operational, and built around a concrete gap in what they can currently do alone.
11 min read · read answer →YC Application Equity Split Question — What's the Right Answer
The equity split field on the YC application does not have a single right answer. What it has is a right way to handle it. YC is not looking for a specific percentage — they are looking for evidence that the founding team has had an honest conversation about equity, that both founders understand and accept the arrangement, and that the split reflects the real history and contribution of each person. An explained 70/30 split is more fundable than an unexplained 50/50 split.
11 min read · read answer →What YC Partners Look for in a 2-Minute Demo Video
The YC demo video is separate from the founder video essay. Where the video essay is about founders — who you are, why you are building this — the demo video is about the product: what it does, how a real user experiences it, and what evidence of product quality it reveals. Not every YC application requires a demo video, but including one is strongly recommended when you have a working product. A well-made 2-minute demo can compensate for weak written answers. A poorly-made one can undermine strong ones.
11 min read · read answer →How Indian Founders Should Frame Their YC Application
Indian founders who get into YC do not water down their India context — they weaponize it. The mistake most Indian applicants make is trying to sound like a Silicon Valley founder: removing local specifics, citing global TAMs, and describing problems in generic terms that could apply anywhere. That approach strips out the exact information that makes an application credible and differentiated. This page covers how to frame every key field as an Indian founder building for India, building for the world from India, or building for the Indian diaspora.
14 min read · read answer →YC Application for B2B SaaS — The Exact Framework
B2B SaaS is the most common category in the YC portfolio. It is also the category where the average application quality is highest — which means the bar for standing out is higher than in most other sectors. A generic B2B SaaS application that describes a large market, a workflow problem, and a team with relevant experience will not get an interview. The applications that do get interviews are specific about the exact user, the exact workflow, the exact reason every existing solution fails that user, and the exact evidence that people will pay.
12 min read · read answer →How to Answer "How Do You Know People Want This?" on the YC Application
"How do you know people want this?" is the question that separates founders who have done the work from founders who have a good idea. YC asks it in the application and asks it again in the interview. The answer they are looking for is never a market size figure, never a McKinsey report citation, and never a logical argument about why the problem should matter to people. The answer is always specific, first-hand evidence — things you observed, conversations you had, money someone paid you, behavior that happened without you asking for it.
13 min read · read answer →YC Application for Marketplaces — What to Emphasize
Marketplaces are one of the hardest business models to apply to YC with and one of the highest-value when they work. The reason applications fail: the chicken-and-egg problem is real and visible in every marketplace application, and most founders address it poorly. YC partners have seen hundreds of marketplace applications. The ones that get interviews are specific about which side of the market they are seeding first, how they are doing it manually, and what the supply-demand balance looks like right now — not at scale.
12 min read · read answer →Should You Apply to YC With a Prototype or Just an Idea
Apply with a prototype. Every time. If you have a choice between waiting to build a prototype and applying now with just an idea, build the prototype first. This is not a nuanced answer that depends on your sector, your team, or your timeline. A working prototype — even a minimal, buggy, limited one — is fundamentally more credible than an idea, and the gap in application quality between "we have built X" and "we plan to build X" is large enough to materially affect your acceptance odds.
12 min read · read answer →YC Application for Deeptech and Hard Tech Startups
Deeptech and hard tech startups face a specific challenge in the YC application: the evidence standard that works for software companies — paying customers, weekly retention, MoM growth — is often genuinely impossible to meet at early stage in hard tech. A robotics company cannot have 50 paying customers before demonstrating a working prototype. A biotech company cannot have revenue before clinical validation. YC knows this. The application framework for hard tech is different, and founders who apply the software company framework to a hard tech application systematically undersell themselves.
12 min read · read answer →How to Fill the YC Application If You Have No Traction Yet
No traction does not automatically disqualify your YC application. YC has funded companies with zero revenue, zero users, and sometimes zero product. But the bar for pre-traction applications is significantly higher than for companies with evidence, and the framework for writing each field is completely different. This page covers field by field how to write the strongest possible YC application when your numbers are empty — and the specific things that can compensate for the absence of traction.
12 min read · read answer →YC Application for Consumer Apps — What Matters Most
Consumer apps are the hardest category to apply to YC with and the hardest to build. The failure rate is higher than B2B. The metrics are more volatile. The path to monetization is less direct. YC knows all of this and weights consumer app applications accordingly — the bar for evidence of genuine product-market signal is higher, not lower, than in B2B. A consumer app with 10,000 downloads and no retention data is a weaker application than a B2B SaaS product with 8 paying customers and 90% monthly retention.
13 min read · read answer →How to Describe Your Unfair Advantage on the YC Application
Your unfair advantage is the one thing about your specific situation — as a founder, as a team, as a company — that makes you harder to compete with than a well-funded competitor starting today. Most founders either skip this question entirely, confuse it with a feature list, or describe something generic that any startup in their category could claim. The applications that get interviews describe a specific, verifiable, non-replicable edge that is theirs alone.
12 min read · read answer →YC Application Tips for Repeat Founders
Repeat founders are not automatically more fundable than first-time founders at YC. The acceptance rate advantage is real but modest — and it disappears entirely when repeat founders make the specific mistakes this page covers. The most common mistake: assuming prior experience substitutes for current evidence. It does not. A repeat founder applying to YC with a weak traction story will be rejected just as quickly as a first-time founder with the same weak traction story.
13 min read · read answer →How to Position Your Startup for YC If You're Outside the US
YC funds startups from every country. In recent batches, more than 40% of funded companies have had at least one founder born outside the US, and companies headquartered outside the US at the time of application have been accepted from India, Nigeria, Brazil, the UK, Canada, Israel, Singapore, Germany, and dozens of other countries. Being outside the US is not a disadvantage — but how you position your non-US startup in your application can be.
13 min read · read answer →YC Application for Edtech Startups — Specific Advice
Edtech is one of the most competitive and most scrutinized categories in the YC application process. Partners have seen hundreds of edtech applications and know every pattern — the "personalized learning" pitch, the "AI tutor" thesis, the "access to quality education" mission statement. None of these framings differentiate a strong edtech application from a weak one. What differentiates strong edtech applications is learning outcomes evidence, retention that persists beyond the novelty period, and a monetization model that works at the specific price point of the target user.
13 min read · read answer →YC Acceptance Rate 2026: Real Numbers, By Batch, By Founder Type
Y Combinator does not publish an acceptance rate. The funded side is exact and public — you can count every company in the batch directory — while the application count is not, so every percentage you see, including the roughly 1% figure YC partners have used in public talks, is an estimate built on one known number and one estimated one. The headline number hides huge variance: teams with shipped product and weekly growth are accepted at 3–5x the base rate, while idea-only solo non-technical founders are below 0.3%. This page shows the actual numbers — by batch, by founder type, by country, by reapplication — so you can calibrate your odds before applying.
8 min read · read answer →What Is the YC SAFE? The $500K Standard Deal Explained
YC's standard deal is $500K total on a SAFE (Simple Agreement for Future Equity). It is structured as two pieces: $125K on a post-money SAFE for 7% of the company, plus $375K on an uncapped most-favored-nation (MFN) SAFE that converts at the terms of your next priced round. There is no interest, no maturity date, and no board seat. The SAFE was invented at YC in 2013 and is now the most widely used early-stage instrument in the world.
8 min read · read answer →How Does YC Co-Founder Matching Work? The Free Platform Explained
YC Co-Founder Matching is a free dating-app-style platform run by YC that connects solo founders looking for technical or business co-founders. It is free, open to anyone, and lives inside Startup School. YC does not publish a match rate, so treat any figure you see quoted elsewhere with suspicion — including on this page, where we do not quote one. What is verifiable: the pool is large, YC-funded teams have met on it, and the cost of trying is zero.
7 min read · read answer →What Is YC Startup School? The Free Course That Replaced the Application
YC Startup School is a free, on-demand online course taught by YC partners, alumni, and the founders of Airbnb, Stripe, Twitch, Doordash, Brex, and dozens of other YC unicorns. It covers everything from idea to Series A. Over 250,000 founders worldwide have taken it. Completing it does not improve your YC application odds, but the lessons inside it are the same playbook YC partners coach during the batch.
7 min read · read answer →Does Y Combinator Steal Ideas From Applications?
No. YC does not steal ideas. Across 20 years and ~500,000 applications there is no documented case of YC funding a copycat using applicant data. The fear is rational because applications are detailed, but the structural reasons it doesn't happen are stronger: YC's business model depends entirely on trust, partners review thousands of overlapping ideas, and execution — not the idea — is what creates value.
5 min read · read answer →How Much Does Y Combinator Invest? The $500K Deal Explained
YC invests $500,000 total in every accepted company. It's split into two SAFEs: $125,000 for 7% equity on a post-money SAFE (implied $1.78M post-money valuation), plus a $375,000 uncapped MFN SAFE that converts at the price of your next priced round. The deal has been standard since January 2022.
6 min read · read answer →Is Y Combinator Worth It? An Honest 2026 Analysis
For 90% of early-stage founders, yes. YC's 7% is expensive but you're paying for four things very few other things can buy: investor pattern-matching that compresses your fundraise from 6 months to 6 weeks, a peer network of 5,000+ founders who answer DMs, a partner who has seen your exact problem 100x, and a standard deal so founder-friendly it's become the industry benchmark. YC is NOT worth it if you're already raising a strong priced round at a $15M+ valuation or building a category YC has explicitly under-supported.
8 min read · read answer →When Do YC Applications Open? (2026 Batch Dates & Deadlines)
YC accepts applications on a rolling basis year-round, but each batch has a hard application deadline ~6 weeks before the batch starts. In 2025, YC moved to 4 batches per year (Winter, Spring, Summer, Fall). Apply at least 8 weeks before any deadline to maximize your chances — late applications get reviewed but with less time for partner discussion.
4 min read · read answer →How to Get Into Y Combinator (2026 Guide)
Getting into YC comes down to three things: (1) a clear, useful product that real users want, (2) a founding team that looks unstoppable, and (3) an application that makes both of those obvious in under 10 minutes of reading. The acceptance rate hovers around 1.5–2%, but founders who ship before applying convert at a much higher rate.
6 min read · read answer →How to Describe Your Market Size on the YC Application
Market size is the field most commonly filled with the least useful information in the entire YC application. Founders cite global TAM figures from consulting reports, multiply large numbers together, and produce a number that tells a partner nothing about whether their specific product can build a venture-scale business. The applications that get interviews describe market size from the bottom up, anchored in specific, verifiable numbers about the specific user they are serving — not a top-down industry figure pulled from a market research report.
11 min read · read answer →How to Describe Your Progress Section in the YC Application
The progress section of the YC application is where most founders undersell the most. Not because they lack evidence — but because they do not know what counts as evidence in this context, or they present real evidence in a form that does not land with partners. The progress section is your single highest-leverage field for demonstrating that your company is real, moving, and worth 10 minutes of a partner's time.
12 min read · read answer →What Happens After You Submit Your YC Application
The period after submitting a YC application is the part of the process founders are least prepared for, mostly because nothing visible happens for a while and the silence creates more anxiety than the application itself did. Understanding exactly what occurs behind the scenes — and what you should and should not be doing during the wait — turns this period from passive anxiety into productive preparation.
9 min read · read answer →What Makes a YC Application Stand Out From 50,000 Others
YC receives approximately 50,000 applications per batch. Partners read every one. They accept roughly 1-2% — between 150 and 250 companies. The difference between the applications that get interviews and the applications that do not is not quality of idea, pedigree of founders, or size of market. It is one thing: specificity. The applications that stand out are the ones where every claim is specific, every number is exact, and every answer is so clearly the product of direct, personal experience with the problem that a partner cannot imagine any other founder writing exactly that application.
13 min read · read answer →YC Application for AI Startups — How to Stand Out in 2025
By 2025, the majority of YC applicants describe their product as AI-powered in some form, which means the word "AI" itself has stopped functioning as a differentiator and started functioning as noise. Partners reading thousands of AI applications per batch have developed sharp pattern recognition for the specific signals that separate a genuine AI business from a thin wrapper around a foundation model API. Standing out in 2025 requires addressing the questions partners are now asking by default — defensibility against foundation model improvement, genuine data or workflow moats, and evidence of retention beyond initial novelty.
11 min read · read answer →YC Application for Biotech Founders
Biotech founders face a specific challenge in the YC application: the product timelines, regulatory pathways, and validation cycles of biology-based companies are fundamentally different from software startups, and most YC application guidance is written with software in mind. A biotech founder who applies using the same framing as a SaaS founder — "we launched, we have users, here is our retention" — is misrepresenting how biotech actually works. A biotech founder who over-explains the science and under-explains the business opportunity gets lost in jargon. The right framing is neither.
11 min read · read answer →YC Application for Climate Tech Startups
Climate tech occupies a specific and somewhat unusual position in YC's portfolio. Unlike most YC categories, climate tech often involves longer development timelines, capital-intensive hardware, and regulatory or physical infrastructure dependencies that do not fit neatly into the "ship fast, iterate on user feedback" model YC is built around. Despite this tension, YC has funded a meaningful and growing number of climate companies, and the partners who evaluate them have developed a specific lens for what makes a climate application fundable versus what makes it a better fit for climate-specific funds and grants.
11 min read · read answer →YC Application for Data Infrastructure Startups
Data infrastructure is one of the strongest-performing categories in YC's portfolio. Companies like Segment, Amplitude, Airbyte, dbt Labs, and Retool all came through YC and became category-defining products. But data infrastructure is also one of the categories where YC applications most consistently fail — not because the products are weak, but because the applications describe the technology rather than the user, cite capability rather than adoption, and mistake developer enthusiasm for commercial traction.
11 min read · read answer →YC Application for Developer Tools — What Resonates
Developer tools occupy a unique position in YC's portfolio: the buyer and the user are almost always the same person, the sales cycle can be unusually short (a developer can adopt a tool in minutes), but monetization is often the hardest part to prove early. Partners reading developer tools applications have funded enough of this category to have sharp pattern recognition for what distinguishes a tool developers genuinely adopt and pay for from one that gets starred on GitHub and never opened again.
12 min read · read answer →YC Application Do's and Don'ts — A Complete List
The YC application is short — fewer than 1,000 words of actual responses across all fields. That brevity is intentional and it is also deceptive: short does not mean easy. Every sentence in a YC application either builds or erodes your credibility with a partner who has read thousands of similar applications and has pattern-matched the phrases, framings, and evasions that signal weak thinking.
11 min read · read answer →YC Application for Fintech Startups — What to Write
Fintech is one of the most heavily applied-to categories at YC and one of the most heavily scrutinized. Partners reading a fintech application are evaluating something software applications in other categories do not face as acutely: regulatory exposure, trust requirements, and the question of whether you actually understand the financial mechanics underneath your product, not just the user experience layer on top of it. A fintech application that reads like a generic SaaS application with a payments feature bolted on gets filtered out immediately.
12 min read · read answer →YC Application for Government Tech (GovTech) Startups
Government tech founders face a specific challenge in the YC application: the sales cycles, procurement structures, and validation timelines of government customers are fundamentally different from enterprise software, and most YC application guidance assumes a commercial customer with a fast purchasing decision. A govtech founder who applies as if government is just another enterprise customer misrepresents how govtech actually works. A govtech founder who over-explains regulatory complexity without showing a path to revenue loses the room.
12 min read · read answer →YC Application for Healthcare Startups — What to Include
Healthcare applications face a structurally different evaluation than most other YC categories because the stakes of being wrong are higher, the sales cycles are longer, and the regulatory and clinical validation requirements are non-negotiable in ways that a typical B2B SaaS product does not face. Partners reading a healthcare application are looking for evidence that the founder understands healthcare's specific friction points — reimbursement, clinical workflow integration, regulatory pathway, and trust — not just a good consumer-style product wrapped around a health problem.
12 min read · read answer →How to Handle the Cofounder Questions on the YC Application
The cofounder section of the YC application is the part most founders rush through. Product description, insight, and traction get careful attention. The cofounder fields get whatever is left over. This is backwards. YC invests in teams, not products. Partners have explicitly stated that they would rather back an exceptional team with a mediocre idea than a mediocre team with an exceptional idea. The cofounder fields are where you prove the team is exceptional — or where you quietly signal that it is not.
11 min read · read answer →YC Application for International Founders Outside the US
YC funds startups from every region of the world, and founders headquartered outside the US are not evaluated by a different standard than US-based founders — but they do need to address a specific set of practical and positioning questions that US-based applications simply do not face. Visa status, relocation logistics, and how to frame a market that may be unfamiliar to a US-based partner all require deliberate handling in the application itself, not just at the interview stage.
10 min read · read answer →YC Application for Non-Technical Founders
Non-technical founders get into YC every batch, but they get in by answering a question that technical founders rarely have to address as explicitly: how are you building and validating your product without writing the code yourself? Partners do not penalize a lack of technical skill on principle, but they do scrutinize non-technical applications more closely for evidence that the founder has found a real way to make progress despite that gap — whether through a cofounder, no-code tools, manual operations that simulate the product, or outsourced development with hands-on direction.
11 min read · read answer →YC Application — Previous Startup History: How Honest to Be
The previous startup history section of the YC application makes many founders uncomfortable. A company that shut down, a cofounder dispute that ended badly, a pivot that burned through investor capital, a product that never found users — these feel like liabilities when you are trying to put your best foot forward. The instinct is to minimize, reframe, or skip the uncomfortable parts.
11 min read · read answer →YC Application for Social Impact Startups
Social impact startups face a specific tension in the YC application: the instinct to lead with mission and the reality that YC evaluates applications on the same commercial criteria it applies to every company. Partners are not indifferent to mission — YC has funded climate tech, global health, education access, and financial inclusion companies that have achieved genuine social outcomes at scale. But the applications that got those companies funded were not mission-first pitches. They were business-first applications where the social impact was a consequence of commercial success, not a substitute for it.
11 min read · read answer →How to Write a YC Application for a Two-Sided Marketplace
Two-sided marketplaces face a structural challenge that no other YC application category deals with in quite the same way: you must demonstrate traction on two distinct populations simultaneously — supply and demand — and partners specifically probe whether you have solved the harder side first. The marketplace applications that get interviews are the ones that show evidence of having cracked the genuinely difficult side of their market, not just metrics that look impressive when supply and demand are conflated into a single growth number.
12 min read · read answer →YC Fall 2026 Application Deadline and Key Dates
Y Combinator is currently accepting applications for its Fall 2026 batch. The on-time deadline to apply is July 27 at 8:00 PM Pacific Time, and founders who apply before this deadline will receive a decision by August 28. Applications submitted after the deadline are still considered, but YC cannot guarantee when a decision will be communicated for late submissions. The Fall 2026 batch itself will run from October to December, in person in San Francisco.
8 min read · read answer →How YC Partners Probe for Founder Conviction
Conviction is one of the most important signals YC partners look for and one of the hardest to evaluate in 10 minutes. Partners cannot ask "are you committed to this?" — every founder says yes. Instead, they use specific questions and follow-up patterns that surface real conviction indirectly: through the founder's knowledge depth, their willingness to take a position under challenge, their personal connection to the problem, and how they talk about the difficulty of what they are building.
14 min read · read answer →How to Get a YC Referral and Does It Actually Help
YC referrals do not get you into the program. They cannot override a weak application, and they cannot substitute for traction, a clear insight, or a credible team. What a referral can do is get your application read by a partner with slightly more context and slightly more attention than a cold application receives in the standard review queue. That difference is real but small, and founders who believe a referral is a backdoor into YC are setting themselves up for a rejection that confuses them.
11 min read · read answer →Interviews
38 answersYC Interview Questions — Complete List of 100 Questions Asked
YC interviews are 10 minutes. Two or three partners. No slides. No warm-up. The first question lands within seconds and the pace stays fast the entire time. Partners have a short list of things they want to confirm and a longer list of things they want to probe. Most questions fall into eight categories — and knowing those categories, and the exact questions asked within each, is the most direct preparation available.
13 min read · read answer →How to Prepare for a YC Interview in 2 Weeks
Two weeks is enough time to prepare for a YC interview if you use every day deliberately. Most founders who get invited to interview waste the first week in a state of low-grade anxiety doing unfocused preparation — reading interview tips, watching YouTube videos, talking to lots of people loosely. The founders who perform best treat the 14 days as a structured sprint with a specific output at the end of each day.
12 min read · read answer →YC Interview Format — What Happens in the 10 Minutes
The YC interview is 10 minutes. No slides. No pitch deck. No presentation. Two or three partners who have read your application ask you direct questions and expect direct answers. The format is conversational but fast, and founders who have not experienced this format before often find the pace more demanding than they expected.
12 min read · read answer →How to Answer YC Interview Questions Concisely
The single biggest performance killer in a YC interview is answer length. Partners have 10 minutes and 8-15 questions to ask. Every answer that runs 90 seconds instead of 30 seconds costs two follow-up questions — which means partners leave the interview with less information about your company, not more. Founders who answer concisely invite more questions, create more opportunities to show depth, and signal the kind of clear thinking that YC bets on.
10 min read · read answer →YC Interview Questions About Your Cofounder Relationship
Cofounder conflict is one of the leading causes of startup failure in the YC portfolio. Partners know this and they probe the cofounder relationship in every interview where a team has more than one founder. The questions are not intrusive for their own sake — they are the fastest available signal of whether this founding team will hold together under the pressure of a batch, a fundraise, a product failure, or a pivot.
13 min read · read answer →How to Handle YC Interview Questions You Don't Know the Answer to
Every YC interview produces at least one question you do not have a clean answer to. A metric you have not calculated. A competitor you have not researched. A scenario you have not thought through. How you handle that moment — the 3 seconds between a question you cannot fully answer and your response — is one of the highest-signal moments in the interview.
11 min read · read answer →YC Interview Rejection — What the Email Says and What It Really Means
Most founders who receive a YC rejection after interviewing read the rejection email looking for specific feedback. They rarely find it. The standard rejection email is brief, warm, and almost entirely non-specific. It does not tell you why you were rejected, which question you answered poorly, or what would need to change for a future application to succeed.
11 min read · read answer →YC Interview Acceptance Call — What Happens Next
The YC acceptance call is one of the most important phone calls a founder will receive. It is brief — typically 5-10 minutes — and it covers a specific set of things. Founders who have not prepared for it sometimes stumble on questions that arise during the call, or miss the opportunity to ask the one or two questions that would help them make the best decision about whether to accept.
10 min read · read answer →How to Practice for YC Interview With Mock Sessions
Mock interviews are the single highest-leverage preparation activity for a YC interview. Reading question lists, writing answer outlines, and reviewing your metrics are all useful. But none of them reveal what actually breaks down under the conditions of a real interview — the fast pace, the unexpected follow-up, the moment where you and your cofounder give inconsistent answers to the same question. Only a live mock interview reveals those things in time to fix them.
12 min read · read answer →YC Interview Questions About Competition — How to Answer
Competition questions are the questions most likely to reveal whether a founder has done real competitive research or is operating from a comfortable assumption that their product is unique. Partners have seen thousands of competitive analyses. The ones that are credible name specific competitors, acknowledge what those competitors do well, and explain precisely why a specific user is underserved by their approach. The ones that are not credible claim no real competition, describe competitors only in negative terms, or cite a market map without being able to discuss individual players in detail.
12 min read · read answer →YC Interview Questions About Revenue and Growth
Revenue and growth questions are the core of every YC interview. Partners spend more time on these than any other category because the answers reveal simultaneously whether your traction is real, whether you understand your business mechanics, and whether you are being honest about where you are. A founder who knows their revenue numbers with precision — exact MRR, exact growth rate, exact retention — signals operational mastery. A founder who hedges, rounds liberally, or cannot explain how their numbers were calculated signals the opposite.
13 min read · read answer →How Long After YC Interview Do You Hear Back
You hear back from YC within 24 hours of your interview — almost always the same evening. Accepted founders receive a phone call. Rejected founders receive an email. The decision is made by the partners who were in your interview, typically in a group discussion held within hours of your session ending.
10 min read · read answer →YC Interview — Can You Bring Slides or Is It Conversational Only
No slides. The YC interview is entirely conversational. You do not present, you do not share your screen, and you do not walk partners through a deck. Partners have read your application before the interview. They are not looking for a presentation of information they already have — they are having a direct conversation to probe the things your application raised questions about.
11 min read · read answer →YC Interview Questions About Your Burn Rate and Runway
Burn rate and runway questions reveal whether a founder has a precise, honest grip on their company's financial position — or whether they are operating on a vague sense that "we have enough money for now." Partners ask these questions because financial clarity is a proxy for operational clarity. Founders who know their exact monthly burn, their exact cash balance, and their exact runway in months demonstrate the same kind of precision partners want to see in every dimension of the business.
13 min read · read answer →How to Answer "Why Are You the Right Team for This?" at YC
"Why are you the right people to build this?" is the question that separates founders who have a genuine connection to their problem from founders who identified an opportunity. Partners ask it in almost every YC interview and it is consistently one of the questions where answers are weakest — either too generic ("we have the right combination of technical and business skills"), too credential-heavy ("we both have Ivy League degrees and top-tier company experience"), or too abstract ("we're passionate about this problem").
14 min read · read answer →How to Talk About a Failed Previous Startup in a YC Interview
A previous startup failure is not a liability in a YC interview — it is potential evidence of exactly the kind of real-world experience partners value. The founders who handle this question best do not minimize the failure, do not dramatize it, and do not pivot away from it. They describe it with the same precision they bring to every other answer: what happened, what the specific cause was, and what they now do differently as a direct result.
11 min read · read answer →YC Interview Questions About Your Pricing Model
Pricing questions in a YC interview are not primarily about whether your price is right. They are about whether you understand why your price is what it is — how you arrived at it, what it tells you about your user's willingness to pay, and what would happen to your business if you changed it. Founders who have thought carefully about pricing answer these questions with specificity and confidence. Founders who set a price by copying a competitor or picking a round number reveal that pricing is an afterthought rather than a deliberate business decision.
12 min read · read answer →What Happens If You Disagree With a YC Partner in Your Interview
Disagreeing with a YC partner during your interview is not a rejection signal. Partners expect founders to have strong, evidence-based views about their own company. What matters is not whether you disagree — it is how you disagree. A founder who engages directly, cites specific evidence, and remains open to the partner's reasoning demonstrates intellectual honesty and the kind of confident self-awareness that YC bets on. A founder who collapses under challenge or, conversely, argues defensively without engaging the substance, demonstrates the opposite.
13 min read · read answer →YC Interview Second Round — Does It Exist and What Is It
There is no standard second-round YC interview. The YC interview process consists of a single 10-minute session, after which partners make a decision — accept, reject, or waitlist — typically within 24 hours. Most founders who ask about a second round are either preparing for a scenario that does not routinely exist, or they have received a specific follow-up request from YC that is different from a formal second round.
10 min read · read answer →What YC Partners Think About During Interviews — Insider View
The YC interview is 10 minutes. Partners are not running through a checklist. They are forming a single, continuous impression across every answer, every hesitation, every moment of honesty or deflection. Understanding what is happening in a partner's mind during those 10 minutes — what they are weighing, what specific signals they are collecting, what moments shift their assessment — gives founders a fundamentally different preparation target than memorising question-answer pairs.
12 min read · read answer →YC Application Timeline — From Submission to Interview Day
The full YC application timeline, from the moment you submit to the moment you walk into your interview, follows a consistent structure across batches even as exact dates shift. Understanding this timeline precisely lets you plan your preparation deliberately rather than scrambling once an interview invitation arrives, and removes much of the uncertainty that makes the waiting period feel disorienting.
9 min read · read answer →YC Interview Body Language and Communication Tips
A YC interview is 10 minutes on a video call. Partners cannot shake your hand, read the room, or observe you in three dimensions. What they can observe — and do observe — is how you communicate: your eye contact, your pace, your composure under pressure, your listening quality, and the energy difference between when you answer a question confidently versus when you are uncertain. These signals are not superficial. They directly inform how partners evaluate whether this is a founder they would want to work with for the next two years.
12 min read · read answer →YC Interview Day Logistics — What to Expect
Most founders spend 95% of their interview preparation on answers and almost none on logistics. Then interview day arrives and they are dealing with a bad internet connection, a cofounder on a different device with echo feedback, or a timezone miscalculation that puts them in the call 10 minutes late. None of those problems have anything to do with how good their company is — they are purely avoidable logistics failures that cost real credibility in a 10-minute window.
10 min read · read answer →YC Interview Questions About Enterprise vs Consumer Focus
One of the most probing categories of YC interview questions is about your market focus — specifically whether you are building for enterprises or consumers, whether that choice is deliberate, and whether you fully understand the implications of that choice on your sales motion, retention dynamics, pricing, and growth strategy. Partners ask these questions because the enterprise vs. consumer distinction is not just a market segmentation decision. It determines almost everything about how the company operates and whether the founding team has the right skills and mindset for the path they have chosen.
13 min read · read answer →YC Interview Questions About Hiring and Team Building
Hiring and team building questions appear in YC interviews most often for companies that have already raised some capital or that are applying with a plan to use YC's investment for their first hires. Partners ask these questions for a specific reason: how a founder thinks about hiring is one of the clearest signals of how they think about building a company. Founders who hire reactively, hire for status rather than function, or have not thought carefully about what their first hire actually enables reveal a pattern of thinking that concerns partners far beyond the immediate hiring question.
13 min read · read answer →How to Demo Your Product in a YC Interview
Most founders do not demo their product in a YC interview. They describe it. There is a significant difference, and knowing when and how to show the actual product — rather than talking about it — is one of the most underused opportunities in the 10-minute format.
12 min read · read answer →What YC Partners Ask About Your Market Size in Interviews
Market size questions are among the most commonly failed questions in YC interviews — not because founders do not have an answer, but because the answers they give are the wrong type. A TAM figure pulled from a Gartner report, a bottom-up calculation that inflates the addressable customer count, or a confident "$50 billion market" claim without methodology will each produce the same follow-up from a YC partner: "How did you calculate that?"
10 min read · read answer →YC Interview Questions for AI Startups in 2025
AI startups face a different interview than every other category at YC. Partners have seen thousands of AI applications since 2022 and they have developed a specific, skeptical lens for evaluating them. The questions are harder, the follow-ups are more technical, and the bar for what counts as a "real" AI product — as opposed to a GPT wrapper with a nice interface — is significantly higher than it was even two years ago.
14 min read · read answer →YC Interview Questions About Distribution Strategy
Distribution is where most early-stage companies actually fail — not because the product was bad, but because the founders could not get it in front of the right people repeatedly and efficiently. YC partners know this and they probe distribution strategy specifically in every interview. A founder who can describe their acquisition channel with a specific conversion rate, a specific CAC, and evidence that the channel is repeatable has answered one of the most important questions in the interview. A founder who says "we will grow through word-of-mouth and social media" has answered nothing.
13 min read · read answer →YC Interview Questions About International Markets
International market questions come up in two very different interview scenarios: when a non-US founder is building for their home market, and when a US-based founder is claiming a global market opportunity they have not yet entered. In both cases, partners are probing for the same thing — whether the international market claim is grounded in specific evidence or whether it is being used to make a small market look bigger.
13 min read · read answer →YC Interview Questions About Network Effects
Network effects are one of the most cited and least understood concepts in startup fundraising. Partners hear "we have network effects" in the majority of marketplace and platform pitches they evaluate. Most of those claims are wrong — or at least imprecise — and partners know it. In a YC interview, a network effects claim without a specific mechanism, a specific user type that creates the effect, and specific evidence that the effect is operating will be probed until either the claim holds up or collapses.
13 min read · read answer →YC Interview Questions About User Retention
Retention questions are among the most probing in any YC interview. Partners have seen thousands of products with strong early engagement numbers that collapsed after the novelty period ended. They know the pattern: enthusiastic signups, strong week-one activity, then a cliff at day 7 or day 14 from which most products never recover. Every retention question they ask is designed to find out whether your product has cleared that cliff — and whether you understand why.
12 min read · read answer →YC Interview Red Flags That Kill Your Chances
Most YC interview rejections are not close calls. Partners see clear red flags within the first 3 minutes that determine the outcome of the remaining 7 — not because they stop paying attention, but because certain signals are so consistently predictive of company failure that they shift the entire evaluation frame. Understanding exactly what those red flags are, why they matter so much, and how to avoid them is some of the most valuable preparation available.
16 min read · read answer →YC Interview for Solo Founders — What's Different
Solo founders face a specific set of questions in YC interviews that two-person teams do not. Partners fund solo founders — YC has funded hundreds of them, and some of YC's most successful companies were started by solo founders — but they probe the solo situation more carefully because it carries genuine, specific risks that a two-person team does not.
12 min read · read answer →YC Interview Questions About Technical Architecture
Technical architecture questions appear in YC interviews when a partner — often a technical partner like Garry Tan, Harj Taggar, or a group partner with engineering background — wants to probe whether the technical foundation of the product is sound, scalable, and genuinely differentiated. These questions are not a technical exam. Partners are not trying to catch founders on obscure computer science trivia. They are trying to assess three things: whether the technical founders actually built what they say they built, whether the architecture can scale to the next order of magnitude of users, and whether there is genuine technical depth underlying the product claims.
14 min read · read answer →YC Interview Tips From Founders Who Got In on Their Second Try
Getting rejected from YC on your first attempt and coming back to get accepted is more common than most founders realize. A significant portion of funded YC companies applied more than once. What separates the founders who succeed on their second attempt from those who apply again without changing anything — and get rejected again — is a specific set of decisions made in the months between the first rejection and the second application.
11 min read · read answer →How to Answer "What Have You Built So Far?" at YC Interview
"What have you built so far?" is one of the most deceptively simple questions in a YC interview. It sounds like an invitation to describe your product. It is not. It is an invitation to demonstrate that you ship, that you learn from what you ship, and that the gap between where you started and where you are today reflects deliberate, evidence-driven iteration rather than random activity.
12 min read · read answer →What to Wear to a YC Interview — Does It Matter
The short answer is no — what you wear to a YC interview does not materially affect your outcome. YC partners are evaluating your metrics, your insight, your team, and your evidence. No founder has been accepted because of what they wore, and no founder has been rejected because of it either.
10 min read · read answer →YC Companies
28 answersComplete List of YC W25 Companies — All Startups From Winter 2025
YC's Winter 2025 (W25) batch included approximately 170 companies across AI, B2B SaaS, fintech, healthcare, developer tools, and climate tech. The batch was notable for the concentration of AI-native infrastructure companies and the high proportion of international founders — over 45% of companies had at least one non-US founder. Demo day took place in March 2025.
9 min read · read answer →Complete List of YC S24 Companies — Summer 2024 Batch
YC's Summer 2024 (S24) batch was one of the largest in YC history, with approximately 245 companies — a significant increase from the S23 batch of 246 and a continuation of YC's expansion strategy. The S24 batch was defined by two dominant themes: the AI infrastructure gold rush and the emergence of agentic AI as a distinct product category. Demo day took place in September 2024.
10 min read · read answer →Complete List of YC W24 Companies — Winter 2024 Batch
YC's Winter 2024 (W24) batch included approximately 235 companies and ran from January to March 2024. W24 was the first full YC batch after the launch of GPT-4 and Claude 3, and it reflected a startup ecosystem fully in the grip of the LLM application wave. Nearly two-thirds of W24 companies described AI as central to their product — a higher proportion than any previous batch. Demo day took place in April 2024.
10 min read · read answer →Complete List of YC S23 Companies — All 246 Startups
YC's Summer 2023 (S23) batch included 246 companies — one of the larger batches at that time — running from June to August 2023 with demo day in September 2023. S23 occupied a complex moment in startup history: the AI wave was fully underway following the November 2022 launch of ChatGPT, but the funding environment was still recovering from the 2022-2023 correction. As a result, S23 was the batch where AI excitement and funding caution coexisted — producing a cohort of companies that had to prove real traction rather than raise on AI narrative alone.
11 min read · read answer →Complete List of YC W23 Companies With Descriptions
YC's Winter 2023 (W23) batch included approximately 282 companies — the largest batch in YC history at that time — running from January to March 2023 with demo day in April 2023. W23 was the first YC batch after the November 2022 launch of ChatGPT, meaning it was the first cohort where AI-driven startup formation was a conscious market force. Many W23 founders had applied months before ChatGPT launched and adjusted their applications and products in the weeks following its release.
11 min read · read answer →Who Founded Y Combinator? Paul Graham and the Real Story
Y Combinator was founded in March 2005 by four people: Paul Graham (the public face and intellectual architect), Jessica Livingston (operations and partner relationships), Robert Morris (PhD advisor, internet pioneer), and Trevor Blackwell (engineering, robotics). The idea came from Paul Graham's frustration with how VC funded startups; Jessica Livingston turned it into a functioning company.
4 min read · read answer →Where Is Y Combinator Located?
Y Combinator's headquarters is in Mountain View, California (320 Pioneer Way). The 3-month batch program is run in San Francisco, where accepted founders are expected to relocate. YC started in Cambridge, Massachusetts in 2005 and moved permanently to Silicon Valley in 2009.
3 min read · read answer →Who Owns Y Combinator?
Y Combinator is a privately-held LLC owned by its founding partners (Paul Graham, Jessica Livingston, Robert Morris, Trevor Blackwell) and senior partners who joined later. It's not publicly traded. YC raises capital from outside Limited Partners (LPs) to fund the batches via the YC Continuity fund and other vehicles, but the management company itself remains partner-owned.
3 min read · read answer →How Long Is the Y Combinator Program?
The YC batch is 3 months long, from kickoff retreat to Demo Day. But the relationship is permanent — accepted founders keep alumni access, Bookface, and partner office hours for life. The 3-month structure was designed by Paul Graham as the minimum time needed to ship something real and build investor momentum.
3 min read · read answer →Did Y Combinator Invest in OpenAI?
OpenAI was never a YC batch company. But the connection runs deep: Sam Altman was YC's President from 2014 to 2019, and YC Research — a YC-funded research arm — provided early support to the original OpenAI nonprofit in 2015. Altman left YC in 2019 to focus full-time on OpenAI as CEO.
4 min read · read answer →How Does Y Combinator Work?
YC invests $500K in each accepted startup for 7% equity, then runs a 3-month program in San Francisco focused on shipping product and finding customers. The program ends with Demo Day, where founders pitch to ~1,500 investors. After the batch, founders keep lifetime access to YC's alumni network. YC makes money by taking equity that compounds over time as portfolio companies grow.
5 min read · read answer →YC S22 Batch — Full List and Current Status
YC's Summer 2022 (S22) batch included approximately 228 companies, running from June to August 2022 with demo day in September 2022. S22 occupies a unique position in YC history — it was the last batch before the ChatGPT-driven AI wave transformed startup formation, and it was the first batch where the 2021-2022 funding correction was visibly affecting the investor landscape. Founders in S22 faced a demo day in a market where valuations were compressing, interest rates were rising, and the easy-money era of 2021 was clearly over.
10 min read · read answer →YC W22 Batch — Full List of Companies and Outcomes
YC's Winter 2022 (W22) batch included approximately 198 companies, running from January to March 2022 with demo day in April 2022. W22 sits at a historically interesting inflection point — it was the last YC batch to raise capital at the peak 2021-2022 funding multiples before the correction hit in earnest. Companies that demo'd in April 2022 were among the last cohort to benefit from investor appetite inflated by zero-interest-rate capital.
10 min read · read answer →YC S21 Batch — Companies, Valuations, and What Happened Next
YC's Summer 2021 (S21) batch was the largest in YC history with approximately 377 companies — nearly double the pre-pandemic batch size — running from June to August 2021 with demo day in September 2021. S21 was the peak of the COVID-era startup boom, with the easiest fundraising environment in YC history. Median seed rounds exceeded $4M. Companies raised at 2-3x the valuations of comparable S19 companies. Several S21 companies raised $10M+ seed rounds within days of demo day.
10 min read · read answer →All YC AI Companies — Complete Database 2025
YC has funded over 600 AI-related companies across its portfolio since 2005, with the vast majority concentrated in batches from 2019 onward and a dramatic acceleration from 2023. As of 2025, AI companies represent approximately 50-60% of each new YC batch — up from approximately 15% in 2021 and under 5% before 2019. This page provides a comprehensive sector-by-sector analysis of YC's AI portfolio, the most significant companies in each category, funding patterns, and what the complete YC AI database reveals about where the AI startup opportunity is most durable.
10 min read · read answer →All YC Fintech Companies — Complete List
YC has funded over 500 fintech companies since 2005, making financial technology one of the largest and most consistent sectors in its portfolio. YC-backed fintech companies have collectively raised over $20 billion and include some of the most valuable startups in the world — Stripe ($65B+), Brex ($12B+), Ramp ($10B+), and Mercury ($1.6B+) are all YC alumni. The YC fintech portfolio spans payments, lending, banking infrastructure, insurance, investment products, accounting, payroll, and increasingly AI-powered financial automation.
12 min read · read answer →YC W21 Batch — Complete Company List
YC's Winter 2021 (W21) batch set a record at the time with 319 companies presenting at demo day on March 23, 2021 — YC's 32nd demo day, conducted entirely virtually. The batch represented 41 countries, with 50% of companies based outside the US — the highest international proportion in YC history at that point. India was the second-largest demographic with 43 startups, another record for Indian founder representation.
8 min read · read answer →YC S20 Batch — How COVID Changed That Cohort
YC's Summer 2020 (S20) batch was the first YC batch planned and executed entirely under COVID-19 conditions from day one — unlike W20, which was disrupted mid-program. S20 ran from June to August 2020 with 198 companies presenting at a virtual demo day on August 24-25, 2020 — YC's 31st demo day. The batch represented 26 countries with 36% of companies based outside the US.
7 min read · read answer →YC W20 Batch — Company List and Notable Exits
YC's Winter 2020 (W20) batch was disrupted mid-program by the onset of COVID-19 — making it one of the most unusual batches in YC history. W20 started in January 2020 under normal in-person Bay Area conditions, then was forced to transition as the pandemic spread. Demo day was moved online and brought forward by one week to March 16, 2020 — YC's 30th demo day — making it the first-ever online YC demo day.
8 min read · read answer →YC S19 Batch — Full Company List and Current Status
YC's Summer 2019 (S19) batch included 197 companies in total, with 175 presenting at demo day on August 19-20, 2019 — YC's 29th demo day, held in-person at Pier 48 in San Francisco. The batch represented 27 countries, with 38% of companies based outside the US before joining YC. S19 is notable as the last fully "normal" large in-person summer batch before the pandemic disrupted YC's operating model starting in W20.
8 min read · read answer →YC W19 Batch — Where Are These Companies Now
YC's Winter 2019 (W19) batch included approximately 200 companies, running from January to March 2019 with demo day in March 2019 — entirely under YC's traditional pre-pandemic, in-person operating model. With over 6 years of post-batch history now available, W19 offers founders a clear "where are they now" picture: which companies became category leaders, which achieved meaningful but modest outcomes, which were acquired, and which quietly shut down.
9 min read · read answer →YC S18 Batch — Notable Companies and Outcomes
YC's Summer 2018 (S18) batch included approximately 140 companies, a notably smaller cohort than the 200+ company batches that became standard from 2019 onward. Running from June to August 2018 with demo day in August 2018, S18 operated during a period when YC was still calibrating its batch size following several years of steady growth. With over 7 years of post-batch history, S18 offers one of the most complete outcome pictures available — including IPOs, significant acquisitions, and the full spectrum of attrition.
8 min read · read answer →YC W17 Batch — Complete Company List
YC's Winter 2017 (W17) batch included 117 companies across 22 countries, running from January to March 2017 with demo day on March 20-21, 2017. The batch was notable for its international diversity — Sam Altman described the international outreach efforts as paying off significantly, with YC having visited more countries than ever before in their recruiting tour. W17 also included an unusual addition: the ACLU, a 97-year-old nonprofit, which went through YC to learn growth tactics.
13 min read · read answer →YC S16 Batch — Complete Company List
YC's Summer 2016 (S16) batch included 105 companies, running from June to August 2016 with demo day on August 22-23, 2016. The batch spanned consumer, developer tools, security, hardware, marketplaces, fintech, biotech, edtech, and nonprofits — with 30% of startups coming from outside the US, reflecting YC's expanding international recruiting. TechCrunch noted at the time that investor reactions were mixed, with some saying they saw fewer truly breakout companies immediately apparent at demo day — but the longer-term record of S16 tells a very different story.
14 min read · read answer →YC W16 Batch — Companies and Outcomes
YC's Winter 2016 (W16) batch included 125 companies, running from January to March 2016 with demo day in March 2016. W16 is one of the most outcome-rich batches in YC history relative to its size — it produced Lattice (HR software), Deepgram (speech AI), Relativity Space (3D-printed rockets), Paystack (Nigerian payments, acquired by Stripe for ~$200M), Rappi (Latin American super-app), Boom Supersonic (commercial supersonic flight), and Mux (video infrastructure), among others.
15 min read · read answer →YC W18 Batch — Full Company List and Overview
YC's Winter 2018 (W18) batch presented 141 companies at demo day on March 19-20, 2018 — the largest demo day in YC's 13-year history at that point. The batch ran from January to March 2018, fully in-person in the Bay Area, and represented a significant milestone: YC had funded 1,585 companies since 2005, with 15 alumni valued above $1B and 70+ valued above $100M at the time of the batch.
9 min read · read answer →YC S17 Batch — Legacy and Notable Alumni
YC's Summer 2017 (S17) batch presented 124 companies at demo day on August 21-22, 2017 — the largest demo day in YC's then-12.5-year history, described officially as YC's 25th Demo Day. The batch ran from June to August 2017, fully in-person in the Bay Area, at a point when YC had funded 1,430 companies and 3,500 founders since 2005, with total alumni market cap exceeding $85 billion.
10 min read · read answer →YC Application — What to Prepare Now for the Next Batch
If you are reading this in mid-2026, the Winter 2026 (W26) batch has already started — its application deadline was November 10, 2025, and the batch is running January through March 2026 with demo day in late March 2026. That window has closed. What you can act on right now is the next available batch: Summer 2026 (S26), which YC typically opens for applications in the spring with an on-time deadline in the May-July window, batch dates running June through August, and demo day in late August.
10 min read · read answer →Demo Day
1 answerStartup Ideas
6 answersYC Request for Startups 2025 — Complete Breakdown
YC's Request for Startups (RFS) is published every batch cycle and represents the clearest public signal of what YC partners want to fund. Unlike most investor thesis documents, the RFS is written by the specific partners actively making investment decisions — meaning every category listed is one where a partner is personally prepared to write a check. In 2025, YC published four separate RFS editions (Winter, Spring, Summer, and Fall), reflecting the move to four batches per year that YC introduced starting with the Fall 2024 batch.
13 min read · read answer →YC RFS AI Infrastructure — What YC Wants to Fund
AI infrastructure is one of the most consistently signaled categories across every YC RFS edition from 2024 through 2026. When YC says "AI infrastructure," they mean something specific — not foundation models (YC is realistic that competing with OpenAI, Anthropic, and Google at the model layer is not a startup-scale opportunity), but the layer of tooling, platforms, and physical infrastructure that makes AI applications faster to build, cheaper to run, more reliable in production, and safer to deploy.
12 min read · read answer →YC RFS Defense Tech — What YC Looks For
Defense technology has moved from a category YC historically avoided to one of its most explicitly prioritized RFS categories. The shift reflects both a broader change in the Silicon Valley relationship with defense contracting and a specific YC view that commercial-grade technology — AI, software, autonomous systems, and advanced sensors — has reached a capability level where startups can compete meaningfully with traditional defense primes (Lockheed Martin, Raytheon, Northrop Grumman, L3Harris) for specific program categories.
12 min read · read answer →YC RFS Developer Tools — Specific Opportunities YC Wants Founders to Build
YC's Request for Startups is the clearest public signal of where the organization wants to deploy capital. For developer tools, the current RFS (Fall 2026 and recent cycles) is more specific than most founders realize — YC is not asking for another IDE plugin or a generic API wrapper. It is asking for infrastructure that solves structural problems in how software is built, deployed, and maintained in an AI-native world. This page breaks down every developer tools opportunity YC has explicitly named, what problem each one is solving, and what a fundable application in each area needs to demonstrate.
14 min read · read answer →YC RFS Fintech Ideas 2025 — Detailed Breakdown
YC has funded more fintech companies than any sector except B2B SaaS — Stripe, Brex, Coinbase, Gusto, Mercury, Deel, and hundreds more. The fintech RFS has evolved significantly from the 2018-2022 era of "payments API and lending infrastructure" into something more specific and more ambitious. The current YC fintech thesis, reflected across Fall 2026, Summer 2025, and Winter 2025 RFS editions, centers on two converging forces: stablecoins becoming mainstream financial infrastructure, and AI agents becoming the primary actors in financial workflows.
13 min read · read answer →YC RFS Healthcare — Specific Problems YC Wants Solved
Healthcare has appeared in every YC Request for Startups edition since 2024, making it one of the most consistently prioritized sectors in YC's current investment thesis. Unlike some RFS categories that describe a broad technology direction, YC's healthcare RFS is unusually specific — naming particular workflow failures, particular cost drivers, and particular user experiences that YC partners believe are ready to be disrupted. This specificity is itself a signal: it means partners have done the research, have talked to companies in these spaces, and are ready to fund the right team.
13 min read · read answer →Go deeper
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