Rejected. Built anyway.

The Database

1. 01.

   Airbnb

   YC · W09Marketplace· rejected by 7 of 7 angel investors (2008) · 2008

   Airbnb sent the same email to 7 angels. 5 ignored it, 2 said no. The full rejection thread is public.

   At rejection (2008)

   $200 in the bank, selling Obama O's cereal to survive

   Today

   Public — ~$85B market cap

   why no:'Market potential not large enough.' Investors thought renting air mattresses was a joke.

   48-hr reaction:Brian Chesky published the rejection emails on his blog in 2015. The screenshots are still up. The founders pivoted to selling political cereal to keep the lights on ($30k from Obama O's and Cap'n McCain's).

   6-month pivot:PG accepted them into YC W09 specifically because of the cereal hustle.

   outcome:IPO 2020 at $47B. One of the largest hospitality platforms on Earth.

   lesson:Angel rejection is signal about the angel, not the company. Document everything.

   sources:Brian Chesky — '7 Rejections' ↗
2. 02.

   Stripe

   YC · S10Fintech· rejected by Multiple US banks pre-2010 · 2010

   Every major US bank told the Collison brothers no before YC S10. Banks called 'seven lines of code to accept payments' impossible.

   At rejection (2010)

   Two Irish brothers with a checkout API and no banking partner

   Today

   Last private valuation $91.5B (2025 tender)

   why no:Underwriters wouldn't onboard a startup founded by 20-year-olds with no fintech background.

   48-hr reaction:Patrick moved to SF and cold-walked into banks. John kept writing the API spec.

   6-month pivot:Got a sponsor bank through a friend-of-friend intro. Got into YC S10. Within 18 months had Lyft, Shopify, Postmates as customers.

   outcome:$91.5B valuation. Processed $1.4T in 2024.

   lesson:'No one will partner with you' is sometimes literally true — until you find the one yes.

   sources:Stripe on YC ↗
3. 03.

   Dropbox

   YC · S07Cloud Storage· rejected by PG initially told Drew to find a co-founder · 2007

   Drew Houston applied to YC S07 alone. PG said no — solo founders don't get in. Drew found Arash Ferdowsi in 2 weeks and reapplied.

   At rejection (2007)

   Drew applied to YC S07 as a solo founder with a working prototype.

   Today

   Public — ~$8B market cap

   why no:YC's rule in 2007: no solo founders. Drew had no co-founder, no team, just a demo.

   48-hr reaction:Drew met Arash through a mutual MIT contact, convinced him to drop out of MIT, and resubmitted the application within weeks.

   6-month pivot:Recorded the famous Dropbox demo video for the HN crowd in 2008 — waitlist jumped from 5k to 75k overnight.

   outcome:IPO'd 2018. 700M+ registered users.

   lesson:A rejection that comes with a specific reason ('find a co-founder') is a checklist, not a no.

   sources:Dropbox on YC ↗
4. 04.

   Twitch (then Justin.tv)

   YC · W07Live Video· rejected by Investors told them to shut down · 2010

   Justin.tv was a YC company that flatlined. They quietly built a 'gaming' subdirectory that ate the whole company.

   At rejection (2010)

   Justin.tv had ~30k users and no revenue model after 2 years

   Today

   Acquired by Amazon for $970M (2014)

   why no:VCs in 2010 said 'live streaming has no business model' and 'nobody wants to watch other people play video games.'

   48-hr reaction:Emmett Shear noticed gaming was 5% of users but 25% of watch-hours. Kept it as a side experiment for 18 months.

   6-month pivot:Spun out Twitch.tv as a separate brand in 2011. Killed Justin.tv entirely in 2014.

   outcome:Twitch is now the default platform for live gaming with 35M+ DAU. Emmett went on to lead YC.

   lesson:The thing that saves you is often the side experiment you almost killed.

   sources:Amazon acquires Twitch (NYT) ↗
5. 05.

   Reddit

   YC · S05Social· rejected by PG rejected their first idea (MyMobileMenu) · 2005

   Reddit's founders were rejected from YC's first batch with their original idea. PG called them back the next day with a different idea: 'build the front page of the internet.'

   At rejection (2005)

   Two UVA students who applied to YC's first batch (S05) with a food-ordering SMS app

   Today

   Public — ~$30B market cap (2025)

   why no:PG didn't believe the SMS food-ordering pitch (MyMobileMenu). The founders themselves were strong; the idea wasn't.

   48-hr reaction:Steve and Alexis got on a train back to Virginia, demoralized. PG called and said 'come back, build something else.'

   6-month pivot:PG essentially gave them the Reddit idea on a napkin. They built it in 3 weeks. Launched June 2005.

   outcome:Acquired by Condé Nast in 2006, spun back out, IPO'd in 2024 at ~$6.4B and grew to ~$30B.

   lesson:Sometimes the rejection is of the idea, not you. Stay in the room — they may hand you the better idea.

   sources:PG on Reddit's founding ↗
6. 06.

   Coinbase

   YC · S12Fintech / Crypto· rejected by Original co-founder Ben Reeves was rejected from YC S12 partner interview · 2012

   Coinbase nearly didn't make it into YC S12 — Brian Armstrong's original co-founder was rejected mid-interview. Brian went solo into the batch.

   At rejection (2012)

   Brian's original co-founder Ben Reeves did not pass the partner interview. Brian almost lost his YC spot.

   Today

   Public — ~$70B market cap (2025)

   why no:PG's team had concerns about the co-founder match. They told Brian he could come without him or not at all.

   48-hr reaction:Brian made the call to enter YC solo. Met Fred Ehrsam (Goldman Sachs trader) during the batch through Olympics events in SF.

   6-month pivot:Fred joined as co-founder mid-batch. Coinbase launched the buy/sell flow in Oct 2012, mid-YC.

   outcome:Direct listing on Nasdaq 2021 at ~$86B. Still the largest US crypto exchange.

   lesson:Painful co-founder calls inside YC are normal. The batch is the forge — not everyone walks out with who they walked in with.

   sources:Coinbase on YC ↗
7. 07.

   Brex

   YC · W17Fintech· rejected by VR pivot abandoned mid-batch · 2017

   Henrique and Pedro killed their VR startup inside YC. They pivoted to corporate cards mid-batch.

   At rejection (2017)

   Two Brazilian YC founders whose VR startup (Beyond) had just failed

   Today

   $12.3B (2022)

   why no:VR had no traction. Investors who had passed on Beyond weren't going to take a second meeting.

   48-hr reaction:Spent 6 weeks of W17 cold-calling underwriters who would issue a corporate card to a no-collateral startup.

   6-month pivot:Found one sponsor bank willing to issue based on cash-in-bank instead of credit history.

   outcome:Raised at $12.3B in 2022. Serves 1/3 of YC's portfolio.

   lesson:A pivot inside the program is not failure. The mid-batch pivot often outperforms the original idea.

   sources:Brex on YC ↗
8. 08.

   Instacart

   YC · S12Marketplace· rejected by 20+ failed startup attempts before; late YC application · 2012

   Apoorva failed at 20 startups before Instacart. He applied to YC S12 after the deadline. He got in by delivering PG a six-pack via his own app.

   At rejection (2012)

   Apoorva applied to YC S12 LATE — past the deadline

   Today

   Public 2023 IPO, ~$10B market cap

   why no:Late application. No technical co-founder. Crowded delivery space (Webvan's $1.2B failure still loomed).

   48-hr reaction:Used his own app to deliver a six-pack to PG in person. PG accepted the late application on the spot.

   6-month pivot:Stayed solo-founder through Demo Day. Hit $100k/week GMV within 90 days of YC.

   outcome:IPO'd 2023. #1 grocery delivery platform in North America.

   lesson:Rules at YC are heuristics, not laws. Demonstrating the product > filling out the form.

   sources:Instacart on YC ↗
9. 09.

   Zapier

   YC · S12SaaS / Automation· rejected by First YC application rejected (S11) · 2011

   Zapier's first YC application was rejected. They shipped a working product, applied again to S12 with paying users, and got in.

   At rejection (2011)

   Three engineers in Columbia, Missouri building integrations on nights and weekends.

   Today

   $5B (2021 secondary)

   why no:First app showed an idea with no traction. YC partners weren't convinced 'connect apps together' was big.

   48-hr reaction:Wade, Bryan, and Mike stayed in Missouri, kept their day jobs, and shipped Zapier v1 publicly. Got first paying customers within months.

   6-month pivot:Reapplied with revenue + active users in S12. Moved to Mountain View for the batch.

   outcome:$5B secondary in 2021. Profitable, bootstrapped-style growth — barely raised after Series A.

   lesson:A YC 'no' the first time is a brief. Build what they said was missing and reapply.

   sources:Zapier on YC ↗
10. 10.

    Segment

    YC · S11Developer Tools· rejected by Their original product (ClassMetric) was rejected by users · 2011

    Segment entered YC S11 with a classroom analytics tool. It failed. They open-sourced a tiny internal library called analytics.js — that became the company.

    At rejection (2011)

    Inside YC S11 with ClassMetric — a classroom analytics tool nobody wanted.

    Today

    Acquired by Twilio for $3.2B (2020)

    why no:Professors didn't engage with ClassMetric. Pivoted to a co-founder bet on the developer tool they'd built for themselves.

    48-hr reaction:Peter Reinhardt posted analytics.js on Hacker News. The HN thread (Dec 2012) hit #1. That single post created the company.

    6-month pivot:Pivoted Segment into a unified customer data API. Hit $1M ARR in 12 months post-launch.

    outcome:Acquired by Twilio for $3.2B in 2020. Still the default customer-data platform for thousands of startups.

    lesson:Ship the tool you built for yourselves. The HN front page is a real distribution channel.

    sources:Segment on YC ↗
11. 11.

    DoorDash

    YC · S13Marketplace· rejected by Late entrant — Postmates, Caviar, Grubhub already funded · 2013

    DoorDash entered a 'finished' market in 2013 — every food delivery thesis was already funded. They drove the deliveries themselves.

    At rejection (2013)

    4 Stanford students. Delivered orders themselves for the first 6 months.

    Today

    Public — ~$70B market cap (2025)

    why no:Late entrant. Postmates, Caviar, Grubhub, Seamless all funded. 'There's no room.'

    48-hr reaction:Founders personally delivered orders in Palo Alto for the first 6 months — collected data on every restaurant.

    6-month pivot:Suburban-first strategy: while competitors fought over SF/NYC, DoorDash dominated 2nd/3rd-tier markets nobody else served.

    outcome:IPO'd Dec 2020 at ~$72B. ~50% US food delivery market share.

    lesson:Late to the city often means first to the suburbs. The crowded market is only crowded in one geography.

    sources:DoorDash S-1 filing ↗
12. 12.

    Gusto (then ZenPayroll)

    YC · W12Fintech / HR· rejected by Investors said 'payroll is solved' by ADP/Paychex · 2012

    Gusto entered YC W12 as ZenPayroll. Every investor told them payroll was already won by ADP. They went after it anyway.

    At rejection (2012)

    YC W12. Trying to displace 70-year-old payroll incumbents with no SMB customers yet.

    Today

    $9.5B (2021)

    why no:Payroll has brutal compliance + state-by-state tax complexity. Most VCs assumed it was a dead category.

    48-hr reaction:Joshua and team spent W12 talking to small business owners directly — discovered nobody actually liked their payroll provider.

    6-month pivot:Rebranded ZenPayroll → Gusto in 2015 to signal expansion into benefits + HR + onboarding.

    outcome:$9.5B valuation in 2021. 300k+ SMB customers. Still private and growing.

    lesson:'The category is solved' usually means 'the incumbent has milked it for 30 years and is hated.' That's an opening.

    sources:Gusto on YC ↗
13. 13.

    Razorpay

    YC · W15Fintech· rejected by 100+ Indian banks refused to partner · 2014

    Razorpay's founders pitched to 100+ Indian banks before one said yes. They got into YC W15 with the partnership still unsigned.

    At rejection (2014)

    Two IIT graduates with a payments API. No bank in India would talk to them.

    Today

    $7.5B (2021)

    why no:Indian regulators required a sponsor bank, and banks didn't onboard startups. Founders were too young, no track record.

    48-hr reaction:Harshil camped in bank lobbies for weeks. Wrote technical specs the bank's own engineers couldn't write themselves.

    6-month pivot:Got into YC W15 mid-pursuit. The YC badge unlocked the conversation with HDFC the founders had been chasing for 8 months.

    outcome:$7.5B valuation in 2021. Processes more digital payments in India than most banks.

    lesson:Geographic regulatory walls are real moats once you climb them. YC's credibility opens doors local credibility cannot.

    sources:Razorpay on YC ↗
14. 14.

    Cruise

    YC · W14Autonomous Vehicles· rejected by Auto industry insiders said self-driving retrofits were impossible · 2014

    Cruise entered YC W14 trying to retrofit autonomy onto regular cars. The industry called it impossible. GM bought them 2 years later.

    At rejection (2014)

    YC W14. Original product was an aftermarket kit bolted to existing cars.

    Today

    Acquired by GM for ~$1B (2016); valued at $30B in 2021

    why no:Auto OEMs said safety + liability made retrofit autonomy a non-starter. Most YC partners hadn't backed a hardware-heavy AV company before.

    48-hr reaction:Kyle (also a Twitch co-founder) and Daniel raised a small seed inside YC and shipped the retrofit kit to a few Audi A4 owners.

    6-month pivot:Abandoned retrofit, built a full software stack on GM's Bolt EV after the acquisition discussions began.

    outcome:Acquired by GM in 2016 for ~$1B. Valued at $30B in 2021.

    lesson:The wrong product can still be the right team. The market told them what to build by buying them.

    sources:Cruise on YC ↗
15. 15.

    Heroku

    YC · W08Developer Tools· rejected by Most VCs said hosting was a commodity · 2008

    Heroku entered YC W08 as a browser-based Ruby IDE. Nobody wanted that. They became a PaaS instead and Salesforce bought them.

    At rejection (2008)

    YC W08. Pre-AWS-everywhere. Pitched as 'a browser-based Ruby IDE.'

    Today

    Acquired by Salesforce for $212M (2010)

    why no:The IDE-in-browser pitch confused everyone. Investors said developers don't code in the browser.

    48-hr reaction:Realized the deploy-from-git step they'd built for the IDE was the only feature anyone used. Cut everything else.

    6-month pivot:Repositioned as 'git push heroku master' deploys. The simplest cloud deploy on Earth in 2009.

    outcome:Acquired by Salesforce in 2010 for $212M. Powered millions of apps. Set the API standard for PaaS.

    lesson:Sometimes the feature your users love is buried inside a product they hate. Cut everything else.

    sources:Heroku on YC ↗
16. 16.

    Flexport

    YC · W14Logistics· rejected by Logistics VCs said freight was 'unfixable' · 2014

    Flexport pitched 'software for freight forwarders' at YC W14. Every logistics insider said the industry would never digitize. Ryan kept going.

    At rejection (2014)

    YC W14. Trying to digitize ocean freight forwarding — a 100-year-old paper-based industry.

    Today

    $8B (2022)

    why no:Forwarders were incumbent-protected by relationships, paper contracts, and brokerage licenses. 'Software founders don't understand shipping.'

    48-hr reaction:Ryan got his US customs brokerage license himself — a multi-month exam — so the company couldn't be dismissed as 'just software.'

    6-month pivot:Built tooling alongside actually operating as a forwarder. Hit $1B GMV in 4 years.

    outcome:$8B valuation in 2022. Still the largest software-native freight forwarder.

    lesson:If the industry says you don't understand it, go get the certification they hide behind.

    sources:Flexport on YC ↗
17. 17.

    Optimizely

    YC · W10Marketing / SaaS· rejected by Original idea (Carrot Sticks educational gaming) failed · 2010

    Optimizely's founders entered YC W10 with an education game. They killed it mid-batch and pivoted to A/B testing — the tool they'd built for the Obama 2008 campaign.

    At rejection (2010)

    YC W10. Started building an education game, abandoned it inside the batch.

    Today

    Acquired by Episerver for ~$650M (2020)

    why no:Carrot Sticks (the original education game) had no growth signal. Dan had previously built A/B testing internally for the Obama campaign.

    48-hr reaction:Pete and Dan rebuilt the campaign's internal tool as a standalone SaaS in the last weeks of the batch.

    6-month pivot:Launched Optimizely at YC Demo Day W10 as 'A/B testing for everyone.' Hit $1M ARR in year one.

    outcome:Acquired by Episerver for ~$650M in 2020. Still a category leader in experimentation.

    lesson:The internal tool from your last gig is usually a startup. Mid-batch pivots are normal at YC — partners expect them.

    sources:Optimizely on YC ↗