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#04 · Core Databases

YC Startup Ideas: Application Idea vs Final Company

See how far successful YC companies moved from the idea they first described to the product customers ultimately wanted.

The gap between the YC application idea and the public company — mapped for 500+ companies. Proof that nobody starts with the right idea.

View free sample →Free preview · Full database with Pro

Live sample · source linked · no signup

Three companies tracked across their idea evolution

These source records anchor each company and batch. Pro connects the original application idea, later product, inflection point, and outcome.

CompanyBatchCategoryPublic recordSource
RedditS05Consumer / SocialIPO 2024 (NYSE: RDDT). First-batch company.Verify ↗
GustoW12Payroll / HROriginally ZenPayroll. ~$10B valuation.Verify ↗
Justin.tv / TwitchW07Consumer / VideoAcquired by Amazon for $970M (2014).Verify ↗

3 representative records · Full analysis and complete dataset in Pro

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What's inside

  • · Structured rows — searchable, filterable, exportable
  • · Source link on every entry — verifiable in one click
  • · Founder, batch, category and outcome tagging
  • · Updated as new public information emerges
  • · Web-readable + PDF download
  • · Complete database included with YC Insights Pro

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FAQ

What can I learn from this free YC startup ideas before and after sample?
These source records anchor each company and batch. Pro connects the original application idea, later product, inflection point, and outcome. The sample rows are live, source-linked records you can verify without signing up.
What is the YC Idea Evolution Database?
The gap between the YC application idea and the public company — mapped for 500+ companies. Proof that nobody starts with the right idea. It's part of the YC Insights database — the largest open library of Y Combinator learnings, built entirely from publicly available essays, batch pages, founder interviews and S-1 filings.
Who is the YC Idea Evolution Database for?
Founders, operators and investors who want a structured view of the core databases side of the YC ecosystem. Whether you're applying to YC, picking an idea, or studying what's worked, this database compresses hundreds of hours of public research into one place.
Where does the data come from?
Everything is sourced from publicly available material: YC's own website, batch pages, founder interviews, partner talks, S-1 filings, and long-form podcasts. Every claim is linkable to a public source — no insider data, no leaks.
How do I access the full YC Idea Evolution Database?
The live sample is available on this page with no signup. YC Insights Pro members get the complete searchable database, every source link, filters, and future updates for $19/month or $190/year.
Is YC Insights affiliated with Y Combinator?
No. YC Insights is an independent research project. We are not affiliated with, endorsed by, or sponsored by Y Combinator. Everything we publish is built from publicly available Y Combinator material with sources linked.
What else is in the YC Insights database?
46 databases in total across founder origins, pivots, first-1000-customer stories, batch packs, vertical packs, deep reports and master playbooks. Browse them all at /database.

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YC Insights is an independent resource. Not affiliated with or endorsed by Y Combinator. Built from publicly available material.