Startup Lessons

Discover and get mutual support from community founders

ReverseYC is a public record of startups that applied to Y Combinator, were rejected, and kept building. Explore evidence-backed funding, revenue, and user milestones, or submit your own story. Rejections are self-reported. Not affiliated with YC.

Fundraising prep is broken. AI can write your deck, your YC application, your email to investors. All polished. But the hardest part of fundraising is still telling the story out loud. Rehearsal Room gives founders a private space to practice before the real meeting. Five AI investor types with different styles and intensity. Ten minutes per session. Real feedback on how your story lands. Free to try. No deck needed. Just show up and tell your story. No storing of data, unless you consent.

Get partner-level feedback on your Y Combinator application. AI analyzes your startup across 9 data sources and simulates feedback from 13 YC partner personas.

Startups often fail because of timing, not ideas. Startups.RIP is a wiki of 1,700+ YC startups that shut down or got acquired. Our AI research agent writes a detailed post-mortem (what they built, why they failed, what's changed since) and a rebuild playbook with implementation-ready technical specs you can drop straight into your AI coding agent. Every failed startup is a validated market with unfinished business. Shortcut the idea maze. Start with what almost worked.