You asked about Reinforcement Learning
21 people built something like it. 2 are gone.
That is 10% of the ones whose fate we could settle, against 23% across the whole register. 1 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2022-01-01 | YCvoize We build the AI companion for nurses, to create time for care. · voize.de | still up |
| 2022-07-12 | pixieapp.co | still up |
| 2022-03-10 | prepform.com | still up |
| 2022-01-01 | Compliant-Ready AI for the Enterprise · dynamo.ai | still up |
| 2022-01-01 | YCLanceDB Open-source, serverless vectordb for production-scale generative AI · lancedb.com | still up |
| 2022-01-01 | YCSpade Spade is the data and AI platform for modern finance. · spade.com | still up |
| 2022-01-01 | LLM for Legal in Brazil · lexter.ai | still up |
| 2022-06-01 | YCCerrion Video AI to automatically detect and respond to production line… · cerrion.com | still up |
| 2022-06-01 | YCFini Fini | Automate 80% of enterprise support with AI agents · usefini.com | still up |
| 2022-01-01 | Rapid medical data annotation · redbrickai.com | still up |
| 2022-01-01 | YCMySivi MySivi - AI English Speaking Practice App · mysivi.ai | still up |
| 2022-06-01 | YCLamin Open data platform for traceable, multimodal AI · lamin.ai | still up |
| 2022-01-01 | YCFlike Flike's AI crafts sales emails that convert · flike.app | gone |
| 2022-01-01 | YCPloomber Heroku for AI · ploomber.io | gone |
| 2022-01-01 | YCHypaHub A Cloud-Based Bioinformatics and AI Platform · hypahub.com | acquired |
| 2022-01-01 | YCToko Learn English by speaking with an AI · tokotutor.com | still up |
| 2022-01-01 | YCStarling AI enabling digital urine diagnostics in the home · starlingmedical.com | still up |
| 2022-06-01 | YCRaven AI Assistants for Manufacturing Operations · startraven.com | still up |
| 2022-01-01 | Serverless Infrastructure Platform for AI · cerebrium.ai | still up |
| 2022-06-01 | YCTypeLess AI messaging API for smarter, faster communication. · apps.apple.com | still up |
| 2022-06-01 | Generative AI for administrative automation in healthcare · delfino.ai | still up |
How this compares
Y Combinator reports its own outcomes, including acquisitions. The other two are judged by asking the domain, so they are not measured the same way and are never averaged together.
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.