You asked about Reinforcement Learning
45 people built something like it. 6 are gone.
That is 14% of the ones whose fate we could settle, against 23% across the whole register. 2 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 |
| 2022-01-01 | YCGoJom One-stop-shop for Real Estate Solutions. · gojom.com | still up |
| 2022-01-01 | YCAntWalk An employee up-skilling platform for fast growing companies · antwalk.com | gone |
| 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 | YCInvert Data analytics software for biomanufacturing. · invertbio.com | still up |
| 2022-06-01 | General Autonomy for Industrial Vehicles · polymathrobotics.com | still up |
| 2022-01-01 | YCHomeRoom We Rent Your Property by the Room. You earn 50% more Rent. · livehomeroom.com | acquired |
| 2022-01-01 | YCPINA WealthFront of Indonesia · pina.id | still up |
| 2022-01-01 | Intelligent Process Automation for Lending. · fintelite.ai | still up |
| 2022-01-01 | LLM for Legal in Brazil · lexter.ai | still up |
| 2022-01-01 | YCMomento Building a full-stack auto insurer for the underserved in LatAm · tumomento.com | still up |
| 2022-06-01 | YCCerrion Video AI to automatically detect and respond to production line… · cerrion.com | still up |
| 2022-01-01 | YCAxis Knowledge base for corporate affairs teams · axis.xyz | still up |
| 2022-06-01 | Ironclad for construction · provision.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 |
| 2022-06-01 | YCLamin Open data platform for traceable, multimodal AI · lamin.ai | still up |
| 2022-06-01 | Programming courses for experienced engineers · codecrafters.io | still up |
| 2022-06-01 | We recycle plastic using engineered enzymes · birchbiosciences.com | still up |
| 2022-01-01 | An intelligent, visual knowledge base for learning complex topics. · heptabase.com | still up |
| 2022-01-01 | YCRTHM Self-learning care for complex illness · rthm.com | still up |
| 2022-01-01 | YCMySivi MySivi - AI English Speaking Practice App · mysivi.ai | still up |
| 2022-01-01 | YCFlike Flike's AI crafts sales emails that convert · flike.app | gone |
| 2022-01-01 | 10x-1000x faster compute for Neural Network training · strongcompute.com | still up |
| 2022-01-01 | YCBobidi Restaurant Loyalty Using Quiz · upswell.ai | still up |
| 2022-01-01 | YCPloomber Heroku for AI · ploomber.io | gone |
| 2022-01-01 | Promotion management platform · cherry.ai | gone |
| 2022-01-01 | YCHypaHub A Cloud-Based Bioinformatics and AI Platform · hypahub.com | acquired |
| 2022-06-01 | YCNuMind Create custom NLP models · numind.ai | still up |
| 2022-01-01 | YCStarling AI enabling digital urine diagnostics in the home · starlingmedical.com | still up |
| 2022-01-01 | YCDarsel Chatbot teaching K12 math in developing countries · darsel.tech | still up |
| 2022-01-01 | YCToko Learn English by speaking with an AI · tokotutor.com | still up |
| 2022-06-01 | Consumer Optimized Insurance · coveragecat.com | still up |
| 2022-01-01 | Serverless Infrastructure Platform for AI · cerebrium.ai | still up |
| 2022-06-01 | YCCAPSULE Buy anything you find on social media · shopcapsule.ai | gone |
| 2022-06-01 | YCRaven AI Assistants for Manufacturing Operations · startraven.com | still up |
| 2022-01-01 | YCNyckel Classify Anything · nyckel.com | still up |
| 2022-01-01 | API for shared embeddable web browsers · hyperbeam.com | still up |
| 2022-01-01 | YCTrellus Real-time sales coach for SDRs · trellus.ai | still up |
| 2022-06-01 | A search technology that actually finds what you’re looking for. · search-artemis.com | 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 |
| 2022-01-01 | YCLifecast Software to create 3D video for VR, robotics and film. · lifecastvr.com | gone |
How this compares
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.