You asked about Reinforcement Learning
Nobody in the register described anything this way.
| Launched | What it was | Today |
|---|---|---|
| 2024-06-01 | YCSepal AI Data Development for Advanced AI · sepalai.com | acquired |
| 2024-01-01 | Self-improving content bank for marketing · useresonance.com | acquired |
| 2014-01-01 | YCCruise Self-driving cars. · getcruise.com | acquired |
| 2011-06-01 | The leading online learning platform for technical skills. · codecademy.com | acquired |
| 2016-06-01 | YCWorkRamp The All-in-One Learning Platform · workramp.com | acquired |
| 2019-01-01 | YCPachama Restoring nature to solve climate change. · pachama.com | acquired |
| 2015-01-01 | Data Versioning, Data Pipelines, and Data Lineage · pachyderm.com | acquired |
| 2017-06-01 | We help kids stay curious by creating better explanations. · mystery.org | acquired |
| 2015-01-01 | Paperspace is a cloud platform for building and scaling AI… · paperspace.com | acquired |
| 2012-06-01 | Acquired by Carlyle. Edtech and other technology · studyedge.com | acquired |
| 2017-06-01 | Headstart uses Machine Learning to help companies decide on who to… · headstart.io | acquired |
| 2018-06-01 | Transforms how grocery stores buy highly perishable foods. · shelfengine.com | acquired |
| 2020-06-01 | YCQuell Get fit fighting your way through a fantasy world. · playquell.com | acquired |
| 2020-01-01 | Run machine learning models in the cloud · replicate.com | acquired |
| 2021-01-01 | YCAwari Reinventing lifelong learning for the future of work. · awari.com | acquired |
| 2019-01-01 | YCAXDRAFT AXDRAFT helps corporations draft, negotiate and approve documents 10x… · axdraft.com | acquired |
| 2014-01-01 | YCTheorem The mission of Theorem is to make credit safe and available. We use… · theoremlp.com | acquired |
| 2016-06-01 | YCCrowdAI CrowdAI is the world's leading no-code platform for vision AI · crowdai.com | acquired |
| 2022-01-01 | YCHomeRoom We Rent Your Property by the Room. You earn 50% more Rent. · livehomeroom.com | acquired |
| 2015-01-01 | YCSigOpt SigOpt is an Optimization-as-a-Service platform that seamlessly tunes… · sigopt.com | acquired |
| 2019-01-01 | Talent AI improving quality of hire · searchlight.ai | acquired |
| 2020-01-01 | YCPowerX AI powered sensors that save energy, water and emissions · powerx.co | acquired |
| 2021-01-01 | A skill-tech platform that runs placement bootcamps · functionup.org | acquired |
| 2015-01-01 | YCYhat End-to-end data science lifecycle management platform. · yhat.com | acquired |
| 2016-01-01 | YCPulpix Binge-watching technology for video platforms. · pulpix.com | acquired |
| 2018-01-01 | YCEdwin Edwin is virtual English tutor - an AI-powered service for learning… · edwin.ai | acquired |
| 2020-06-01 | Humanloop is the LLM evals platform for enterprises. · humanloop.com | acquired |
| 2017-06-01 | YCEduflow Create and run collaborative online learning experiences. · eduflow.com | acquired |
| 2018-06-01 | YCPhiar We are developing a revolutionary AI-powered augmented reality… · phiar.net | acquired |
| 2020-06-01 | We help ML teams improve their models by improving their datasets · aquariumlearning.com | acquired |
| 2021-01-01 | Dramatically better search and ads for marketplaces · promoted.ai | acquired |
| 2014-01-01 | Machine Learning personalization for dynamic digital properties -… · liftigniter.com | acquired |
| 2020-01-01 | DataOps Observability Platform for Snowflake · chaosgenius.io | acquired |
| 2021-01-01 | YCPipeBio PipeBio is a SaaS bioinformatics platform to develop antibody drugs. · pipebio.com | acquired |
| 2021-01-01 | Build better computer vision models by building better datasets · segments.ai | acquired |
| 2015-01-01 | YCPomello Analytics software that helps companies measure organizational… · pomello.com | acquired |
| 2014-06-01 | YCTule Help farmers make irrigation decisions with sensors / computer vision · tuletechnologies.com | acquired |
| 2018-01-01 | Turn your data into a deployed computer vision model · jidomaps.com | acquired |
| 2022-01-01 | YCHypaHub A Cloud-Based Bioinformatics and AI Platform · hypahub.com | acquired |
| 2021-01-01 | Business intelligence on text · hyperglue.com | acquired |
| 2023-06-01 | The AI-powered risk decision platform · trycatamaran.com | acquired |
| 2021-06-01 | YCSleek Browser automation for businesses. · onsleek.com | acquired |
| 2018-01-01 | Wearables and AI to predict and prevent sepsis outside the hospital · sepsisscout.com | acquired |
| 2020-06-01 | Bandit ML builds machine learning tools for e-commerce companies. · banditml.com | acquired |
| 2025-06-01 | YCOpennote The notebook that thinks with you. · opennote.com | acquired |
| 2016-06-01 | YCNeoWize NeoWize created a new type of machine learning algorithm and uses it… · neowize.com | acquired |
| 2011-06-01 | YCVerbling Language learning through video chat. · verbling.com | acquired |
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.