You asked about Reinforcement Learning
68 people built something like it. 68 are gone.
That is 100% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2016-01-01 | YCPathmind Pathmind helps industrial engineers and simulation modelers achieve… · pathmind.com | gone |
| 2025-09-01 | YCSylvian Specialized AI Agents. · sylvian.ai | gone |
| 2025-06-01 | YCNuntius Making Models Follow Rules. · nuntius.ai | gone |
| 2022-04-12 | damnnnn.com | gone |
| 2022-05-10 | getindx.com | gone |
| 2022-01-01 | YCAntWalk An employee up-skilling platform for fast growing companies · antwalk.com | gone |
| 2022-12-30 | distilhn.com | gone |
| 2018-01-01 | Engineering next-generation, brain-penetrant cancer therapies. · reverielabs.com | gone |
| 2021-06-01 | YCAkudo India's first learning-focused neobank for teenagers · akudo.in | gone |
| 2022-08-04 | app.learningloop.org | gone |
| 2021-01-01 | Embed NL-to-SQL into your Product 📈 · dataherald.com | gone |
| 2021-01-01 | YCInvoid Create identity verification workflows the way you want · invoid.co | gone |
| 2021-01-31 | hacker-ai.com | gone~60mo |
| 2021-01-01 | YCMystic Low latency API to run and deploy ML models · mystic.ai | gone |
| 2020-01-01 | YCSprintAI AI-led platform for inventory and fulfillment optimization · getsprint.ai | gone |
| 2024-01-01 | Open-source humanoid robots · kscale.dev | gone |
| 2021-06-01 | YCKurios Cohort-based online courses for professionals in Latin America · kurios.la | gone |
| 2019-01-01 | AI-powered corporate learning for accelerated employee growth & skill… · tailor-ed.com | gone |
| 2021-03-02 | blog.repl.it | gone~8mo |
| 2015-01-01 | Buid, test and deploy perception applications · standardcyborg.com | gone |
| 2023-01-01 | The TikTok style corporate training platform · goodcourse.co | gone |
| 2022-01-01 | YCFlike Flike's AI crafts sales emails that convert · flike.app | gone |
| 2023-04-28 | sotai.ai | gone |
| 2020-01-01 | We generate synthetic data for computer vision models. · zumolabs.ai | gone |
| 2022-01-01 | YCPloomber Heroku for AI · ploomber.io | gone |
| 2021-06-01 | YCSpoken Never overpay online · spoken.io | gone |
| 2019-01-01 | Large Scale Genomic Data Mining Software · spiralgenetics.com | gone |
| 2017-01-01 | YCEntry Biometric sign in and identity verification platform · getentry.com | gone |
| 2023-01-01 | YCLuca The Modern Pricing Engine for Retail · askluca.com | gone |
| 2018-01-01 | YCVathys Accelerating machine learning through software · vathys.ai | gone |
| 2021-10-05 | odysseyapp.co.nz | gone |
| 2022-01-01 | Promotion management platform · cherry.ai | gone |
| 2021-01-01 | Synthetic data for better vision. · sbxrobotics.com | gone |
| 2020-06-01 | The "Shopify" for Online Schools · tryvirtually.com | gone |
| 2022-08-05 | pledu.co | gone |
| 2021-06-01 | Building Gong.io for offline retail. · outloud.ai | gone |
| 2021-01-01 | YCPrendea Live afterschool classes for Spanish-speaking kids ages 4 to 15. · prendea.com | gone |
| 2021-11-04 | lazywords.com | gone |
| 2019-06-01 | Hearing aids that work in noisy places, like restaurants, using ML. · audiofocus.io | gone |
| 2017-01-01 | YCFloydHub ML Platform for developing, training and deploying ML models · floydhub.com | gone |
| 2022-06-01 | YCCAPSULE Buy anything you find on social media · shopcapsule.ai | gone |
| 2020-06-01 | Demand Forecasting as a Service · intelligent.services | gone |
| 2021-01-01 | Breaking new ground in online eyecare. · quadranteye.com | gone |
| 2020-01-01 | Create active, collaborative learning experiences · clayboard.com | gone |
| 2021-01-01 | We teach Filipinos to become remote software engineers globally. · avionschool.com | gone |
| 2020-01-01 | YCOrbiter ML models automatically monitor business performance · getorbiter.com | gone |
| 2019-06-01 | Turn any website into an API · dashblock.com | gone |
| 2023-01-01 | AI for drug formulation · lavo.ai | gone |
| 2012-01-01 | YCMarft Marft creates embeddable machine learning models for application… · marft.com | gone |
| 2021-06-01 | YCBuzzle Automatic voice-of-customer trends & metrics from sales conversations. · buzzle.ai | gone |
| 2014-01-01 | Mobile keyboards + emoji + deep learning. We make Dango. We also made… · getdango.com | gone |
| 2021-06-01 | Observability for Data Engineering Teams · lariatdata.com | gone |
| 2024-01-01 | YCPreloop Translate your experimental scripts into production ML services · preloop.com | gone |
| 2022-01-01 | YCLifecast Software to create 3D video for VR, robotics and film. · lifecastvr.com | gone |
| 2013-06-01 | YCCrowdery [Now Clara, YC S14- claralabs.com] · crowdery.com | gone |
| 2024-09-01 | AI Co-Pilot for Design · supercontrast.com | gone |
| 2024-09-01 | Pushing the boundaries of AI · zeroframe.ai | gone |
| 2021-01-01 | Create video testimonials with a link · milkvideo.com | gone |
| 2019-06-01 | YCTensil We turn machine learning models into custom hardware. · tensil.ai | gone |
| 2019-01-01 | YCBasilica Basilica is an API that embeds high-dimensional data like images and… · basilica.ai | gone |
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.