You asked about AR
58 people built something like it. 7 are gone.
That is 13% of the ones whose fate we could settle, against 23% across the whole register. 4 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2021-01-01 | YCEncord The data layer for physical AI · encord.com | still up |
| 2021-02-22 | buyforlife.com | moved |
| 2021-01-01 | YCCodingal Leading online after-school for kids & teens to learn AI & coding · codingal.com | still up |
| 2021-06-01 | YCRootly AI-native on-call and incident response carefully crafted to help… · rootly.com | still up |
| 2021-08-29 | voicera.co | gone |
| 2021-01-01 | YCPopl Your AI GTM platform for In-Person Events · popl.co | still up |
| 2021-01-01 | YCTreinta Software and AI tools for SMBs in the US and Latin America · treinta.co | still up |
| 2021-01-01 | YCMindee AI Document Understanding API · mindee.com | still up |
| 2021-01-01 | Physical AI for Warehouses and Factories · fluxauto.ai | still up |
| 2021-01-01 | YCTriomics AI Agents for Oncology EHRs · triomics.com | still up |
| 2021-01-01 | YCSoraban AI tax workflow platform for accounting firms · soraban.com | still up |
| 2021-06-01 | YCSully Autonomous team of AI agents that runs the entire hospital operations · sully.ai | still up |
| 2021-09-03 | examples.jina.ai | gone |
| 2021-01-01 | YCAXAR AI Multi-agent orchestration platform · axar.ai | gone |
| 2021-06-01 | Track & Boost Your Brand’s Visibility in AI Search · writesonic.com | still up |
| 2021-10-03 | researchai.co | unverified |
| 2021-01-17 | share.streamlit.io | still up |
| 2021-01-01 | Software for medical laboratories and clinics · dashlabs.ai | still up |
| 2021-01-01 | AI-powered customer service for startups · cloudhumans.com | still up |
| 2021-01-01 | YCMoichor AI Powered Animal Diagnostics · moichor.com | still up |
| 2021-02-04 | evertrove.co | unverified |
| 2021-06-01 | The most magical personal Voice-Led AI English Learning Buddy for Kids · sparkstudio.co | still up |
| 2021-06-01 | YCMach9 AI CAD Software for Civil Engineering · mach9.ai | still up |
| 2021-01-01 | YCPer Diem The AI operating system for restaurants · tryperdiem.com | still up |
| 2021-06-01 | The fastest way to ship airtight AI · openlayer.com | still up |
| 2021-01-01 | YCDatrics Generative AI Healthcare Coding Automation · datrics.ai | still up |
| 2021-03-01 | getclockwise.com | still up |
| 2021-01-01 | YCSpokn AI-powered video platform for Internal Comms and HR teams · getspokn.com | still up |
| 2021-06-01 | YCCoLoop AI Copilot for insights & strategy · coloop.ai | still up |
| 2021-06-01 | YCFerveret Nuclear-inspired cooling that turns wasted power into more AI compute · ferveret.com | still up |
| 2021-01-01 | YCarnata AI workers for the logistics industry. · arnata.com | still up |
| 2021-07-28 | researchfin.ai | unverified |
| 2021-01-07 | uniqueaiart.com | gone~35mo |
| 2021-01-01 | Dramatically better search and ads for marketplaces · promoted.ai | acquired |
| 2021-06-01 | YCEpsilon3 AI-Powered ERP, MES, and Test Software for Complex Operations · epsilon3.io | still up |
| 2021-06-01 | Plan and review AI generated code · vibekanban.com | still up |
| 2021-06-01 | YCVaros AI Business Analysts to gather requirements and optimize processes · varos.com | still up |
| 2021-06-01 | YCSafeBeat First ECG AI to go beyond diagnostics and recommend treatment · safebeat.com | still up |
| 2021-09-08 | artbyanai.com | unverified |
| 2021-01-01 | YCRoutine AI-native all-in-one workspace for startups · routine.co | still up |
| 2021-01-01 | AI workers that book, scribe, code, interpret, and answer clinicians · rejoyhealth.com | still up |
| 2021-01-01 | YCunSurvey AI-led market research interviews, no scheduling, instant insights. · unsurvey.ai | acquired |
| 2021-01-01 | YCBiodock Cloud AI microscopy automation · biodock.ai | still up |
| 2021-01-01 | Build better computer vision models by building better datasets · segments.ai | acquired |
| 2021-06-01 | YCPotion AI for product formulation · potion.ai | still up |
| 2021-08-03 | attractivenesstest.com | still up |
| 2021-06-01 | AI-designed Affinity Reagents · medium.bio | still up |
| 2021-06-01 | YCStardex AI native ATS + CRM for executive search firms · stardex.com | still up |
| 2021-06-01 | Building Gong.io for offline retail. · outloud.ai | gone |
| 2021-01-01 | YCVenu AI Meet qualified leads in person by automating conference production · venu3d.com | still up |
| 2021-06-01 | YCRivia.AI Interactive Product Demos · rivia.ai | still up |
| 2021-06-01 | Computer vision that makes the industrial workplace, safer · protex.ai | still up |
| 2021-06-01 | AI-powered equity research software · hudson-labs.com | still up |
| 2021-12-25 | roboholiday.com | unverified |
| 2021-10-15 | blogaudio.co | still up |
| 2021-05-01 | namebatao.com | gone |
| 2021-06-01 | The complete production quality platform. AI-powered E2E testing,… · artillery.io | still up |
| 2021-01-01 | YCFriz AI Social Media Manager · usefriz.com | acquired |
| 2021-01-01 | YCClear The unbiased AI and data layer for skin health. · getclearapp.com | still up |
| 2021-06-01 | Open-source monitoring for machine learning models · evidentlyai.com | 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.