You asked about AR
Nobody in the register described anything this way.
| Launched | What it was | Today |
|---|---|---|
| 2021-06-01 | YCMailmodo No-code email marketing platform to send forms & widgets within emails · mailmodo.com | acquired |
| 2021-01-01 | YCAwari Reinventing lifelong learning for the future of work. · awari.com | acquired |
| 2021-01-01 | YCUiflow No-code platform for enterprise software companies · ycombinator.com | acquired |
| 2021-01-01 | A skill-tech platform that runs placement bootcamps · functionup.org | acquired |
| 2021-06-01 | YCInflow A self-help app for people to manage their ADHD. · getinflow.io | acquired |
| 2021-01-01 | Digital Sales Rooms (Acquired by MindTickle) · enableus.com | acquired |
| 2021-01-01 | Dramatically better search and ads for marketplaces · promoted.ai | acquired |
| 2021-01-01 | YCTaoFi The financial layer for decentralized AI · taofi.com | acquired |
| 2021-01-01 | Electricity price forecasts for energy storage, ev charging, etc. · inbalanceresearch.com | acquired |
| 2021-01-01 | YCPipeBio PipeBio is a SaaS bioinformatics platform to develop antibody drugs. · pipebio.com | acquired |
| 2021-06-01 | YCArengu Build frictionless signup flows in minutes · arengu.com | acquired |
| 2021-06-01 | YCTarsal Data pipeline for your security data lake. · tarsal.co | acquired |
| 2021-06-01 | Direct Ordering Software for Restaurants · tablevibe.co | acquired |
| 2021-01-01 | Supercharge your mobile apps · emergetools.com | acquired |
| 2021-01-01 | Helping food brands and retailers reduce food wastage · fountain9.com | acquired |
| 2021-01-01 | YCunSurvey AI-led market research interviews, no scheduling, instant insights. · unsurvey.ai | acquired |
| 2021-01-01 | Build better computer vision models by building better datasets · segments.ai | acquired |
| 2021-01-01 | Tasty and scalable cultivated meat at price parity · orbillion.com | acquired |
| 2021-06-01 | YCMable First personalized migraine clinic using genetics and telehealth. · trymable.com | acquired |
| 2021-06-01 | YCGamerPay We are the marketplace for trading gaming skins & assets without scams · gamerpay.gg | acquired |
| 2021-01-01 | YCFurmacy Digital e-prescribing software for veterinarians. · furmacy.com | acquired |
| 2021-06-01 | YCLaudable App for B2B companies to find customer stories and advocates · laudable.com | acquired |
| 2021-06-01 | YCHilos Close and activate your customers on WhatsApp · hilos.io | acquired |
| 2021-06-01 | YCSleek Browser automation for businesses. · onsleek.com | acquired |
| 2021-06-01 | YCMaroo CRM for creatives (acquired by Helium Ventures) · maroo.us | acquired |
| 2021-06-01 | A modern platform for content marketing & SEO. · positional.com | acquired |
| 2021-01-01 | Open source continuous profiling software to debug performance issues · pyroscope.io | acquired |
| 2021-01-01 | Business intelligence on text · hyperglue.com | acquired |
| 2021-01-01 | YCFlok End to end company retreat planning · goflok.com | acquired |
| 2021-01-01 | YCClipDrop Turn regular mobile photos into professional product visuals · clipdrop.co | acquired |
| 2021-06-01 | YCNasdisc A marketplace for vinyl, cassettes and cds · nasdisc.com | acquired |
| 2021-01-01 | YCFriz AI Social Media Manager · usefriz.com | acquired |
| 2021-06-01 | YCVogent Build Voice AI Agents · vogent.ai | acquired |
| 2021-06-01 | Nonprofit telehealth coaches for underserved Americans on Medicaid · veranohealth.org | acquired |
| 2021-06-01 | YCWarrant Authorization and access control as a service. · warrant.dev | acquired |
| 2021-01-01 | Building robots to automate commercial concrete construction. · rointech.com | acquired |
| 2021-01-01 | Open source mobile marketing platform. Alternative to appcues /… · laudspeaker.com | acquired |
| 2021-06-01 | YCMentum AI-Powered Assistant for Procurement and Strategic Sourcing · getmentum.com | acquired |
| 2021-01-01 | The network where sales teams connect to share customer introductions. · partnered.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.