You asked about AI
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 | YCFinley Streamline your debt capital raise and management · finleycms.com | acquired |
| 2021-06-01 | YCinai Segment for global payments · inai.io | 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 | YCPipeBio PipeBio is a SaaS bioinformatics platform to develop antibody drugs. · pipebio.com | acquired |
| 2021-01-01 | YCJourney No code platform for sales to tell better stories and win more deals. · journey.io | acquired |
| 2021-06-01 | Direct Ordering Software for Restaurants · tablevibe.co | acquired |
| 2021-01-01 | YCMono Plaid for Africa, but better. · mono.co | acquired |
| 2021-06-01 | AI-Powered Business Development for Scientific Organizations · firstignite.com | acquired |
| 2021-01-01 | YCunSurvey AI-led market research interviews, no scheduling, instant insights. · unsurvey.ai | acquired |
| 2021-01-01 | Helping food brands and retailers reduce food wastage · fountain9.com | acquired |
| 2021-01-01 | Build better computer vision models by building better datasets · segments.ai | acquired |
| 2021-06-01 | YCMable First personalized migraine clinic using genetics and telehealth. · trymable.com | acquired |
| 2021-06-01 | YCSatsuma Reliable blockchain indexing & querying for web3 engineering teams. · satsuma.xyz | acquired |
| 2021-06-01 | Increasing restaurant profitability through our AI Operating System · bytekitchen.io | acquired |
| 2021-01-01 | YCFriz AI Social Media Manager · usefriz.com | acquired |
| 2021-01-01 | YCStacksi Automated Answers to Security Questionnaires · stacksi.com | acquired |
| 2021-06-01 | YCBytebot Bytebot is the open source container for AI desktop agents. · bytebot.ai | acquired |
| 2021-06-01 | Nonprofit telehealth coaches for underserved Americans on Medicaid · veranohealth.org | acquired |
| 2021-06-01 | YCVogent Build Voice AI Agents · vogent.ai | acquired |
| 2021-06-01 | YCMentum AI-Powered Assistant for Procurement and Strategic Sourcing · getmentum.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.