You asked about Recommendation System
10 people built something like it. 0 are gone.
That is 0% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2024-06-01 | YCmdhub AI-native operating system for behavioral health clinics. · mdhub.ai | still up |
| 2024-01-01 | YCCarma The AI Operating System For Modern Fleets. · joincarma.com | still up |
| 2024-09-01 | YCArchil The high-performance file system that connects AI to data · archil.com | still up |
| 2024-06-01 | Capitol: the sovereign operating system for intelligence. · capitol.ai | still up |
| 2024-01-01 | The AI operating system for commodity operations · commodityai.io | still up |
| 2024-06-01 | Java-native multi-agentic AI operating system for enterprise · redouble.ai | still up |
| 2024-09-01 | YCCanvas Building AI systems that improve from experience. · canvas.inc | still up |
| 2024-09-01 | AI Operating System for Pre-construction · permitportalapp.com | still up |
| 2024-01-01 | AI system design tools for dev teams · agenticlabs.com | still up |
| 2024-01-01 | YCScritch AI operating system for veterinary care · scritchai.com | still up |
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.