You asked about Recommendation System
14 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 |
|---|---|---|
| 2025-09-01 | YCLexi AI Operating System for Legal Teams · getlexi.io | still up |
| 2025-01-01 | AI powered operating system for distributors and OEMs · salespatriot.com | still up |
| 2025-01-01 | YCMentra Building the open source smart glasses operating system. · mentra.glass | still up |
| 2025-01-01 | YCScout AI-powered student information system for K-12 schools · scoutforschools.com | still up |
| 2025-09-01 | YCZavo AI Operating System for Restaurants · zavopay.com | still up |
| 2025-01-01 | connect, migrate and implement enterprise systems · superglue.ai | still up |
| 2025-06-01 | Automatically blocking risky behavior with real-time governance agents · truthsystems.ai | still up |
| 2025-06-01 | YCburnt Agentic Operating System for Food Supply Chain · getburnt.ai | still up |
| 2025-01-01 | YCDalus AI-Powered Hardware System Design Software · dalus.io | still up |
| 2025-06-01 | YCMonarcha Turn maps into data · monarcha.ai | still up |
| 2025-06-01 | Foundation models for physical systems · getirongrid.com | still up |
| 2025-09-01 | YCBravi The AI operating system powering home services businesses · bravi.app | still up |
| 2025-06-01 | YCFulcrum The agentic debugger for AI systems · fulcrumresearch.ai | still up |
| 2025-09-01 | A robotics intelligence system for metal fabrication · forge-robotics.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.