You asked about Recommendation System
47 people built something like it. 2 are gone.
That is 4% of the ones whose fate we could settle, against 23% across the whole register. 1 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2023-01-01 | AI Powered Product Discovery · rubberduckylabs.io | gone |
| 2022-01-01 | AI-native operating system for home service businesses · broccoli.com | still up |
| 2020-06-01 | YCLuminai Luminai is the AI platform for Health System Operations. · luminai.com | still up |
| 2019-01-01 | Bunkerhill is the agentic AI platform for health systems · bunkerhillhealth.com | still up |
| 2023-06-01 | AI Operating System for Private Market Investors · vectorshift.ai | still up |
| 2026-06-01 | Mass-produced AI strike systems and Counter-UAS · isengardindustries.com | still up |
| 2021-01-01 | YCPer Diem The AI operating system for restaurants · tryperdiem.com | still up |
| 2023-01-01 | YCMetal Metal is an AI-driven operating system for fundraising · metal.so | still up |
| 2024-06-01 | YCmdhub AI-native operating system for behavioral health clinics. · mdhub.ai | still up |
| 2020-06-01 | AI-native Operating System for Enterprise Ecommerce Companies · hypotenuse.ai | still up |
| 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 |
| 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 |
| 2022-01-01 | AI-driven HVAC control system for improved energy performance · axross.co | still up |
| 2025-01-01 | YCScout AI-powered student information system for K-12 schools · scoutforschools.com | still up |
| 2026-06-01 | The AI-powered operating system for radiology networks · avocasystems.com | still up |
| 2025-09-01 | YCZavo AI Operating System for Restaurants · zavopay.com | still up |
| 2026-01-01 | Modular AI-Commanded Drones for Defence · seeing-systems.com | still up |
| 2024-01-01 | The AI operating system for commodity operations · commodityai.io | still up |
| 2022-01-01 | The System of Action for Conversation Data · spinach.ai | still up |
| 2021-06-01 | Increasing restaurant profitability through our AI Operating System · bytekitchen.io | acquired |
| 2026-01-01 | A premier AI-native law firm & legal operating system for Startups. · vectorlegal.com | still up |
| 2026-06-01 | Autonomous AI defense system for cyber attack · nebusec.ai | still up |
| 2026-06-01 | YC6thSense Nervous System for Physical AI · 6thsense.dev | still up |
| 2026-01-01 | AI operating system for mega-scale satellite networks. · constellation.space | still up |
| 2022-06-01 | Operating system for HR in the AI era · aragorn.ai | still up |
| 2024-09-01 | YCCanvas Building AI systems that improve from experience. · canvas.inc | still up |
| 2025-01-01 | YCDalus AI-Powered Hardware System Design Software · dalus.io | still up |
| 2023-01-01 | YCRetape AI Operating System for Debt Settlement · retape.ai | still up |
| 2024-06-01 | Java-native multi-agentic AI operating system for enterprise · redouble.ai | still up |
| 2023-01-01 | AI-native operating system for analytics teams · turntable.so | gone |
| 2026-01-01 | YCTepali AI operating system for modern medspas · tepali.com | still up |
| 2018-06-01 | Synkrino's AI, SATIS is a powerful, unbiased discovery system for… · synkrino.bio | still up |
| 2026-06-01 | AI Operating System for Wholesale Distribution · whitespacehq.ai | still up |
| 2025-06-01 | YCFulcrum The agentic debugger for AI systems · fulcrumresearch.ai | still up |
| 2026-01-01 | YCAutoSitu The AI operating system for the built world · autositu.com | still up |
| 2026-01-01 | AI operating system for commercial loans · proximitty.ai | still up |
| 2026-06-01 | The AI Operating System for Auto Shops. · trycarsignal.com | still up |
| 2026-06-01 | YCMireye Infrastructure for Physical World AI Agents · mireye.com | still up |
| 2024-01-01 | AI system design tools for dev teams · agenticlabs.com | still up |
| 2022-06-01 | AI Models for GIS · buntinglabs.com | still up |
| 2024-09-01 | AI Operating System for Pre-construction · permitportalapp.com | still up |
| 2025-09-01 | YCBravi The AI operating system powering home services businesses · bravi.app | still up |
| 2021-06-01 | YCMiniloop AI workflow engine for reliable systems · miniloop.ai | 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.