You asked about Recommendation System
20 people built something like it. 20 are gone.
That is 100% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2009-06-01 | FanChatter aggregates, amplifies and empowers fan content on every… · fanchatter.com | gone |
| 2023-01-01 | AI Powered Product Discovery · rubberduckylabs.io | gone |
| 2018-01-01 | Next-gen blood testing to provide 1000x more data to pharma companies · correliabio.com | gone |
| 2022-01-01 | The operating system for factory production lines · aisupervision.com | gone |
| 2020-01-01 | Multiverse is a web-based game creation system inspired by Dungeons &… · playmultiverse.com | gone |
| 2021-06-01 | YCAlgofi Building the new financial system · algofi.org | gone |
| 2018-06-01 | Operating systems for biology labs · radix.bio | gone |
| 2006-06-01 | Community-curated catalogs for product recommendations · zanbazaar.com | gone |
| 2011-06-01 | YCPhoneSys The Phone System for Sales Teams. · pingm.net | gone |
| 2023-01-01 | AI-native operating system for analytics teams · turntable.so | gone |
| 2021-01-01 | YCPlatypus The Distributed Data Operating System · getplatypus.com | gone |
| 2013-06-01 | YCAmulyte Remote monitoring & activity tracking system for seniors. · amulyte.com | gone |
| 2012-06-01 | YCViacycle viaCycle makes simple, inexpensive bicycle sharing systems that allow… · viacycle.com | gone |
| 2012-06-01 | YCProfig The phone system for businesses. Manage everything from your company… · profig.com | gone |
| 2013-06-01 | Replacing the paper restaurant menu with an interactive experience at… · buttersystems.com | gone |
| 2015-06-01 | Building the lowest-power silicon for embedded deep learning and… · remicro.com | gone |
| 2017-01-01 | YCCowlar Fitbit for dairy cows. Farms use cowlar's alerts & recommendations to… · cowlar.com | gone |
| 2021-01-01 | YCLunatic Operating System for server-side apps · lunatic.solutions | gone |
| 2021-01-01 | Building the operating system for diagnosis. · bewelldigital.com | gone |
| 2018-06-01 | Democratizing gene therapy by reinventing its manufacturing and… · perception.bio | gone |
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.