You asked about Recommendation System
42 people built something like it. 13 are gone.
That is 31% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2022-05-26 | vertigo.ai | unverified |
| 2022-06-03 | webosarchive.com | unverified |
| 2023-03-14 | modernfontstacks.com | still up |
| 2023-06-19 | hn-recommend.julienc.me | still up |
| 2023-12-12 | aods.cryingpotato.com | still up |
| 2023-01-19 | jamsync.dev | moved |
| 2021-07-17 | gorse.io | still up |
| 2021-11-27 | mood2movie.com | still up |
| 2023-04-12 | librarian-ai.com | gone |
| 2023-08-15 | servicer.dev | still up |
| 2021-11-23 | tamagui.dev | still up |
| 2022-06-16 | lockable.dev | unverified |
| 2023-05-22 | wiktok.org | moved |
| 2023-12-08 | r3ply.com | still up |
| 2021-02-09 | polarsignals.com | still up |
| 2021-07-22 | readow.ai | still up |
| 2026-08-24 | vanillaos.org | unverified |
| 2023-10-06 | whattoreadafter.xyz | gone |
| 2023-04-03 | pubnix.pink | gone |
| 2022-11-25 | search.rye.com | gone |
| 2022-04-23 | reddrecs.com | still up |
| 2021-04-01 | cfs.stokeo.com | gone |
| 2021-11-17 | filecream.com | unverified |
| 2022-01-24 | nootroflix.com | still up |
| 2022-04-20 | corise.com | gone |
| 2023-08-17 | tripbespoke.com | still up |
| 2023-02-03 | getproduct.help | gone |
| 2021-04-14 | storagetarget.com | still up |
| 2023-05-16 | zacksiri.dev | still up |
| 2022-08-22 | jamsync.io | gone |
| 2021-09-25 | nftworlds.com | still up |
| 2023-05-16 | heyollie.ai | unverified |
| 2026-09-04 | japanmap.fyi | unverified |
| 2022-05-27 | personalfilesystem.org | gone |
| 2023-05-11 | selecta.ciaran.co.za | still up |
| 2022-03-16 | contentblocksjs.com | unverified |
| 2022-08-10 | juicefs.com | still up |
| 2022-12-21 | workat.tech | still up |
| 2021-02-17 | getoasys.io | unverified |
| 2021-02-20 | understandingdistributed.systems | still up |
| 2021-08-12 | what3books.com | unverified |
| 2023-02-13 | wiki.krxiang.com | unverified |
| 2023-04-20 | designducky.ai | gone |
| 2023-10-12 | zama.ai | moved |
| 2022-06-09 | getgwak.com | still up |
| 2022-03-28 | neverinstall.com | still up |
| 2021-10-12 | git.disroot.org | still up |
| 2021-09-26 | uk.policyengine.org | still up |
| 2021-07-13 | wasi.fyi | gone |
| 2023-10-11 | vectoradmin.com | unverified |
| 2021-03-08 | caint.casa | gone |
| 2021-03-25 | hoppscotch.io | still up |
| 2023-03-19 | dbohdan.sdf.org | unverified |
| 2022-11-15 | thoughtfulpost.com | unverified |
| 2021-11-15 | maxmcd.com | still up |
| 2022-05-15 | poppy.io | unverified |
| 2022-08-02 | mypelotonclasses.com | gone |
| 2021-12-04 | jamcomments.com | still up |
| 2021-06-12 | worksheet.systems | still up |
| 2026-08-25 | use-fs.com | unverified |
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.