You asked about Time Series
32 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 |
|---|---|---|
| 2022-01-06 | obviously.ai | still up |
| 2021-09-07 | blog.spiceai.org | still up |
| 2022-06-14 | codeball.ai | still up |
| 2022-01-19 | dubverse.ai | still up |
| 2022-01-01 | YCvoize We build the AI companion for nurses, to create time for care. · voize.de | still up |
| 2022-07-20 | copysmith.ai | still up |
| 2023-06-01 | YCVetRec AI Scribe for veterinarians. Saving time and improving patient care. · vetrec.io | still up |
| 2024-01-01 | YCPointOne AI Time Platform for Law Firms · pointone.com | still up |
| 2014-01-01 | YCMixerBox AI Super-Apps to Live Easier | The anything anytime superapps… · mixerbox.com | still up |
| 2023-11-21 | mylens.ai | still up |
| 2022-11-29 | airy.co | still up |
| 2026-06-01 | AI engineer that debugs and fixes production incidents in realtime · hyperprobe.co | still up |
| 2023-10-21 | storybooks.app | still up |
| 2021-01-01 | Cut your writing time by 40% with AI-powered autocomplete · compose.ai | still up |
| 2023-11-09 | allcancode.com | still up |
| 2023-12-26 | timeevidence.com | still up |
| 2024-01-01 | YCMarblism AI Employees who love overtime · marblism.com | still up |
| 2026-01-01 | AI Infra for real-time vision applications · overshoot.ai | still up |
| 2023-09-07 | fantasaur.com | still up |
| 2023-10-20 | hn-ai-newsletter.beehiiv.com | still up |
| 2025-09-01 | YCMoss Real-time semantic search for Conversational AI · moss.dev | still up |
| 2023-01-01 | YCDecohere Real-time generative AI · decohere.ai | still up |
| 2026-01-01 | YCCaretta Realtime AI for Sales Calls · caretta.so | still up |
| 2026-06-01 | AI that turns any camera to an autonomous worker with real-time vision · openvector.com | still up |
| 2026-09-01 | YCMaritime The managed cloud for AI agents. · maritime.sh | still up |
| 2026-01-01 | Real-time Physics Simulations for Industrial Facilities & Data Centers · inviscidai.com | still up |
| 2025-01-01 | Character.AI with real time video avatars · dollyglot.com | still up |
| 2023-06-01 | YCInlet AI timekeeping for legal professionals. · inletai.com | still up |
| 2025-09-01 | YCThe Hog Real-time web intelligence API for AI agents and GTM teams · thehog.ai | still up |
| 2025-01-01 | Real-time AI translator for global sales and marketing · cuckoo.so | still up |
| 2024-09-01 | YCISSEN AI realtime voice companion for language learning · issen.com | still up |
| 2026-06-01 | We give AI agents realtime web context via API · context.dev | still up |
How this compares
Y Combinator reports its own outcomes, including acquisitions. The other two are judged by asking the domain, so they are not measured the same way and are never averaged together.
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.