You asked about Productivity
20 people built something like it. 1 is gone.
That is 6% of the ones whose fate we could settle, against 23% across the whole register. 3 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2023-06-01 | End-to-end content, learning, & deal intelligence for B2B sales teams · letter.ai | still up |
| 2023-06-01 | YCLangdock The all-in-one AI platform for companies. · langdock.com | still up |
| 2023-01-01 | Automate data-driven slide decks and documents with AI · rollstack.com | still up |
| 2023-06-01 | YCkapa.ai The fastest way to build AI assistants on technical content · kapa.ai | still up |
| 2023-01-01 | YCFloworks Hire the best AI Sales employees | AI SDR | AI RevOps | AI EA · floworks.ai | still up |
| 2023-01-01 | The Control Plane for Enterprise Agents · credal.ai | still up |
| 2023-06-01 | AI that audits AI — catching hallucinations before you ship them. · energent.ai | still up |
| 2023-07-27 | readyrunner.ai | unverified |
| 2023-01-01 | YCUnify AI teammates for everyone else 🤖 · unify.ai | still up |
| 2023-09-14 | officeautomata.com | unverified |
| 2023-01-01 | YCAlloy AI prototyping tool for product managers · alloy.app | still up |
| 2023-01-01 | YCType AI-native storytelling studio. · type.ai | still up |
| 2023-06-01 | YCKino AI Kino is an AI media manager and video editor for humans and agents. · kino.ai | still up |
| 2023-06-01 | YCCORE Your AI butler that understands you really well and proactively acts… · getcore.me | still up |
| 2023-01-01 | YCCardinal Your AI product backlog · cardinalapp.io | acquired |
| 2023-06-01 | YCWatto AI AI-powered McKinsey-quality reports in seconds · watto.ai | acquired |
| 2023-06-01 | YCAutotab AI agents reliable enough to do real work · autotab.com | acquired |
| 2023-01-01 | YCEpsilon AI Search Engine for Academic Research · epsilon-ai.com | still up |
| 2023-06-01 | YCKhoj AI for humans · khoj.dev | still up |
| 2023-01-01 | Helps Developers build stunning UI Lightning Fast ⚡️ · codeparrot.ai | gone |
| 2023-01-01 | YCLinkGrep AI browser copilot for teams · linkgrep.com | still up |
| 2023-01-01 | YCOverlord AI Accountability Partner · overlord.app | 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.