You asked about Developer Tools
21 people built something like it. 21 are gone.
That is 100% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2021-01-01 | YCAXAR AI Multi-agent orchestration platform · axar.ai | gone |
| 2023-06-01 | YCAtla The improvement engine for AI agents · atla-ai.com | gone |
| 2020-01-01 | YCDropbase AI app builder for internal tools. Build back-office software faster… · dropbase.io | gone |
| 2021-06-01 | Never code alone. · squire.ai | gone |
| 2023-10-05 | news.aiapipro.com | gone |
| 2022-01-01 | YCPloomber Heroku for AI · ploomber.io | gone |
| 2022-06-01 | No-code data curation for LLM fine-tuning and evaluation. · airtrain.ai | gone |
| 2023-01-01 | YCLynx AI platform for investigating and resolving engineering incidents · uselynx.ai | gone |
| 2024-01-01 | YCTusk AI agent that generates unit and integration tests · usetusk.ai | gone |
| 2023-06-01 | Aide is an AI-native , privacy-first IDE built on top of VSCode · aide.dev | gone |
| 2022-06-01 | API for Retrieval Augmented Generation · superpowered.ai | gone |
| 2023-01-01 | YCSecond AI-Native Enterprise Codebase Maintenance · second.dev | gone |
| 2025-09-01 | YCRovr AI FDE Engine that runs your engineering workflows · withrovr.com | gone |
| 2021-01-01 | YCCodeball AI-Powered Code Review · codeball.ai | gone |
| 2024-01-01 | YCToolify Build internal tools with AI · toolify.sh | gone |
| 2023-01-01 | The Gen AI evaluation and curation platform · magicflow.ai | gone |
| 2024-09-01 | YCGait Building Dev Infra for AI Software Engineers · getgait.com | gone |
| 2022-06-01 | YCBricksAI Streamlining LLM application management for enterprises · trybricks.ai | gone |
| 2023-01-01 | AI-powered data extraction engine · indexical.dev | gone |
| 2023-01-01 | Helps Developers build stunning UI Lightning Fast ⚡️ · codeparrot.ai | gone |
| 2023-06-01 | YCVango AI Development platform that makes it 10x easier to improve visual models · vango.ai | gone |
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.