You asked about Developer Tools
38 people built something like it. 2 are gone.
That is 5% of the ones whose fate we could settle, against 23% across the whole register. 1 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2024-01-01 | YCGreptile AI code review agent with complete context of your codebase · greptile.com | still up |
| 2024-01-01 | YCRespan Self-driving observability, evals, and gateway for AI agents · respan.ai | still up |
| 2024-06-01 | YCWordware AI agents you can rely on · wordware.ai | still up |
| 2024-09-01 | YCCekura Voice AI and Chat AI agents: Testing and Observability · cekura.ai | still up |
| 2024-09-01 | YCArchil The high-performance file system that connects AI to data · archil.com | still up |
| 2024-01-01 | YCZep AI Agent Context Is Hard. We Fixed It. · getzep.com | still up |
| 2024-06-01 | YCMem0 The Memory layer for AI Agents · mem0.ai | still up |
| 2024-06-01 | YCCoval Simulation & Evaluation that scales voice and chat AI agents · coval.dev | still up |
| 2024-06-01 | YCSpur Spur is your AI QA Engineer. Test your websites with natural language. · spurtest.com | still up |
| 2024-06-01 | Open-Source Reinforcement Learning (RL) & Fine-tuning for LLMs. · unsloth.ai | still up |
| 2024-09-01 | YCInnate Personal AI Robots · innate.bot | still up |
| 2024-06-01 | YCLaminar Understand why your AI agent breaks. Iterate fast to fix it. · laminar.sh | still up |
| 2024-06-01 | YCMaitai Reliable, self-improving enterprise AI · trymaitai.com | still up |
| 2024-01-01 | Deploy trustworthy data agent that know your business · upsolve.ai | still up |
| 2024-01-01 | Helps teams work effectively with AI coding agents. · centauri-ai.tech | still up |
| 2024-06-01 | The most powerful sandboxes for AI Agents · freestyle.sh | still up |
| 2024-06-01 | YCHeroUI The UI framework for AI agents and developers to build beautiful apps. · heroui.com | still up |
| 2024-09-01 | YCx1 AI app builder for creating and launching iPhone apps · x1.new | still up |
| 2024-06-01 | The video context layer for AI. · cloudglue.dev | still up |
| 2024-01-01 | YCTusk AI agent that generates unit and integration tests · usetusk.ai | acquired |
| 2024-01-01 | QA agents that write tests 10x faster with zero maintenance · getdecipher.com | still up |
| 2024-09-01 | YCRelvy AI AI powered debugging notebooks for incident response · relvy.ai | still up |
| 2024-06-01 | YCMagiCode A Reliable AI Frontend Engineer · magicode.ai | still up |
| 2024-06-01 | AI agent that optimizes inference for embedded compute like Jetson · runlocal.ai | still up |
| 2024-06-01 | YCcmux Open source applied AI lab building next-gen devtools · cmux.com | still up |
| 2024-01-01 | YCSilogy An AI-powered test and debug platform for chip developers · silogy.io | still up |
| 2024-01-01 | YCToolify Build internal tools with AI · toolify.sh | gone |
| 2024-01-01 | The fastest developer experience for building on open source AI. · openfoundry.ai | still up |
| 2024-06-01 | Open source AI copilot that knows your company's code and its context · storia.ai | still up |
| 2024-01-01 | AI system design tools for dev teams · agenticlabs.com | still up |
| 2024-01-01 | Security for AI-native developers · superagent.sh | still up |
| 2024-01-01 | AI media creation platform for creators and developers · magichour.ai | still up |
| 2024-06-01 | ideate.xyz is an AI-powered 3D art suite on the web · ideate.xyz | still up |
| 2024-01-01 | YCNuanced the AI coding app for thinking. · nuanced.dev | still up |
| 2024-09-01 | YCGait Building Dev Infra for AI Software Engineers · getgait.com | gone |
| 2024-06-01 | Turn any website into an API. · expand.ai | still up |
| 2024-06-01 | YCOpslane Verify AI-generated code before you ship it · opslane.com | still up |
| 2024-09-01 | YCConsus The fastest and cheapest way to use AI with ITAR or CUI data. · consus.io | 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.