You asked about Open Source
117 people built something like it. 14 are gone.
That is 13% of the ones whose fate we could settle, against 23% across the whole register. 10 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2023-04-05 | quadratichq.com | still up |
| 2023-09-08 | rivet.ironcladapp.com | still up |
| 2022-01-05 | nonnfts.com | gone |
| 2016-01-01 | YCDaily Conversational Voice and Multimodal AI built with Open Source · daily.co | still up |
| 2020-01-01 | YCAirbyte Context layer for production-grade AI agents · airbyte.com | still up |
| 2026-10-13 | parsimony.lasu.dev | unverified |
| 2023-12-04 | aiconsole.ai | moved |
| 2023-07-17 | chathub.gg | still up |
| 2021-06-01 | YCLago The AI Native Billing Platform · getlago.com | still up |
| 2021-09-03 | examples.jina.ai | gone |
| 2023-09-18 | gron.games | gone |
| 2023-05-23 | unskript.com | unverified |
| 2022-01-01 | YCLanceDB Open-source, serverless vectordb for production-scale generative AI · lancedb.com | still up |
| 2021-09-07 | blog.spiceai.org | still up |
| 2022-01-01 | YCBotCity Observability and Governance for AI-Generated Python scripts. · botcity.dev | still up |
| 2023-12-08 | deepmake.com | still up |
| 2023-09-08 | vanna.ai | still up |
| 2021-01-01 | YCauthzed Authorization Infrastructure securing AI at OpenAI, Zoom, & more · authzed.com | still up |
| 2025-01-01 | YCMastra The Javascript framework for building AI agents, from the Gatsby devs · mastra.ai | still up |
| 2021-01-01 | YCOpenCode The open source AI coding agent · opencode.ai | still up |
| 2024-01-01 | YCRespan Open-source, extensible AI gateway with observability and evals · respan.ai | still up |
| 2025-06-01 | YCKERNEL Crazy fast, open source infra for AI agents to use the Internet · kernel.sh | still up |
| 2024-01-01 | YCOnyx Open Source AI Chat · onyx.app | acquired |
| 2023-03-07 | yobulk.dev | gone |
| 2023-01-01 | YCLangfuse Open source LLM engineering platform · langfuse.com | acquired |
| 2023-06-01 | YCTiptap The open-source document editor for humans and AI agents. · tiptap.dev | still up |
| 2023-05-26 | embedditor.ai | gone |
| 2023-12-19 | tryreason.dev | still up |
| 2022-11-29 | airy.co | still up |
| 2018-06-01 | Database for AI · activeloop.ai | still up |
| 2023-07-04 | codecept.io | still up |
| 2023-11-21 | chatwoot.ai | still up |
| 2021-01-01 | YCChatwoot The modern, open source, self-hosted AI customer support platform · chatwoot.com | still up |
| 2023-08-22 | demo.uptrain.ai | unverified |
| 2023-01-10 | herbsjs.org | still up |
| 2022-06-01 | YCLamin Open data platform for traceable, multimodal AI · lamin.ai | still up |
| 2023-10-01 | sugarcaneai.dev | gone |
| 2022-06-01 | Open-source, AI-first and no-code business automation tool · activepieces.com | still up |
| 2023-01-01 | YCLiteLLM Call every LLM API like it's OpenAI [100+ LLMs] · litellm.ai | still up |
| 2023-11-11 | smry.ai | still up |
| 2024-06-01 | YCMem0 The Memory layer for AI Agents · mem0.ai | still up |
| 2021-06-01 | Plan and review AI generated code · vibekanban.com | still up |
| 2023-06-01 | YCSkyvern Open Source AI Agent to automate browser workflows via an API · skyvern.com | still up |
| 2026-08-19 | xalgorix.com | still up |
| 2023-01-01 | Know what your LLM is doing — and why it’s failing · traceloop.com | acquired |
| 2023-01-01 | Build and deploy fully‑managed AI agents and workflows · trigger.dev | still up |
| 2024-06-01 | Open-Source Reinforcement Learning (RL) & Fine-tuning for LLMs. · unsloth.ai | still up |
| 2026-08-18 | chatoss.ai | still up |
| 2023-06-28 | bulletpoints.news | gone |
| 2025-01-01 | Production Monitoring & Evals for AI Agents · confident-ai.com | still up |
| 2023-07-31 | superflows.ai | still up |
| 2023-09-16 | illa.ai | still up |
| 2024-06-01 | Workspace for your AI Agents, Build any Workflow. · dench.com | still up |
| 2026-09-17 | runerrand.dev | unverified |
| 2023-05-07 | pixelfy.ai | gone |
| 2021-06-01 | The complete production quality platform. AI-powered E2E testing,… · artillery.io | still up |
| 2023-07-20 | 100.builders | gone |
| 2025-09-01 | Simulate your customers with AI agents · expectedparrot.com | still up |
| 2023-06-01 | Open source GenAI development platform · flowiseai.com | acquired |
| 2023-01-01 | YCHelicone LLM Observability for Developers · helicone.ai | acquired |
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.