You asked about Open Source
89 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 |
|---|---|---|
| 2023-04-05 | quadratichq.com | still up |
| 2023-09-08 | rivet.ironcladapp.com | still up |
| 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 |
| 2023-07-17 | chathub.gg | still up |
| 2021-06-01 | YCLago The AI Native Billing Platform · getlago.com | still up |
| 2022-01-01 | YCLanceDB Open-source, serverless vectordb for production-scale generative AI · lancedb.com | still up |
| 2022-01-01 | YCBotCity Observability and Governance for AI-Generated Python scripts. · botcity.dev | still up |
| 2021-09-07 | blog.spiceai.org | 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 |
| 2025-06-01 | YCKERNEL Crazy fast, open source infra for AI agents to use the Internet · kernel.sh | still up |
| 2023-06-01 | YCTiptap The open-source document editor for humans and AI agents. · tiptap.dev | still up |
| 2023-12-19 | tryreason.dev | still up |
| 2018-06-01 | Database for AI · activeloop.ai | still up |
| 2022-11-29 | airy.co | 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 |
| 2023-01-10 | herbsjs.org | still up |
| 2024-06-01 | YCMem0 The Memory layer for AI Agents · mem0.ai | still up |
| 2023-11-11 | smry.ai | still up |
| 2023-06-01 | YCSkyvern Open Source AI Agent to automate browser workflows via an API · skyvern.com | still up |
| 2022-06-01 | Open-source, AI-first and no-code business automation tool · activepieces.com | still up |
| 2021-06-01 | Plan and review AI generated code · vibekanban.com | still up |
| 2022-06-01 | YCLamin Open data platform for traceable, multimodal AI · lamin.ai | still up |
| 2023-01-01 | YCLiteLLM Call every LLM API like it's OpenAI [100+ LLMs] · litellm.ai | still up |
| 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 |
| 2025-06-01 | Tiny Edge AI For Tiny Devices · cactuscompute.com | still up |
| 2025-01-01 | The LLM Eval and Observability Platform for AI Quality · confident-ai.com | still up |
| 2023-07-31 | superflows.ai | still up |
| 2023-09-16 | illa.ai | still up |
| 2023-01-01 | YCUnify AI teammates for everyone else 🤖 · unify.ai | still up |
| 2024-06-01 | Workspace for your AI Agents, Build any Workflow. · dench.com | still up |
| 2021-06-01 | The complete production quality platform. AI-powered E2E testing,… · artillery.io | still up |
| 2022-01-01 | YCBeam AI-Native Cloud Platform · beam.cloud | still up |
| 2023-09-05 | talkform.ai | still up |
| 2025-09-01 | Simulate your customers with AI agents · expectedparrot.com | still up |
| 2022-06-01 | Building the definitive all-in-one on-device AI productivity tool · anythingllm.com | still up |
| 2022-01-01 | We make Orca, MIT open source terminal-based agent orchestrator · onorca.dev | still up |
| 2025-06-01 | Open source self-improving layer for AI agents · traceroot.ai | still up |
| 2025-01-01 | Open Source React.js Library for AI Chat · assistant-ui.com | still up |
| 2025-06-01 | YCPangolin Open networking and security for your workforce, AI agents, and infra · pangolin.net | still up |
| 2024-06-01 | YCcmux Open source applied AI lab building next-gen devtools · cmux.com | still up |
| 2024-06-01 | Open-source AI coworker with memory · rowboatlabs.com | still up |
| 2025-09-01 | Helping humans and AI agents understand massive codebases · sourcebot.dev | still up |
| 2026-06-01 | Open source AI gateway that turns your traffic into a better model · experientiallabs.ai | still up |
| 2026-06-01 | Self-optimizing neocloud that cuts LLM costs by 100x · understudylabs.com | still up |
| 2021-06-01 | Open-source monitoring for machine learning models · evidentlyai.com | still up |
| 2023-06-01 | YCHegel AI Open source tools for developing generative AI applications · hegel-ai.com | still up |
| 2023-06-01 | YCKhoj AI for humans · khoj.dev | still up |
| 2024-01-01 | AI tooling · withpretzel.com | still up |
| 2025-06-01 | YCChar The AI notepad that knows and works for you · char.com | still up |
| 2024-01-01 | Security for AI-native developers · superagent.sh | still up |
| 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 |
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.