You asked about Open Source
37 people built something like it. 4 are gone.
That is 12% of the ones whose fate we could settle, against 23% across the whole register. 4 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2024-01-01 | YCOnyx Open Source AI Chat · onyx.app | acquired |
| 2024-01-01 | YCUbicloud Open source alternative to AWS · ubicloud.com | still up |
| 2024-06-01 | YCMem0 The Memory layer for AI Agents · mem0.ai | still up |
| 2024-01-01 | Open-source humanoid robots · kscale.dev | gone |
| 2024-06-01 | Open-Source Reinforcement Learning (RL) & Fine-tuning for LLMs. · unsloth.ai | still up |
| 2024-01-01 | YCTrieve All-in-one API for search, RAG, & recommendations · trieve.ai | acquired |
| 2024-01-01 | YCHatchet The orchestration platform for teams who ship. · hatchet.run | still up |
| 2024-06-01 | Workspace for your AI Agents, Build any Workflow. · dench.com | still up |
| 2024-01-01 | Autonomously scaling environments · vibrantlabs.com | still up |
| 2024-01-01 | YCTesseral The open source platform for managing identity in business software · tesseral.com | gone |
| 2024-06-01 | The Open Source Agentic Browser · browseros.com | still up |
| 2024-01-01 | YCTusk AI agent that generates unit and integration tests · usetusk.ai | acquired |
| 2024-01-01 | YCLantern Postgres vector database extension to build AI applications · lantern.dev | gone |
| 2024-06-01 | Open-source AI coworker with memory · rowboatlabs.com | still up |
| 2024-01-01 | YCPandasAI PandasAI is an open-source conversational data analysis platform with… · pandas-ai.com | still up |
| 2024-06-01 | YCcmux Open source applied AI lab building next-gen devtools · cmux.com | still up |
| 2024-01-01 | Optimize performance on GPUs - 10x faster · ncompass.tech | still up |
| 2024-06-01 | Open source AI copilot that knows your company's code and its context · storia.ai | still up |
| 2024-06-01 | YCMinusX Open source agentic BI for founders · minusx.ai | still up |
| 2024-06-01 | YCVoid The open source Cursor alternative · useglass.ai | still up |
| 2024-01-01 | YCAedilic Open-Source AI-generated image/deepfake detection · nonescape.com | gone |
| 2024-06-01 | YCCerulion Open source operating system for robots · cerulion.com | still up |
| 2024-01-01 | Security for AI-native developers · superagent.sh | still up |
| 2024-01-01 | AI tooling · withpretzel.com | still up |
| 2024-01-01 | The fastest developer experience for building on open source AI. · openfoundry.ai | still up |
| 2024-06-01 | YCOpslane Verify AI-generated code before you ship it · opslane.com | still up |
| 2024-06-01 | Random labs is building long running autonomous coding agents. · randomlabs.ai | still up |
| 2024-01-01 | YCTracecat The open source AI-native security automation platform · tracecat.com | still up |
| 2024-01-01 | YCOpen Enterprise AI customer support · open.cx | still up |
| 2024-06-01 | YCCentral Payroll, benefits, state compliance & other bullsh*t for startups · centralhq.com | acquired |
| 2024-06-01 | Rippling for seasonal workers · firstwork.com | still up |
| 2024-01-01 | YCOpencall Practice admin run by AI · opencall.ai | still up |
| 2024-01-01 | YCOpenmart Local business data intelligence platform · openmart.com | still up |
| 2024-09-01 | We help humans & agents pick tools via Independent Benchmarks · openbenchmarks.com | still up |
| 2024-01-01 | YCmalibou the first all-in-one payroll and HR software for French SMBs · malibou.co | still up |
| 2024-06-01 | Helping America's businesses become employee owned · villagelabs.app | still up |
| 2024-06-01 | YCet al. Feed of insights extracted from your go-to sources using LLMs. · et-al.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.