head to head · open source
langchain vs feynman
langchain has 147,021 GitHub stars, 24,603 forks, 492 open issues and last shipped yesterday. feynman has 9,781 stars, 1,087 forks, 1 open issues and last shipped today. langchain leads on adoption by 1,403% (147,021 vs 9,781 stars). langchain is written in Python under MIT; feynman is written in TypeScript under MIT. langchain has attracted 17% as many forks as stars, feynman 11%. feynman was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| langchain | feynman | |
|---|---|---|
| GitHub stars | ★ 147K | ★ 9.8K |
| License | MIT | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-24 | 2026-09-25 |
| Forks | ⑂ 25K | ⑂ 1.1K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick langchain if
- You weight community size — 147K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick feynman if
- You want the feynman feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and feynman fits your workflow better
About langchain
LangChain is an open source framework for building agents and LLM powered applications, written in Python and released under the MIT license. It lives in the AI and machine learning ecosystem, specifically among AI development platforms, and it works by chaining together interoperable components and third party integrations so that AI application development becomes simpler. The project describes itself as the agent engineering platform, and its abstractions are designed to keep applications working as the underlying technology evolves.
read the full langchain overview →
About feynman
Feynman is the open source AI research agent: an MIT licensed TypeScript command line tool that searches papers and the web and answers with cited sources, aimed at researchers, engineers, and research groups.
read the full feynman overview →
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Frequently asked questions
Is langchain or feynman more popular?
langchain has 147,021 GitHub stars and feynman has 9,781. langchain has the larger community by that measure.
Are langchain and feynman free?
Both are open source. langchain is licensed under MIT and feynman under MIT. Neither carries a licence fee.
What is the difference between langchain and feynman?
langchain is written in Python and feynman in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, langchain or feynman?
Choose langchain if you want the larger community (147,021 stars) or its MIT licence terms. Choose feynman if its feature set, stack or MIT licence fits better. Both are self-hostable.