head to head · open source
langchain vs feynman
langchain has 149,231 GitHub stars, 25,099 forks, 492 open issues and last shipped yesterday. feynman has 10,092 stars, 1,107 forks, 1 open issues and last shipped 2 days ago. langchain leads on adoption by 1,379% (149,231 vs 10,092 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%. langchain 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 | ★ 149K | ★ 10K |
| License | MIT | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-11-09 | 2026-11-08 |
| Forks | ⑂ 25K | ⑂ 1.1K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick langchain if
- You weight community size — 149K 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
The agent engineering platform. LangChain is a framework for building agents and LLM powered applications. It helps you chain together interoperable components and third party integrations to simplify AI application development — all while future proofing decisions as the underlying technology evolves. [!TIP] Just getting started? Check out Deep Agents — a higher level package built on LangChain for agents that have built in capabilities for common usage patterns such as planning, subagents, file system usage, and more. Quickstart If you're looking for more advanced customization or agent orchestration, check…
read the full langchain overview →
About feynman
The open source AI research agent. Installation macOS / Linux: Windows (PowerShell): The one line installer fetches the latest tagged release as a standalone bundle with its own Node.js runtime and verifies its SHA 256 before installing. To pin a version, pass it explicitly, for example curl fsSL bash s 0.5.3 . Rerun the installer to upgrade; feynman update only updates optional Pi packages you installed. npm alternative (uses your local Node.js =22.22.0 ): If you installed the interim @advaitpaliwal/feynman package, migrate once: Then run feynman setup to sign in to a model provider. To use Feynman in an ACP…
read the full feynman overview →
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Frequently asked questions
Is langchain or feynman more popular?
langchain has 149,231 GitHub stars and feynman has 10,092. 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 (149,231 stars) or its MIT licence terms. Choose feynman if its feature set, stack or MIT licence fits better. Both are self-hostable.