head to head · open source
langchain vs Foundry
langchain has 148,892 GitHub stars, 25,031 forks, 492 open issues and last shipped yesterday. Foundry has 893 stars, 136 forks, 5 open issues and last shipped 7 days ago. langchain leads on adoption by 16,573% (148,892 vs 893 stars). langchain is written in Python under MIT; Foundry is written in Python under Apache-2.0. langchain has attracted 17% as many forks as stars, Foundry 15%. langchain was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (agents, ai, ai-agents), so they are genuine substitutes rather than adjacent tools.
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 | Foundry | |
|---|---|---|
| GitHub stars | ★ 149K | ★ 893 |
| License | MIT | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-11-02 | 2026-10-27 |
| Forks | ⑂ 25K | ⑂ 136 |
| 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 Foundry if
- You want the Foundry feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and Foundry 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 Foundry
Promptise Foundry The first full stack Agentic Engineering framework. Build agents and the tools they use. Design how they reason. Run them as autonomous, governed systems. Ship them to real customers — multi tenant, secure, and observable. One framework, not a dozen libraries. Website · Documentation · Quick Start · Blog · Discussions What Promptise is Promptise is one framework for the whole job of building with AI agents — the agents, the tools they use, the reasoning behind them, the runtime that keeps them running, and the security and governance to put them in front of customers. Not a single feature, but…
read the full Foundry overview →
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Frequently asked questions
Is langchain or Foundry more popular?
langchain has 148,892 GitHub stars and Foundry has 893. langchain has the larger community by that measure.
Are langchain and Foundry free?
Both are open source. langchain is licensed under MIT and Foundry under Apache-2.0. Neither carries a licence fee.
What is the difference between langchain and Foundry?
langchain is written in Python and Foundry in Python. 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 Foundry?
Choose langchain if you want the larger community (148,892 stars) or its MIT licence terms. Choose Foundry if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.