head to head · open source
langchain vs pezzo
langchain has 146,562 GitHub stars, 24,508 forks, 492 open issues and last shipped today. pezzo has 3,273 stars, 279 forks, 54 open issues and last shipped 28 days ago. langchain leads on adoption by 4,378% (146,562 vs 3,273 stars). langchain is written in Python under MIT; pezzo is written in TypeScript under Apache-2.0. langchain has attracted 17% as many forks as stars, pezzo 9%. langchain was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (ai, langchain), 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 | pezzo | |
|---|---|---|
| GitHub stars | ★ 147K | ★ 3.3K |
| License | MIT | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-09-18 | 2026-08-21 |
| Forks | ⑂ 25K | ⑂ 279 |
| 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 pezzo if
- You want the pezzo feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and pezzo 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 pezzo
Pezzo is a fully cloud native and open source LLMOps platform. Seamlessly observe and monitor your AI operations, troubleshoot issues, save up to 90% on costs and latency, collaborate and manage your prompts in one place, and instantly deliver AI changes. ✨ Features Documentation Click here to navigate to the Official Pezzo Documentation In the documentation, you can find information on how to use Pezzo, its architecture, including tutorials and recipes for varius use cases and LLM providers. Supported Clients Feature Node.js • Docs Python • Docs LangChain Prompt Management ✅ ✅ ✅ Observability ✅ ✅ ✅ Caching ✅ ✅ ✅…
read the full pezzo overview →
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Frequently asked questions
Is langchain or pezzo more popular?
langchain has 146,562 GitHub stars and pezzo has 3,273. langchain has the larger community by that measure.
Are langchain and pezzo free?
Both are open source. langchain is licensed under MIT and pezzo under Apache-2.0. Neither carries a licence fee.
What is the difference between langchain and pezzo?
langchain is written in Python and pezzo 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 pezzo?
Choose langchain if you want the larger community (146,562 stars) or its MIT licence terms. Choose pezzo if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.