langchain
by langchain-aiThe agent engineering platform.
About langchain
langchain is a Python open-source ai agents project by langchain-ai. The agent engineering platform. With 139,898 GitHub stars and 23,201forks, it's one of the AI Agents tools worth knowing. You can download the source, browse it on GitHub, or read the full setup guide in the README below.
From the project README
<div align="center"> <a href="https://docs.langchain.com/oss/python/langchain/overview"> <picture> <source media="(prefers-color-scheme: dark)" srcset=".github/images/logo-dark.svg"> <source media="(prefers-color-scheme: light)" srcset=".github/images/logo-light.svg"> <img alt="LangChain Logo" src=".github/images/logo-dark.svg" width="50%"> </picture> </a> </div>
<div align="center"> <h3>The agent engineering platform.</h3> </div>
<div align="center"> <a href="https://opensource.org/licenses/MIT" target="_blank"><img src="https://img.shields.io/pypi/l/langchain" alt="PyPI - License"></a> <a href="https://pypistats.org/packages/langchain" target="_blank"><img src="https://img.shields.io/pepy/dt/langchain" alt="PyPI - Downloads"></a> <a href="https://pypi.org/project/langchain/#history" target="_blank"><img src="https://img.shields.io/pypi/v/langchain?label=%20" alt="Version"></a> <a href="https://x.com/langchain_oss" target="_blank"><img src="https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain" alt="Twitter / X"></a> </div>
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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]
This is an excerpt from the project's own README, quoted here for reference. Read the full README on GitHub →
langchain — FAQ
What is langchain?
The agent engineering platform.
Is langchain free to use?
Yes. langchain is open-source and free. You can browse the source on GitHub or download it here at no cost — no signup required.
How do I install and run langchain?
Download the latest source as a ZIP from GitHub (or clone the master branch), then follow the setup steps in the README below.
What language is langchain written in?
langchain is primarily written in Python.
How popular is langchain?
langchain has 139,898 stars and 23,201 forks on GitHub, and was last updated 6/22/2026 — a useful signal of how actively it's maintained and trusted by developers.
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