Developer tools

LangChain (incl. LangGraph)

Open-source frameworks (LangChain, LangGraph, Deep Agents) for building LLM-powered agents and applications, alongside the commercial LangSmith platform for tracing, evaluation and deployment.

By LangChain Inc.. Facts checked on official pages on 28 Sept 2026.

Official site Source code

Spec sheet

Maker: LangChain Inc.
Category: Developer tools
Also listed under: Agents
Pricing model: Open sourcesource for Pricing model (external site)
Open source: Open sourceMIT
Repository: github.com/langchain-ai/langchain (external site)
Platforms: Python library, JavaScript/TypeScript library, web (LangSmith)
Verified on: 28 Sept 2026

“Not verified” means we could not confirm the fact on an official page, so we show no value rather than a guess.

Verification notes

LangGraph repo is also MIT. Pricing page covers LangSmith.

Sources

Pages we checked on 28 Sept 2026. Always confirm pricing on the official page before you buy.

Visit langchain.com (external site)