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LangChain

4.6/5Free / Open Source
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Open-source framework for building LLM-powered applications and autonomous AI agents with memory and tools.

4.6
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Open-source framework for building LLM-powered applications and autonomous AI agents with memory and tools.

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❓ Frequently Asked Questions

Is LangChain free to use?

LangChain is an open-source framework and free to use. You only pay for the underlying LLM API calls (such as OpenAI or Anthropic) and any optional hosted services like LangSmith for monitoring.

What programming languages does LangChain support?

LangChain is available as a Python library and a JavaScript/TypeScript library, with largely equivalent feature sets, so you can build agents in either ecosystem.

What is LangGraph and how does it relate to LangChain?

LangGraph is a companion library built on top of LangChain for creating stateful, multi-step agents represented as graphs, with explicit control over loops, branching, and human-in-the-loop checkpoints — useful for complex production agents.