LangChain

open source

The most widely adopted framework for building LLM applications and agents.

Updated 2026-03-17

Agent FrameworksFree· Open source and free. LangSmith (observability/tracing) has a free tier.Visit site Docs

LangChain is an open-source framework for building applications powered by language models. It provides abstractions for chains, agents, memory, and tool use. LangGraph (part of the LangChain ecosystem) adds graph-based agent orchestration for more complex multi-step workflows.

Use Cases

·Building complex LLM chains and pipelines
·RAG (retrieval-augmented generation) systems
·Multi-agent orchestration with LangGraph
·Integrating 100+ data sources and tools
·Agent memory and state management

Key Points

·Most popular LLM framework with extensive integrations
·LangGraph enables stateful, multi-step agent workflows
·Supports Python and JavaScript/TypeScript
·LangSmith provides observability and tracing for production agents

LangChain

Use Cases

Key Points

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