langchain.com · Agent Frameworks
Low level orchestration library for stateful, long running agents modelled as graphs, with persistence and human in the loop.
LangGraph is one of 18 agent framework tools on Drydock. See all agent framework tools or how we check facts.
// guides
Is LangChain free for commercial use? Yes. LangChain and LangGraph are MIT licensed. Here is what that allows, where costs start, and the one server that isn't MIT.
LangChain vs n8n compared: a code library for agents vs a visual workflow platform built on LangChain JS. Licenses, pricing, MCP and how to use both together.
LangChain vs CrewAI compared with tested code: one agent loop with middleware vs a crew of role based agents. Models, MCP, pricing and using both together.
What is the most popular AI agent framework in 2026? LangChain leads developer surveys, PyPI downloads and GitHub stars. Here are the numbers and what they hide.
The Vercel AI SDK is a free, open source TypeScript toolkit for LLM apps and agents. AI SDK 7 changes, a tested ToolLoopAgent, streaming UI, MCP and costs.
LangChain vs LangGraph, compared with tested code. Start with LangChain's create_agent, then use LangGraph when you need explicit steps and durable state.
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