langchain.com · Agent Frameworks
Widely used framework for building LLM applications and agents, with hundreds of model, tool and data integrations.
LangChain 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.
LanceDB vs Milvus for AI agents: an embedded library on files, or a vector database that grows from a local file to a cluster. Setup, limits and the pick.
Weaviate is an open source vector database in Go with hybrid search and a built in MCP server. How it works, a tested agent memory example and cloud pricing.
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