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LangChain
Framework for building applications with language models
Overview
LangChain is the most popular open-source framework for building LLM-powered applications. It provides tools for prompt management, chains, agents, memory, and retrieval augmented generation (RAG).
Features
Prompt templates and management
Chains and agents
RAG support
Memory systems
100+ integrations
LangSmith observability
How to Get Started
Install with pip install langchain (Python) or npm install langchain (JS/TS). Follow the quickstart guide at docs.langchain.com to build your first chain.
Pricing
Free & Open Source / LangSmith paid
View pricing detailsFAQ
What is LangChain used for?
LangChain is used to build chatbots, RAG systems, AI agents, document Q&A, and any application that needs LLM integration.