LangChain

Framework and platform for LLM apps, agents, retrieval, and production workflows

About this tool

LangChain is a widely used framework and ecosystem for building LLM applications, agent systems, retrieval pipelines, and complex workflows that connect models, memory, tools, and external data. It has become a standard starting point for developers building AI agents, assistant products, document applications, and production orchestration around model calls. LangChain is best for developers and AI product teams looking for a mature framework for agent orchestration, tool use, retrieval, evaluation, and application architecture.

Best for

Building production LLM apps, agents, and retrieval pipelines

Key Features

Framework for tools, memory, and chains
Strong agent and retrieval support
Large ecosystem and community adoption
Good fit for production AI application architecture

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Free framework for building AI apps

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Open-source libraries
Agent and retrieval tooling
Flexible architecture
Developer-first ecosystem

Platform

Commercial platform products and support

Custom

Managed platform features
Observability and evaluation tools
Commercial support path
Enterprise deployment options

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