LangChain
Verified
The most popular framework for building LLM applications — chains, agents, and RAG made easy.
About LangChain
LangChain is the dominant open-source framework for building applications with large language models. It provides composable components for chains, agents, RAG, memory, and tool use. Available in Python and JavaScript with LangSmith for observability.
Key Features
- Composable LLM application framework
- Agent and tool use support
- RAG and retrieval pipelines
- LangSmith for debugging and monitoring
- Python and JavaScript SDKs
Pros & Cons
Pros
+ Largest LLM framework ecosystem
+ Excellent documentation
+ Huge integration library
Cons
- Can be over-abstracted for simple tasks
- Frequent breaking changes
- Learning curve for the full framework
Use Cases
Building RAG applicationsCreating AI agentsLLM application developmentPrototyping AI workflows
Pricing
Open source
Open-source framework. LangSmith: free tier + paid plans.
Who It's For
AI developersBackend engineersData scientistsAI startups
Details
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