LangChain
The most widely used framework for building LLM applications.
- Stars
- 147.8K
- Forks
- 24.8K
- Open issues
- 647
- Last commit
- 2026-10-15
Live from the GitHub API · updated 2026-10-15
What is LangChain?
LangChain provides standard interfaces for models, retrievers, tools and agents, plus hundreds of integrations. LangGraph, its companion library, adds stateful agent orchestration.
Key features
- Unified model and tool interfaces
- Hundreds of integrations
- Agents via LangGraph
- Python and JavaScript versions
System requirements
- Platforms
- Windows · macOS · Linux
- Python
- 3.9+
How to install LangChain
Summarized from the project’s README. Projects change quickly — check the GitHub page for the latest instructions.
pip
- 1Install the core package and a provider integration.
pip install -U langchain langchain-openai
Strengths
- Largest ecosystem
- Good for prototyping fast
Limitations
- Abstractions can feel heavy
LangChain alternatives compared
| Software | Stars | License | Platforms | VRAM |
|---|---|---|---|---|
| LangChain The most widely used framework for building LLM applications. | 147.8K | MIT | — | |
| LlamaIndex Data framework for connecting LLMs to your documents. | 52.5K | MIT | — | |
| CrewAI Python framework for orchestrating role-playing, collaborative AI agents. | 59.7K | MIT | — | |
| AutoGen Microsoft’s framework for building multi-agent AI applications. | 61.4K | CC-BY-4.0 | — | |
| Open WebUI Self-hosted ChatGPT-style interface for Ollama and OpenAI-compatible APIs. | 155.7K | Open WebUI License (BSD-3-Clause based) | — | |
| LibreChat Open-source ChatGPT clone supporting every major AI provider. | 45.7K | MIT | — |
FAQ
Is LangChain free?
Yes — LangChain is open-source software released under the MIT license. Check the license (and any model weight licenses) before commercial use.
Does LangChain run on Windows, Mac and Linux?
LangChain supports: Windows, macOS, Linux.
How do I install LangChain?
1. Install the core package and a provider integration.
What are the best LangChain alternatives?
Popular alternatives include LlamaIndex, CrewAI, AutoGen, Open WebUI. See the comparison table on this page.