LangChain
The leading framework for building LLM apps and agent workflows.
- Pricing
- Freemium
- Best for
- Developers building production LLM applications
- Platforms
- Python, JavaScript, Web
- Last verified
- 2026-09-11
A widely used open-source framework for LLM and agent applications, complemented by the LangSmith platform for observability, evaluation, deployment, and other production workflows.
