LangChain
Popular framework for building LLM apps and agents.
Verified live · 7/11/2026
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What is LangChain?
An open-source framework for chaining LLM calls, tools, and memory to build agents and RAG applications. Available in Python and JavaScript with a managed platform (LangSmith) for observability.
Pros
- Huge ecosystem
- Many integrations
- Python and JS
Cons
- Frequent API changes
- Can feel heavy
Pricing
From Free · Open source
Top LangChain alternatives
- Agno — Fast, lightweight framework for multimodal agents.
- CrewAI — Framework for orchestrating role-playing agent crews.
- DSPy — Framework for programming, not prompting, LLMs.
- Griptape — Python framework for agents, pipelines, and workflows.
- Haystack — Open-source framework for LLM search and agents.
- LangGraph — Graph-based library for stateful, multi-actor agents.