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LangChain

LangChain

Framework for building LLM apps.

8.4/10· Freemium· AI Automation· Updated June 2026
Official site

LangChain is the most popular open-source framework for building applications with LLMs.

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Editor's Review

The most adopted LLM framework. Strong ecosystem but complex API.

Pros

  • Massive ecosystem
  • Open source
  • Multi-language

Cons

  • Complex API surface

Pricing

Open Source
Free
  • Framework
LangSmith Plus
$39/seat/mo
  • Observability
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LangChain
LangChain

Framework for building LLM apps.

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