# LangChain

> Frameworks and tools for building LLM apps and agents.

Source: https://trustkite.com/review/langchain/
Last updated: 2026-10-24

## Customer rating

No customer reviews on TrustKite yet.

## About LangChain

LangChain is a widely used open-source framework for building applications with language models, such as chatbots, retrieval systems and agents. LangGraph, from the same company, helps build reliable, stateful agents.

LangSmith, the company's commercial platform, provides tracing, evaluation and monitoring for AI applications. The frameworks are free and open source, while LangSmith has free and paid tiers. The frameworks support Python and JavaScript and integrate with many model providers and databases.

## Key facts

- Founded: 2022
- Based in: United States
- Category: AI Developer Platforms
- Pricing: Free and open source
- Available on: API, Web
- Website: langchain.com

## Key features

- Open-source LLM framework
- LangGraph for agents
- LangSmith tracing and evaluation
- Many integrations
- Python and JavaScript

## Best for

- Developers building AI apps
- Agent builders
- Teams monitoring AI quality

## Alternatives

- [OpenAI API](https://trustkite.com/review/openai-api/): API access to OpenAI's GPT, image, speech and realtime models.
- [Claude Developer Platform](https://trustkite.com/review/claude-developer-platform/): API access to Anthropic's Claude models for building AI products.
- [Google AI Studio](https://trustkite.com/review/google-ai-studio/): Prototype and build with Google's Gemini models.
- [xAI API](https://trustkite.com/review/xai-api/): API access to xAI's Grok models.
- [Mistral AI](https://trustkite.com/review/mistral-ai/): Open and commercial language models with a developer platform.
- [Cohere](https://trustkite.com/review/cohere/): Enterprise language models for search, retrieval and agents.

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