LangChain
What is LangChain?
Frameworks and tools for building LLM apps and agents.
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 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
Key facts
- Founded
- 2022
- Based in
- United States
- Category
- AI Developer Platforms
- Pricing
- Free and open source
- Available on
- API, Web
- Website
- langchain.com
Compiled by TrustKite from public information. Last updated 24 October 2026. Own this business? Claim it to edit these details.
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What is 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. Its main features include: Open-source LLM framework; LangGraph for agents; LangSmith tracing and evaluation; and Many integrations.
Who is LangChain for?
LangChain is a good fit for: Developers building AI apps; Agent builders; and Teams monitoring AI quality.
Is LangChain free?
LangChain is free and open source. Some providers offer paid hosted versions. Prices change often, so check the official website for current plans.
Where can I use LangChain?
LangChain is available on API and Web.
Where is LangChain based?
LangChain was founded in 2022 and is based in the United States.
What do customers say about LangChain?
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What are the alternatives to LangChain?
Popular alternatives to LangChain include OpenAI API, Claude Developer Platform, Google AI Studio and xAI API. Compare their scores and reviews below.
