LangChain is the leading open-source framework and platform for building LLM-powered applications, providing tools for chains, agents, retrieval-augmented generation, and production observability via LangSmith.
Pricing
$0-39 / seat / month
Reviews
2,000+
Founded
2022
Team Size
51-200 employees
Current Deal
4 months free for startups
About LangChain
LangChain is the most widely adopted framework for building applications powered by large language models. The open-source library provides composable building blocks for chains, agents, retrieval-augmented generation (RAG), and tool-using AI applications.
LangSmith, the commercial platform, provides observability, testing, and evaluation tools for LLM applications in production. Teams use LangSmith to trace requests through complex chains, evaluate output quality, and debug issues in their AI applications.
LangGraph extends the framework with support for stateful, multi-actor AI agent workflows. Together, these tools form a comprehensive platform for the entire LLM application lifecycle from prototyping to production deployment and monitoring.
Pricing
$0-39 / seat / month
LangChain (open-source): Free, MIT licensed
LangSmith Developer: Free - 5K traces/month
LangSmith Plus: $39/seat/month - 200K traces, enhanced features
Enterprise: Custom - SSO, SLA, dedicated support
