What is LangChain?
LangChain is a popular open-source framework for building LLM applications and agents, with LangGraph for stateful agent orchestration and LangSmith for tracing and evaluation.
Best for: AI engineers, Developers.
Key features
- LangChain library
- LangGraph
- LangSmith observability
- Integrations
- Agent deployment
Pros and cons
Pros
- Huge integration ecosystem
- Large community
Cons
- Abstractions can feel heavy
- Frequent API changes
LangChain pricing
| Pricing model | Open source |
|---|---|
| Starting price | Free |
| Platforms | API, Web |
| Launched | 2022 |
Prices change often. Check the LangChain website for current plans.
Our verdict
LangChain scores 8.5/10 in our review. Its biggest strength: huge integration ecosystem. The main drawback: abstractions can feel heavy. If it isn't the right fit, OpenAI API is the closest alternative.
LangChain compared
Frequently asked questions
What is LangChain?
LangChain is a popular open-source framework for building LLM applications and agents, with LangGraph for stateful agent orchestration and LangSmith for tracing and evaluation.
Is LangChain free?
Yes. LangChain is open source and free to use.
What are the best LangChain alternatives?
Popular alternatives include OpenAI API, Zapier, Claude Code, Anthropic API.
Who is LangChain best for?
LangChain is best for ai engineers, developers.