LangChain
Open-source framework for building LLM-powered applications with chains, agents, and retrieval-augmented generation.
What is LangChain?
LangChain is the most popular open-source framework for developing applications powered by large language models. It provides tools for building chains, agents, RAG pipelines, and multi-step reasoning workflows, making it the go-to choice for AI developers.
Best for: Developers building LLM applications · Teams building RAG and agent systems · Startups prototyping AI features rapidly
Developer Stack Fit
Quick read on where LangChain fits in a software team's AI stack. Validate final fit against your codebase, data policy, and deployment model.
- Stack layer
- Agent Frameworks
- Deployment model
- Open-source deployable
- Open-source status
- Yes or source-available
- API support
- API or integration-friendly
- MCP support
- No MCP signal found
- Security posture
- Review vendor privacy and data retention
- Best use case
- Developers building LLM applications
Discovery graph
Featured in NeuralStackly paths
Product media
Interface proof
No verified product screenshots yet.
NeuralStackly keeps the page useful with pricing, stack-fit, alternatives, and launch-risk notes instead of fake interface previews.
Key Features
- 01
Chain and agent orchestration for LLM workflows
LLM chain and agent orchestration
- 02
Built-in RAG (Retrieval Augmented Generation) support
Built-in RAG pipeline support
- 03
100+ integrations with LLM providers and data sources
LangSmith tracing and debugging
- 04
LangSmith for tracing, debugging, and evaluation
A core developer-tools capability that teams use daily.
- 05
LangGraph for building stateful agent workflows
A core developer-tools capability that teams use daily.
- 06
Python and TypeScript/JavaScript support
A core developer-tools capability that teams use daily.
- 07
Extensive documentation and community
A core developer-tools capability that teams use daily.
Pros & Cons
What stands out
- Largest ecosystem of LLM integrations
- Active open-source community
- LangSmith debugging is excellent
- Both Python and TypeScript support
Watch outs
- Frequent API changes between versions
- Steep learning curve for agents
- Documentation sometimes lags behind releases
- Can be overkill for simple use cases
Pricing Plans
LangChain Pricing
Choose the perfect plan for your needs. All plans include our core features with different usage limits and advanced capabilities.
LangSmith (Pro)
0 day free trial • No credit card required
LangSmith Team
0 day free trial • No credit card required
Need a Custom Solution?
Looking for enterprise features or custom pricing? Contact LangChain directly for tailored solutions.
Contact SalesMost teams land on the LangSmith (Pro) plan.
Alternatives
FAQ
What is LangChain and how does it work?
LangChain is a developer-tools tool that open-source framework for building llm-powered applications with chains, agents, and retrieval-augmented generation.. It uses AI to help users improve productivity through analyzing input and generating relevant output.
How much does LangChain cost?
LangChain starts at $0/month. They offer a free trial so you can test it before committing.
Does LangChain have a free trial?
Yes — Free to try with no time limit.
What can LangChain do?
More developer-tools Tools
Algolia
AI-powered search and discovery platform that delivers lightning-fast, relevant search results for websites and apps.
Vercel AI SDK
Open-source SDK for building AI-powered web applications with streaming, tool calling, and multi-provider support.
Postman
AI-enhanced API platform for building, testing, documenting, and sharing APIs with intelligent code generation.
Affiliate Disclosure: We may earn a commission when you purchase through links on our site. This doesn't affect our editorial independence or the price you pay.
LangChain
Free to start