LangChain
✓ VerifiedOpen-source framework for LLM apps with LangSmith observability
About
LangChain is an open-source framework for building LLM apps with composable chains, agents, tools, and RAG. It supports Python and TypeScript, integrates with major model providers and vector stores, and pairs with LangSmith for tracing, monitoring, and evals.
Key Features
- ✓Composable chains for multi-step workflows
- ✓Agent framework with tool use
- ✓RAG (Retrieval Augmented Generation)
- ✓Memory and retrieval for RAG
- ✓Multi-model/provider support
- ✓LangSmith tracing, monitoring, and evals
- ✓LangGraph for stateful agents
- ✓Extensive integrations ecosystem
Pros & Cons
Pros
- Open-source framework for chains, agents, RAG, and tools
- LangSmith tracing, monitoring, and evals for production
- 100+ integrations with model providers and vector stores
Cons
- Python/TypeScript only; no other language SDKs
- Paid LangSmith tiers for team features
Use Cases
- →RAG applications with document Q&A
- →Multi-agent systems
- →Chatbots with memory
- →Tool-using AI agents
- →Complex AI workflows
- →Production LLM applications
Technical Details
Languages
AI Models
Integrations
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Frequently Asked Questions
What is LangChain?
LangChain is an open-source framework for building LLM apps with composable chains, agents, tools, and RAG. It supports Python and TypeScript, integrates with major model providers and vector stores, and pairs with LangSmith for tracing, monitoring, and evals.
Is LangChain free?
Yes, LangChain is open source and free to use. Full framework access, All components, Community support
What programming languages does LangChain support?
LangChain supports 2+ programming languages including Python, JavaScript/TypeScript.
What AI models does LangChain use?
LangChain is powered by Any LLM via unified interface.
What platforms does LangChain support?
LangChain is available on All platforms.
What can LangChain do?
LangChain provides AI chat, agentic/autonomous mode. Key features include: Composable chains for multi-step workflows, Agent framework with tool use, RAG (Retrieval Augmented Generation).
Pricing and features change frequently—confirm on the vendor site.
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Pricing
Free (Open Source)
$0
- Full framework access
- All components
- Community support
- Production use
LangSmith Developer
Free (1 seat, 5k traces/month included)
- Tracing and monitoring
- Evals (online/offline)
- Dataset collection and annotation queue
- Dev deployment included
LangSmith Plus
$39/user/month (up to 10 seats, 10k traces/month included)
- Everything in Developer
- Team seats (up to 10)
- Deployments with agent runs and uptime billing
LangSmith Enterprise
Contact sales
- Custom seats and limits
- Enterprise support and security
Company
- Name
- LangChain (Harrison Chase)
- Founded
- 2022
- Location
- San Francisco, CA
- Users
- Hundreds of thousands of developers
Links
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