Model
Freemium
LangChain
LangChain is the popular open-source framework for building LLM apps with chains, agents, retrieval, and observability via LangSmith.
Pricing
Freemium
Popularity
193
Starts at
Free
Free tier
Yes
API
Yes
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langchain.com
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LA
LangChain
Framework for LLM applications
Freemium
LCEL chains
Agents
RAG tooling
LangSmith
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Key information
Pricing & details
Snapshot from our listing — always confirm on the official site.
Starting at
Free
Free tier
Yes
API
Available
Open source
Yes
Platforms
python · javascript · API
Capabilities
Key features
What stands out when you evaluate LangChain.
- LCEL chains
- Agents
- RAG tooling
- LangSmith
- LangGraph
Quick take
Best for
When LangChain tends to make the shortlist.
- LCEL chains
- Agents
- RAG tooling
- LangSmith
- Freemium pricing with a free tier listed
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Overview
About LangChain
Framework for LLM applications
Updated 2026-07-21
LangChain is the popular open-source framework for building LLM apps with chains, agents, retrieval, and observability via LangSmith.
Decision guide
Pros & cons
Signals from our listing for LangChain.
Pros
- Free tier listed
- Public API listed
- Open source
- LCEL chains
- Agents
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