Which is more popular, LangChain or LEANN?

LangChain has more GitHub stars (147,320 vs 12,994).

Which is more actively developed, LangChain or LEANN?

LangChain had more commits in the last 90 days (511 vs 34).

Should I use LangChain or LEANN?

Compare their capabilities, limitations and "best for" notes above. Both are open source, so trying each on a small task is the fastest way to decide.

LangChain vs LEANN

Side-by-side comparison of two AI agent tools

LangChainopen-source

The agent engineering platform

LEANNopen-source

[MLsys2026 Best Paper]: https://arxiv.org/abs/2506.08276. RAG on Everything with LEANN. Enjoy 97% storage savings while running a fast, accurate, and 100% priva

Metrics

	LangChain	LEANN
Stars	147.3k	13.0k
Star velocity /mo	23.5k	1.1k
Commits (90d)	511	34
Releases (6m)	10	1
Overall score	0.9032159518953914	0.634243891005486

Pros

+Extensive ecosystem with seamless integration between LangGraph, LangSmith, and hundreds of third-party components
+Future-proof architecture that adapts to evolving LLM technologies without requiring application rewrites
+Strong community support with 131k+ GitHub stars and comprehensive documentation for both Python and JavaScript

Cons

-Significant learning curve due to the framework's extensive feature set and multiple abstraction layers
-Potential over-engineering for simple use cases that might be better served by direct API calls
-Heavy dependency on the LangChain ecosystem which can create vendor lock-in concerns

Use Cases

•Building complex multi-agent systems that require planning, tool use, and coordination between different AI components
•Creating production LLM applications with observability, debugging, and deployment infrastructure via LangSmith
•Developing chatbots and conversational AI with memory, context management, and integration with external data sources

View LangChain Details View LEANN Details

FAQ

Which is more popular, LangChain or LEANN?: LangChain has more GitHub stars (147,320 vs 12,994).
Which is more actively developed, LangChain or LEANN?: LangChain had more commits in the last 90 days (511 vs 34).
Should I use LangChain or LEANN?: Compare their capabilities, limitations and "best for" notes above. Both are open source, so trying each on a small task is the fastest way to decide.