LangMem is completely free with 4 features included. No paid tiers offered, making it perfect for budget-conscious users.
LangChain's older memory (ConversationBufferMemory, etc.) was simple session-level context management. LangMem is a full memory formation system with extraction, classification, and cross-session persistence. It's designed for LangGraph and supports semantic, episodic, and procedural memory types.
Technically the memory extraction functions can be used standalone, but the storage and retrieval system is designed around LangGraph's store. Without LangGraph, you lose the native integration benefits and would need to provide your own storage backend.
Mem0 is a standalone memory service with its own storage and API. LangMem is a library that integrates with LangGraph's architecture. Mem0 is more mature and framework-agnostic. LangMem is better if you're building with LangGraph and want memory as a native part of your graph.
It's usable but still maturing. APIs may change between versions, documentation is evolving, and production case studies are limited. For production LangGraph applications, it works, but plan for potential migration effort as the library stabilizes.
It's completely free — no credit card required.
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Last verified March 2026