LangMem vs mem0
A side-by-side comparison of LangMem and mem0, two Memory tools, drawn from Ignaite's continuously-verified listings.
Compared from listings verified as of
At a glance
| Attribute | LangMem | mem0 |
|---|---|---|
| Category | Memory | Memory |
| Pricing (differs) | FREE | FREEMIUM |
| License (differs) | Open source | Open core |
| Deployment (differs) | — | Hybrid |
| Platforms | API, CLI | API, CLI |
| Model support | BYO key / model | BYO key / model |
| Vendor (differs) | LangChain | Mem0 |
| Capabilities (differs) |
|
|
The honest brief
LangMem
Backed by LangChain, its memory tools plug straight into LangGraph rather than running as a standalone store.
- Semantic, episodic, procedural memory
- Storage- and framework-agnostic core API
- Native LangGraph integration
- MIT-licensed and free
- Most value inside the LangChain stack
- Young SDK, evolving API
- You wire up your own storage layer
mem0
Fastest path to agent memory — extracts distilled facts with a tiny token footprint and the biggest community.
- Quick to adopt, broad framework integrations
- Stores distilled facts, small footprint
- Vector + graph + key-value storage
- Open-source with usable free tier
- Weaker on temporal/state-change queries
- LLM call on every write adds latency
- Test deletion/conflict handling for regulated use
- More library than full memory server
When to pick which
Both cover Agent memory.
Pick LangMem if you need Prompt management.
- Prompt management (secondary capability)
Pick mem0 if you need MCP server and Vector search.
- MCP server (secondary capability)
- Vector search (secondary capability)
They also differ on:
- Pricing
- FREE · FREEMIUM
- License
- Open source · Open core