Mem0 vs Letta
Verdict: in our “Best memory layer for agents” ranking, Mem0 ranks #1 and Letta ranks #2. The table compares their verified basics; how we rank.
| Feature | Mem0 | Letta |
|---|---|---|
| What it is | Memory layer for AI agents. | Platform for stateful agents with long-term memory (formerly MemGPT). |
| Category | Agent memory | Agent memory |
| Pricing model | open-source | open-source |
| Integrations | API, MCP | API |
| Self-hostable | Yes | Yes |
| Open-source repo | mem0ai/mem0 | letta-ai/letta |
| Rank in “Best memory layer for agents” | #1 | #2 |
| StackRank score | Not yet benchmarked | Not yet benchmarked |
| Last verified | Oct 14, 2026 | Oct 14, 2026 |
Try them
Platform for stateful agents with long-term memory (formerly MemGPT).
Agent memoryopen-source