Mem0, Letta, Zep — Memory Frameworks

Mem0 (formerly Embedchain): auto-extracts facts from each conversation, user-scoped memory store. Remembers structured things like "user prefers Italian food".

Letta (formerly MemGPT): OS-inspired memory hierarchy — main context (RAM), recall storage (disk), archival storage (long-term). Model reads/writes its own "memory pages".

Zep: chat-focused; extracts entities + relationships from each message → temporal knowledge graph. Strong on temporal questions like "the marathon I finished last month".

All have API + self-host. For production agents, pick one instead of rolling your own memory.