The strongest open-source alternatives to Mem0 for building AI agents — agent memory ranked by GitHub traction, each with a head-to-head.
Short answer: the closest alternative to Mem0 is Letta (MemGPT) (★ 24k), the most-starred agent memory; Zep are also strong.
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Mem0 (★ 63k) is A memory layer for AI agents — extracts, stores, and retrieves user/agent facts across sessions. If it is not the right fit, these 2 agent memory cover the same ground — Letta (MemGPT) is the most-starred option below. Or browse the best agent memory and Mem0's own page.
Stateful agents with long-term memory and self-editing context, evolved from the MemGPT research. Best for persistent agents.
Long-term memory store for agents with a temporal knowledge graph of facts and their validity over time. Best for temporal memory.
Letta (MemGPT) (★ 24k) is the most-starred agent memory alternative to Mem0. Stateful agents with long-term memory and self-editing context, evolved from the MemGPT research.
The strongest agent memory alternatives to Mem0 are Letta (MemGPT), Zep — each with a head-to-head comparison.
Yes — the alternatives listed are open source and free to self-host; you bring your own model keys.
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