Memory & Context
Alternatives to Letta
4 memory & context tools you can use instead of Letta, 2 of them open source. Summaries come from each vendor's own site. Links checked Oct 16, 2026.
At a glance
Letta alternatives compared
| Tool | What it does | Open source | Head to head |
|---|---|---|---|
| Cognee | Open-source agent memory platform built on graph and vector stores. | Yes | Letta vs Cognee |
| Mem0 | Memory layer that lets agents learn from past interactions. | Yes | Letta vs Mem0 |
| Supermemory | Memory and continual learning engine for agents. | No | Letta vs Supermemory |
| Zep | Context layer that unifies business data, documents, and chats for agents. | No | Letta vs Zep |
Memory & Context
All 4 alternatives
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Cognee
cognee.aiOpen-source agent memory platform built on graph and vector stores.
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Mem0
mem0.aiMemory layer that lets agents learn from past interactions.
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Supermemory
supermemory.aiMemory and continual learning engine for agents.
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Zep
getzep.comContext layer that unifies business data, documents, and chats for agents.
FAQ
Questions
What are the alternatives to Letta?
Agent Stack Directory lists 4 other memory & context tools: Cognee, Mem0, Supermemory, Zep.
Is there an open-source alternative to Letta?
Yes. Among the alternatives we list, these are marked open source: Cognee, Mem0.
What does Letta do?
Platform for stateful agents that keep long-term memory. (Summary based on letta.com, link checked 2026-10-16.)