20 AI agent memory tools to know in 2026, sorted into five selection categories
MaryamMiradi · x · 2026-10-09
A curated rundown of 20 open-source tools for AI agent memory, grouped by use case:
- Dedicated memory: Mem0, Letta, Cognee, Graphiti (temporal knowledge graphs for changing facts)
- Framework memory: LangGraph, LlamaIndex, CrewAI, Agno
- Vector memory: Qdrant, Weaviate, Milvus, Chroma
- Graph + state: Zep, Neo4j, Redis, SurrealDB
- Specialists: Semantic Kernel, Haystack, AutoGen, FAISS
The author's core point: storing every past interaction is not useful memory—production agents need to remember the right thing, at the right time, with the right scope. A benchmark of Mem0 vs Cognee vs Letta vs Hindsight vs Graphiti vs LangGraph Memory may follow.
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