Letta vs Zep vs Supermemory
Side by side, from each listing’s own data. A row where every column says the same is shown once, dimmed.
 Lettaby LettaRemove Letta from this comparison |  Zepby ZepRemove Zep from this comparison |  Supermemoryby SupermemoryRemove Supermemory from this comparison | |
|---|---|---|---|
| Sets it apart |
| — |
|
| What it is | Stateful agent framework with built-in memory. Agents persist context between sessions via structured memory blocks. Formerly MemGPT. Self-hosted or managed cloud. | Long-term memory store for AI assistants. Extracts and indexes facts, entities, and summaries from conversations. Fast hybrid search combines semantic and full-text retrieval. | Memory API for AI applications. Store and retrieve user memories, bookmarks, and knowledge with semantic search. One unified API for personal and enterprise memory. |
| Provider | Letta | Zep | Supermemory |
| Official vendor | Not an official listingSame for all | ||
| Verified | YesSame for all | ||
| Access | API, CLI | API | API, MCP |
| Auth | API KeySame for all | ||
| MCP server | No MCP server | No MCP server | In its setup guide |
| CLI install | In its docs | No CLI | No CLI |
| API base URL | In its docsSame for all | ||
| Skills | Persist agent state between sessions using structured in-context memory blocks, Dynamically edit and archive memory to maintain coherent long-horizon agent behavior, Orchestrate multi-agent pipelines where agents pass typed memory between each other, Execute tool calls with full persistence of tool outputs across sessions, Deploy self-hosted or cloud agents with consistent stateful behavior at scale | Auto-extract facts, entities, and summaries from raw conversation transcripts, Track entity relationships and state changes across long multi-session interactions, Temporal memory management that weights recency and relevance for retrieval, Hybrid search combining dense semantic vectors and full-text BM25 scoring, Retrieve cross-session context in a single API call for any user or thread | Ingest memories from any source via a unified memory ingestion pipeline, Semantic retrieval of relevant memories ranked by context similarity, Build shared knowledge bases accessible across teams and agent instances, Store multiple content formats including text, URLs, and structured data, Collaborate on shared memory spaces with role-based access control |
| Streaming | Yes | No | No |
| Push notifications | NoSame for all | ||
| Categories | Memory & StateSame for all | ||
| Tags | memory, stateful-agents, memgpt, open-source, self-hosted, python, orchestration | memory, long-term-memory, llm, conversation-history, knowledge-graph | memory, knowledge-base, rag, semantic-search, open-source |
| Listed since | Apr 8, 2026Same for all | ||
| Use it now | |||
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