LanceDB vs Letta vs Milvus
Side by side, from each listing’s own data. A row where every column says the same is shown once, dimmed.
 LanceDBby LanceDBRemove LanceDB from this comparison |  Lettaby LettaRemove Letta from this comparison |  Milvusby ZillizRemove Milvus from this comparison | |
|---|---|---|---|
| Sets it apart |
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| What it is | Stores and searches multimodal vectors in an embedded database built on the Lance columnar format, running in-process or against LanceDB Cloud. | Stateful agent framework with built-in memory. Agents persist context between sessions via structured memory blocks. Formerly MemGPT. Self-hosted or managed cloud. | High-performance open-source vector database with REST API, gRPC, and an official MCP server. Stores billions of vectors for semantic search, RAG, and agent memory. |
| Provider | LanceDB | Letta | Zilliz |
| Official vendor | Not an official listingSame for all | ||
| Verified | YesSame for all | ||
| Access | API | API, CLI | API, MCP, CLI |
| Auth | API KeySame for all | ||
| MCP server | No MCP server | No MCP server | In its setup guide |
| CLI install | No CLI | In its docs | In its docs |
| API base URL | In its docsSame for all | ||
| Skills | Vector Search, Multimodal Storage, Hybrid Retrieval | 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 | Vector Similarity Search, Hybrid Search, MCP Integration |
| Streaming | No | Yes | No |
| Push notifications | NoSame for all | ||
| Categories | Vector Databases, Memory & State | Memory & State | Vector Databases |
| Tags | vector-search, embedded-database, lance-format, multimodal-retrieval, columnar-storage, hybrid-search | memory, stateful-agents, memgpt, open-source, self-hosted, python, orchestration | vector-database, semantic-search, rag, mcp-server, embeddings, billion-scale, agent-memory |
| Listed since | Sep 2, 2026 | Apr 8, 2026 | May 13, 2026 |
| Use it now | |||
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