M3 Memory vs Memento

In-depth architectural comparison of the M3 Memory and Memento MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

M

Choose M3 Memory when:

• You need dedicated capabilities in the Knowledge & Memory domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore M3 Memory Details

Choose Memento when:

• You need dedicated capabilities in the Knowledge & Memory domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Memento Details

Feature & Specification Comparison

Specification	M M3 Memory Knowledge & Memory	Memento Knowledge & Memory
Summary	Local-first agentic memory — 100+ tools, 92% LongMemEval-S, hybrid search, GDPR, zero cloud.	Persistent memory for AI tools. Local-first knowledge graph with hybrid search.
Category & Scope	Knowledge & Memory	Knowledge & Memory
Quality signal

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "m3-memory": {
      "command": "uvx",
      "args": [
        "m3-memory"
      ]
    }
  }
}

{
  "mcpServers": {
    "memento-3": {
      "url": "https://img.shields.io/badge/version-v0.1.0--alpha-orange)](CHANGELOG.md"
    }
  }
}

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