Memory vs Cal MCP

In-depth architectural comparison of the Memory and Cal MCP 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?

Choose Memory when:

• You need dedicated capabilities in the Other Tools and Integrations domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: Knowledge graph-based data storage, Persistent memory for LLMs, Reference implementation for MCP SDK usage.

Explore Memory Details

Choose Cal MCP when:

• You need dedicated capabilities in the Other Tools and Integrations domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: MCP tool named cal, String expression input through exp, Arithmetic evaluation with expr-eval.

Explore Cal MCP Details

Feature & Specification Comparison

Specification	Memory VerifiedOther Tools and Integrations	Cal MCP pwh-pwh Other Tools and Integrations
Summary	Knowledge graph-based persistent memory system.	An MCP server for Mathematical expression calculation
Category & Scope	Other Tools and Integrations

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": {
    "memory": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-memory"
      ]
    }
  }
}

{
  "mcpServers": {
    "pwh-pwh-cal-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@smithery/cli"
      ]
    }
  }
}

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