Nexus Catalyst vs Kairn

In-depth architectural comparison of the Nexus Catalyst and Kairn 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?

N

Choose Nexus Catalyst 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 Nexus Catalyst Details

Choose Kairn 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 Kairn Details

Feature & Specification Comparison

Specification	N Nexus Catalyst Knowledge & Memory	Kairn Knowledge & Memory
Summary	Cross-tool persistent memory and context for AI assistants over MCP.	Local-first knowledge engine for AI agents: memory, graph, and recall over MCP.
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": {
    "nexus-catalyst": {
      "command": "npx",
      "args": [
        "-y",
        "nexus-catalyst"
      ]
    }
  }
}

{
  "mcpServers": {
    "kairn": {
      "command": "uvx",
      "args": [
        "kairn-ai"
      ]
    }
  }
}

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