Open Zk Kb vs JustOnce

In-depth architectural comparison of the Open Zk Kb and JustOnce 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 Open Zk Kb 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 Open Zk Kb Details

J

Choose JustOnce 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 JustOnce Details

Feature & Specification Comparison

Specification	Open Zk Kb Knowledge & Memory	J JustOnce Knowledge & Memory
Summary	Shared, persistent memory for AI assistants, built on the Zettelkasten method.	Persistent memory for AI assistants — one shared, OAuth-secured vault for every MCP client.
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": {
    "open-zk-kb": {
      "command": "bunx",
      "args": [
        "open-zk-kb@latest"
      ]
    }
  }
}

{
  "mcpServers": {
    "justonce": {
      "command": "npx",
      "args": [
        "-y",
        "justonce"
      ]
    }
  }
}

Related MCP Server Comparisons