Magic MCP vs Ontomics

In-depth architectural comparison of the Magic MCP and Ontomics 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 Magic MCP when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: API Key required (Paid Service).
• You have access to required keys: TWENTY_FIRST_API_KEY, API_KEY_21ST.
• Primary tools included: UI component generation, Component, theme, and template search, Design inspiration lookup.

Explore Magic MCP Details

Choose Ontomics when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: Semantic concept and vocabulary indexing, Naming convention detection and suggestions, Behavioral similarity search for functions.

Feature & Specification Comparison

Specification	Magic MCP 21st-dev Developer Tools	Ontomics EtienneChollet Developer Tools
Summary	Create crafted UI components inspired by the best 21st.dev design engineers.	Semantic code index that extracts domain concepts, naming conventions, and behavioral similarity from codebases. One tool call instead of 19, 20x fewer tokens for codebase understanding queries.
Category & Scope	Developer Tools

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": {
    "21st-dev-magic-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@21st-dev/cli@latest"
      ],
      "env": {
        "TWENTY_FIRST_API_KEY": "YOUR_TWENTY_FIRST_API_KEY_HERE",
        "API_KEY_21ST": "YOUR_API_KEY_21ST_HERE"
      }
    }
  }
}

{
  "mcpServers": {
    "etiennechollet-ontomics": {
      "command": "npx",
      "args": [
        "-y",
        "@ontomics/ontomics"
      ]
    }
  }
}

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