21st.dev Magic MCP vs Claude Mermaid MCP Server

A side-by-side comparison of two Design & Media servers — tools, transport, auth, maintenance, and copy-paste config for each.

	21st.dev Magic MCP Generate beautiful, modern UI components from natural-language descriptions inside your IDE. Unverified stdio (local) API key TypeScript	Claude Mermaid MCP Server Render Mermaid diagrams in Claude Code with live-reload browser preview and SVG/PNG/PDF export. Unverified stdio (local) No auth TypeScript
Category	Design & Media	Design & Media
Language	TypeScript	TypeScript
Transport	stdio (local)	stdio (local)
Auth	API key	None
GitHub stars	5.2k	170
Last commit	5 months ago	1 month ago
Verified
Actively maintained
Install	`npx @21st-dev/cli@latest install <client> --api-key <key>`	`npm install -g claude-mermaid`
Repo	Open	Open

Verdict

Pick 21st.dev Magic MCP if you want the official, vendor-maintained server, and you prefer the more popular, battle-tested option.

Pick Claude Mermaid MCP Server if you want zero-setup with no API key.

Add 21st.dev Magic MCP

Install / run

npx @21st-dev/cli@latest install <client> --api-key <key>

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "21st-dev-magic-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@21st-dev/magic@latest",
        "API_KEY=\"your-api-key\""
      ]
    }
  }
}

Add Claude Mermaid MCP Server

Install / run

npm install -g claude-mermaid

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "claude-mermaid-mcp-server": {
      "command": "claude-mermaid",
      "args": []
    }
  }
}

FAQ

21st.dev Magic MCP or Claude Mermaid MCP Server — which is better?

Pick 21st.dev Magic MCP if you want the official, vendor-maintained server, and you prefer the more popular, battle-tested option. Pick Claude Mermaid MCP Server if you want zero-setup with no API key.

Can I use both 21st.dev Magic MCP and Claude Mermaid MCP Server?

Yes — MCP clients let you enable multiple servers at once. Add both configs to your client's mcpServers and use whichever tool fits the task.

Do 21st.dev Magic MCP and Claude Mermaid MCP Server work with Claude, Cursor and Windsurf?

Both do. Copy the per-client config below into Claude Desktop, Cursor, or Windsurf.

View 21st.dev Magic MCP →View Claude Mermaid MCP Server →More comparisons →