Claude Mermaid MCP Server vs 21st.dev Magic MCP

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

	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	21st.dev Magic MCP Generate beautiful, modern UI components from natural-language descriptions inside your IDE. Unverified stdio (local) API key TypeScript
Category	Design & Media	Design & Media
Language	TypeScript	TypeScript
Transport	stdio (local)	stdio (local)
Auth	None	API key
GitHub stars	170	5.2k
Last commit	1 day ago	4 months ago
Verified
Actively maintained
Install	`npm install -g claude-mermaid`	`npx @21st-dev/cli@latest install <client> --api-key <key>`
Repo	Open	Open

Verdict

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

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

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": []
    }
  }
}

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\""
      ]
    }
  }
}

FAQ

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

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

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

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

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

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