MCP Mermaid 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.

	MCP Mermaid Generate Mermaid diagrams and charts with AI dynamically, exporting to SVG, PNG, base64, file, or shareable URLs. 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	588	5.2k
Last commit	1 month ago	4 months ago
Verified
Actively maintained
Install	`npx -y mcp-mermaid`	`npx @21st-dev/cli@latest install <client> --api-key <key>`
Repo	Open	Open

Verdict

Pick MCP Mermaid 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 MCP Mermaid

Install / run

npx -y mcp-mermaid

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

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

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

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

Pick MCP Mermaid 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 MCP Mermaid 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 MCP Mermaid 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 MCP Mermaid →View 21st.dev Magic MCP →More comparisons →