Magic MCP vs BMI Kit
A side-by-side look at the Magic MCP and BMI Kit MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
B
BMI KitDeveloper Tools · Remote HTTP/SSEBody composition for AI: BMI, body fat, FFMI, waist-to-height, plus saved measurement trends.42FairAuth: not declaredVerdict: choose Magic MCP for architecture & design work as a local process; choose BMI Kit for developer tools over a hosted endpoint. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Magic MCP when
- You need dedicated capabilities in the Architecture & Design domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You have the keys it needs:
TWENTY_FIRST_API_KEY, API_KEY_21ST.
BChoose BMI Kit when
- You need dedicated capabilities in the Developer Tools domain.
- You prefer a remote HTTP/SSE transport.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | B BMI Kit | |
|---|---|---|
| Category | Architecture & Design | Developer Tools |
| Quality signal | 53/100 · Good | 42/100 · Fair |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Remote HTTP/SSE |
| Auth | API key required | Not declared |
| Pricing | Paid service | Not declared |
| Required env vars | TWENTY_FIRST_API_KEYAPI_KEY_21ST | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 6,193 | — |
| Directory activity | 16 views 1 installs 0 upvotes | 1 views 0 installs 0 upvotes |
| Tools | Not listed | Not listed |
| Full listing | View Magic MCP | View BMI Kit |
Tools & capabilities
Magic MCP tools
No tool names declared yet. Check the project README from the listing page.
BMI Kit tools
No tool names declared yet. Check the project README from the listing page.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Magic MCP
{
"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"
}
}
}
}
BMI Kit
{
"mcpServers": {
"bmi-kit-2": {
"url": "https://bmikit.com/mcp"
}
}
}
Frequently asked questions
Magic MCP is categorized under Architecture & Design and uses a local stdio subprocess. BMI Kit belongs to Developer Tools and uses a remote HTTP/SSE transport. Pick Magic MCP for architecture & design work and BMI Kit for developer tools.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Magic MCP is listed as a paid service. Auth: api key required. BMI Kit has no declared pricing — check the project's own site. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add 21st-dev-magic-mcp and bmi-kit-2 as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Magic MCP has a quality signal of 53/100 (Good) with 16 views, 1 installs and 6,193 GitHub stars. BMI Kit has 42/100 (Fair) with 1 views, 0 installs and 0 GitHub stars.