Color Contrast MCP tool

MCP findutils:color_contrast

Compute the WCAG 2.1 contrast ratio between two colours (accepts #rgb, #rrggbb, and rgb()/rgba() formats) and report whether it passes AA/AAA for normal and large text.

Needs an API key. Running a tool needs an API key. Keys are not for sale yet: ask for early access. About API keys

Open the tool Try it

Arguments

application/json

foreground

string required

Foreground / text colour.
background

string required

Background colour.

Example arguments

Verified

{
  "foreground": "#000",
  "background": "#fff"
}

claude mcp add findutils --transport http https://mcp.findutils.com/ --header "Authorization: Bearer YOUR_API_KEY"

{
  "mcpServers": {
    "findutils": {
      "url": "https://mcp.findutils.com/",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}

curl -X POST https://mcp.findutils.com/ \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "color_contrast",
      "arguments": {
        "foreground": "#000",
        "background": "#fff"
      }
    }
  }'

Also a REST endpoint

The same tool answers plain HTTP at POST /api/tools/color-contrast/execute.

REST reference

Rate limit: 120 a minute, per IP
Auth: API key
REST id: color-contrast
MCP name: color_contrast
Category: Developer
Machine-readable: openapi.json · markdown.md

Arguments

Example arguments

More Developer tools

More to explore