Color Toolkit API

Convert colors (hex/RGB/HSL/HSV/CMYK), check WCAG contrast, and generate palettes — pure & fast.

Color Toolkit is a pure-math color API — no keys, no data sources, instant responses. Parse any hex, rgb(), hsl(), or CSS named color and get it back in every format (hex, RGB, HSL, HSV, CMYK).

It also computes WCAG 2.x contrast ratios with AA/AAA pass-fail (great for accessibility), and generates complementary, analogous, triadic, tetradic, and monochromatic palettes. Perfect for design tools, theme builders, accessibility checkers, and data-viz.

Step-by-step tutorial: WCAG Contrast Checker API: Ratios, AA/AAA, and Color Conversion

Endpoints

Quick start

curl --url 'https://color-toolkit.p.rapidapi.com/contrast?foreground=%23777777&background=%23ffffff' \
  --header 'X-RapidAPI-Key: YOUR_KEY' \
  --header 'X-RapidAPI-Host: color-toolkit.p.rapidapi.com'

const res = await fetch('https://color-toolkit.p.rapidapi.com/contrast?foreground=%23777777&background=%23ffffff', {
  headers: {
    'X-RapidAPI-Key': 'YOUR_KEY',
    'X-RapidAPI-Host': 'color-toolkit.p.rapidapi.com'
  }
});
const data = await res.json();

{
  "foreground": "#777777",
  "background": "#ffffff",
  "ratio": 4.48,
  "aa": {
    "normalText": false,
    "largeText": true
  },
  "aaa": {
    "normalText": false,
    "largeText": false
  }
}

Pricing

Subscribe on RapidAPI. Start free; upgrade as you scale.

For AI agents

Programmatic discovery and keyless testing:

• OpenAPI spec: https://abundanceapis.com/openapi/color-toolkit.json
• MCP server (keyless trial): https://abundanceapis.com/mcp — add this Streamable-HTTP MCP endpoint in Claude, Cursor, or any MCP client, then call list_apis and the sample tools.
• Production: subscribe on RapidAPI and send X-RapidAPI-Key + X-RapidAPI-Host: color-toolkit.p.rapidapi.com.