Color Converter API

Convert colors between HEX, RGB, HSL and CMYK, get complementary, analogous, triadic palettes, shades and tints, the best text color and WCAG contrast ratio.

Authentication & base URL

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Endpoints

GET `/v1/color`

Color info

Parameter	In	Description	Example
`color` *	query	hex, rgb() or hsl()	`ff8800`
`compare`	query	Second color for contrast	`ffffff`

Example

GET /v1/color?color=ff8800&compare=ffffff

{
  "hex": "#ff8800",
  "rgb": {
    "r": 255,
    "g": 136,
    "b": 0
  },
  "hsl": {
    "h": 32,
    "s": 100,
    "l": 50
  },
  "cmyk": {
    "c": 0,
    "m": 47,
    "y": 100,
    "k": 0
  },
  "luminance": 0.3887,
  "bestTextColor": "#000000",
  "palettes": {
    "complementary": [
      "#0077ff"
    ],
    "analogous": [
      "#ff0800",
      "#f6ff00"
    ],
    "triadic": [
      "#00ff88",
      "#8800ff"
    ],
    "shades": [
      "#cc6d00",
      "#995200",
      "#663600",
      "#331b00"
    ],
    "tints": [
      "#ffa033",
      "#ffb866",
      "#ffcf99",
      "#ffe7cc"
    ]
  },
  "contrast": {
    "with": "#ffffff",
    "ratio": 2.39,
    "AA": false,
    "AALarge": false,
    "AAA": false
  }
}

Convert colors between HEX, RGB, HSL and CMYK, get complementary, analogous, triadic palettes, shades and tints, the best text color and WCAG contrast ratio.

Use cases

Design tools, theme generators, accessibility checks (WCAG AA/AAA), branding apps, print preparation (CMYK).

Why this API

Fast: runs on a global edge network, typical response well under 1 second.
Reliable: simple JSON, clear error messages.
Fair pricing: Free plan 500 requests/month, Pro 25,000 for $4.99, Ultra 150,000 for $14.99.

Pricing

Free plan with 500 calls per month, then Pro (25,000 calls for $4.99/month) and Ultra (150,000 calls for $14.99/month). See all plans.