Generate WCAG-Safe Color Palettes in 1 API Call — Free Accessibility Tool (2026)

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Free Color Palette Generator API - Create Harmonious Colors & WCAG Check

Choosing color palettes is hard. You need colors that look good together, meet accessibility standards, and match your brand. Tools like Adobe Color Wheel help visually, but integrating them into your workflow is slow. What if you could generate harmonious color palettes via REST API and automatically verify WCAG contrast compliance?

The Color Palette Generator API creates color schemes using design principles: complementary, analogous, triadic, tetradic, and monochromatic. It returns colors in multiple formats (HEX, RGB, HSL), generates gradients, and verifies WCAG AA/AAA contrast ratios for accessibility.

Why Use This API?

Generating accessible color schemes matters:

• Web Design – Meet WCAG accessibility standards (AA/AAA)
• Brand Design – Generate harmonious palettes from a single color
• Data Visualization – Create distinguishable color schemes for charts
• Automation – Dynamically generate UI themes programmatically

Quick Example - cURL

# Generate a triadic palette from a base color
curl "https://color-palette-api.p.rapidapi.com/generate?base_color=FF5733&scheme=triadic" \
  -H "X-RapidAPI-Key: YOUR_KEY" \
  -H "X-RapidAPI-Host: color-palette-api.p.rapidapi.com"

Response:

{
  "success": true,
  "base_color": "FF5733",
  "scheme": "triadic",
  "colors": [
    {
      "hex": "FF5733",
      "rgb": "rgb(255, 87, 51)",
      "hsl": "hsl(10, 100%, 60%)",
      "name": "Tomato Red"
    },
    {
      "hex": "33FF57",
      "rgb": "rgb(51, 255, 87)",
      "hsl": "hsl(130, 100%, 60%)",
      "name": "Emerald Green"
    },
    {
      "hex": "3357FF",
      "rgb": "rgb(51, 87, 255)",
      "hsl": "hsl(230, 100%, 60%)",
      "name": "Sapphire Blue"
    }
  ],
  "contrast": {
    "wcag_aa": true,
    "wcag_aaa": false,
    "luminance_ratios": [4.5, 5.2, 3.8]
  }
}

Python Example

import requests
import json

url = "https://color-palette-api.p.rapidapi.com/generate"
headers = {
    "X-RapidAPI-Key": "YOUR_API_KEY",
    "X-RapidAPI-Host": "color-palette-api.p.rapidapi.com"
}

# Generate brand color palette
brand_color = "1F77D9"  # Your brand blue
schemes = ["complementary", "analogous", "triadic"]

for scheme in schemes:
    params = {"base_color": brand_color, "scheme": scheme}
    response = requests.get(url, params=params, headers=headers)
    palette = response.json()

    print(f"\n{scheme.upper()} Scheme:")
    for color in palette["colors"]:
        wcag_level = "✓ AA" if palette["contrast"]["wcag_aa"] else "✗ AA"
        print(f"  {color['hex']} - {color['name']} ({wcag_level})")

JavaScript / Node.js Example

const axios = require("axios");

const generatePalette = async (baseColor, scheme) => {
  const response = await axios.get(
    "https://color-palette-api.p.rapidapi.com/generate",
    {
      params: { base_color: baseColor, scheme },
      headers: {
        "X-RapidAPI-Key": process.env.RAPIDAPI_KEY,
        "X-RapidAPI-Host": "color-palette-api.p.rapidapi.com"
      }
    }
  );

  return response.data.colors.map(c => ({
    hex: c.hex,
    name: c.name,
    wcag_compliant: response.data.contrast.wcag_aa
  }));
};

// Create dynamic theme
const theme = {
  primary: "#1F77D9",
  palette: await generatePalette("1F77D9", "triadic")
};

// Apply to CSS variables
const style = `
  :root {
    ${theme.palette.map((c, i) => `--color-${i}: ${c.hex};`).join('\n')}
  }
`;

Color Schemes Explained

Scheme	Description	Use Case
Monochromatic	Shades, tints, tones of one color	Minimalist, professional designs
Analogous	Colors next to each other on color wheel	Harmonious, calming designs
Complementary	Opposite colors on wheel	High contrast, eye-catching
Triadic	3 colors evenly spaced	Vibrant, balanced
Tetradic	4 colors (2 complementary pairs)	Complex, balanced designs

WCAG Contrast Standards

• WCAG AA – Minimum for web accessibility (4.5:1 for text)
• WCAG AAA – Enhanced (7:1 for text)
• Luminance Ratio – How different two colors are (1:1 = same, 21:1 = max)

Real-World Use Cases

1. Accessible Web Design

Generate palettes that pass WCAG AA/AAA automatically.

palette = generate_palette("your_color", "triadic")
if palette["contrast"]["wcag_aaa"]:
    print("✓ Your palette is accessible!")
else:
    print("⚠️  Adjust colors for WCAG AAA compliance")

2. Brand Color Generation

Create consistent color schemes from your brand primary color.

primary_brand = "1F77D9"
palette = generate_palette(primary_brand, "analogous")
# Use for: buttons, links, accents, backgrounds

3. Data Visualization

Generate distinguishable colors for charts and graphs.

# Create 10-color palette for data points
colors = generate_palette("FF6B6B", "tetradic")
chart_colors = [c["hex"] for c in colors]

4. Dynamic UI Themes

Generate user-customizable themes based on preference color.

user_favorite_color = request.form["color"]
theme = generate_palette(user_favorite_color, "triadic")
# Save and apply to user's dashboard

5. Accessibility Auditing

Check if existing color combinations meet WCAG standards.

result = check_contrast("FFFFFF", "CCCCCC")
if not result["wcag_aa"]:
    print(f"Contrast ratio {result['ratio']} is below AA requirement of 4.5:1")

Pricing

Plan	Cost	Requests/Month	Best For
Free	$0	500	Design prototypes, testing
Pro	$5.99	50,000	Design teams, agencies
Ultra	$14.99	500,000	Enterprise design systems

Related APIs

• Image API – Apply color palettes to images
• Markdown to HTML API – Style Markdown with generated colors
• Random Data API – Generate colors with other test data
• CSS Minifier API – Optimize CSS with color values

Get Started Now

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What's your favorite color combination? Share your palette in the comments!