Color Tools

Compare Colors & WCAG Contrast Checker Tool

A comprehensive color comparison engine for designers and developers. Evaluate contrast ratios between background and text, check WCAG 2.1 compliance levels, simulate color vision deficiencies, and generate accessible color tweaks instantly.

Background A / Text B

Sample Heading

The quick brown fox jumps over the lazy dog.

Background B / Text A

Sample Heading

The quick brown fox jumps over the lazy dog.

Contrast Ratio

6.83 : 1

✓ Legible for text

Normal Text (AA/AAA):AA Pass
Large Text (AA/AAA):AA Pass
Visual Difference (Delta E)241.46

Interactive UI Mockup Preview

App Navigation Header

This live preview renders how body copy, border lines, and interactive button components look when pairing Color A as background and Color B as foreground element.

Export Developer Code
:root {
  --color-a: #1E293B;
  --color-b: #38BDF8;
  --contrast-ratio: 6.83;
}

Why use this tool?

Why use this tool?

Choosing accessible color combinations is essential for modern web standards. This tool eliminates guesswork by providing mathematically precise contrast ratios, visual distance calculations, and real-time UI previews.

How to use it

How to use it

  1. Step 1

    Enter Color Codes

    Select or paste Hex/RGB codes into Color A and Color B input fields.
  2. Step 2

    Analyze Contrast & WCAG

    Review the calculated Contrast Ratio and WCAG AA/AAA compliance badges.
  3. Step 3

    Test Simulation & Export

    Check the colorblind preview tab and copy the resulting CSS variables for your project.

Side-by-Side Visual & Technical Comparison

Input any two color values using Hex, RGB, or HSL to analyze their technical relationship. The tool computes contrast metrics according to WCAG guidelines alongside perceptual distance using mathematical color science.

Color Vision Deficiency Simulation & UI Preview

Preview how your selected color pair looks to users with Protanopia, Deuteranopia, or Tritanopia. Live component previews show how your text and background pairings behave on buttons, alert cards, and typography.

Features explained

WCAG 2.1 Contrast Matrix

Calculates exact contrast ratios (1:1 to 21:1) and assigns official AA and AAA pass/fail badges for text legibility.

Delta E Perceptual Difference

Measures mathematical color distance to inform you if two shades appear distinctly different to the human eye.

Colorblind Vision Simulator

Simulates Protanopia, Deuteranopia, and Tritanopia color perception modes in real time.

Smart Accessibility Auto-Fixer

One-click adjustment that automatically shifts lightness levels to achieve WCAG AA compliance.

What can you use it for?

Web Accessibility Auditing

Ensure button text and background colors meet required WCAG guidelines before deployment.

Brand Palette Evaluation

Compare primary brand colors against secondary accent options for legibility and visual balance.

Tool information

Supported FormatsHex, RGB, HSL
Standard ComplianceWCAG 2.1 (AA & AAA)
Color Distance EngineCIE76 / Perceptual Delta E
Processing100% In-Browser Engine

Benefits

  • Instant feedback on WCAG compliance.
  • Colorblind preview modes for accessible UX design.
  • One-click CSS and Tailwind variable generation.

Limitations

  • Calculations are based on standard sRGB color space rendering.

Private Local Processing

All contrast math and color space transformations run locally inside your web browser without uploading data.

Privacy Policy

We do not log, track, or save your compared color values or preview configurations.

Tips

  • Aim for a contrast ratio of at least 4.5:1 for normal body text to meet WCAG AA standards.
  • Use the Swap button to quickly reverse foreground and background pairings.

Frequently asked questions

What is a good WCAG contrast ratio for body text?

A minimum ratio of 4.5:1 is required for normal text to pass WCAG AA standards. For AAA compliance, a ratio of 7:1 is required.

What does the Delta E value mean?

Delta E measures perceptual color difference. A Delta E under 1.0 is imperceptible to human eyes, while values above 5.0 indicate clearly distinct colors.

Is this comparison tool free to use?

Yes, it is completely free with no usage limits or sign-up required.

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