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Colorblind Friendly Palette Checker - Online Simulate & Advise

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🎨 Colorblind Friendly Palette Checker

Simulate how your color palette appears to people with different types of color vision deficiency (CVD). Get instant feedback and improve accessibility.

Accessibility Advice
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Simulated Colors Comparison
Add at least two colors to see comparisons.

Why Colorblind‑Friendly Design Matters

Color vision deficiency (CVD) affects approximately 1 in 12 men and 1 in 200 women. It changes how people perceive colors, making it difficult to distinguish certain hues. The most common types are red‑green (protan/deuteran) and blue‑yellow (tritan) deficiencies.

  • Use high contrast in lightness, not just hue.
  • Avoid red‑green combinations; prefer blue‑orange or blue‑yellow.
  • Test your palette with simulators like this tool.
  • Add patterns or labels for important information.
  • Use WCAG contrast ratios as a baseline.

Some universally safe palettes rely on lightness differences. Examples: Blue + Yellow, Black + White, or Blue + Orange. Always double‑check with a CVD simulator.

It uses scientifically validated matrices (Brettel, Viénot, Mollon) to approximate dichromatic vision. While not perfect (individual variation exists), it is a reliable guide for accessibility testing. For total color blindness (achromatopsia) we simulate full grayscale.
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