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Color Blindness Simulator

Approximate protanopia, deuteranopia, tritanopia and achromatopsia simulations.

Simulations model complete dichromacy using Machado et al. (2009); real perception varies between people.

About the Color Blindness Simulator

Preview how a palette or an image may appear to people with common color vision deficiencies. Simulations use the Machado et al. (2009) model in linear RGB and are approximations of average experience.

How to use it

  1. Enter palette colors or upload an image.
  2. Compare the original with each simulation.
  3. Look for colors that become hard to tell apart.
  4. Add labels, patterns or lightness contrast where needed.

Examples

  • Check that red and green status colors remain distinguishable.
  • Test a chart palette before publishing.

Frequently asked questions

How accurate are the simulations?
They model full dichromacy (or full achromatopsia). Real perception varies between people and many have milder anomalous trichromacy.
Is the image uploaded?
No, the image is processed in your browser.
What should I do if colors become indistinguishable?
Do not rely on color alone: add text labels, icons, patterns or increase lightness difference.

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Contrast CheckerAccurate WCAG contrast ratio with AA/AAA results and accessible suggestions.Palette Accessibility AnalyzerEvaluate readability and contrast across every combination in a palette.Image Color Analyzer & ExtractorExtract dominant colors, usage percentages, exact pixel colors and full color analysis from any image — privately in your browser.