ToolVaults

Color Blindness Simulator — Preview Your Palette for CVD

Simulate how your colors look to people with color vision deficiency (CVD). Covers all 8 common types — deuteranomaly, protanopia, tritanopia, achromatopsia, and more.

Runs 100% in your browser — nothing is uploaded.

Quick presets
  • Normal vision
    Baseline
    #6366F1
  • Deuteranomaly (green-weak)
    ~5% of men
    #6465DD
  • Deuteranopia (green-blind)
    ~1% of men
    #6464C7
  • Protanomaly (red-weak)
    ~1% of men
    #6465E0
  • Protanopia (red-blind)
    ~1% of men
    #6464CF
  • Tritanomaly (blue-weak)
    <0.01%
    #638BD8
  • Tritanopia (blue-blind)
    <0.01%
    #63B5AF
  • Achromatomaly (partial monochrome)
    Very rare
    #6D6EAD
  • Achromatopsia (full monochrome)
    ~0.003%
    #757575

Frequently asked

How accurate is the simulation?

It uses the Machado, Oliveira & Fernandes (2009) physiologically-based transformation matrices — the same model used by tools like Sim Daltonism and the Chrome DevTools rendering emulator.

Which type is most common?

Deuteranomaly (green-weak) affects around 5% of men and about 0.4% of women. Full deuteranopia and protanopia together account for another ~2% of men.

Why should I test for this?

Roughly 1 in 12 men and 1 in 200 women have some form of CVD. If your UI relies on red vs. green (chart series, success/error states, form validation), it may be unusable for a meaningful chunk of your audience.

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