Color Blindness Simulator
Preview how a color appears to people with protanopia, deuteranopia, tritanopia or achromatopsia.
Quick answer: Preview how a color appears to people with protanopia, deuteranopia, tritanopia or achromatopsia.
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Frequently asked questions
- Is it free?
- Yes — free with no signup.
- Which types are simulated?
- Protanopia (red-blind), deuteranopia (green-blind), tritanopia (blue-blind) and achromatopsia (full color-blindness).
- Are the matrices accurate?
- Yes — they're the Brettel/Viénot/Mollon matrices used in academic research and accessibility tooling.
- Should I rely on color alone in my UI?
- No — always pair color with another cue like text, icon or shape so color-blind users aren't excluded.
- Is anything uploaded?
- No — every simulation runs in your browser.