Approximately 8% of men and 0.5% of women have some form of color vision deficiency (color blindness). Designing with accessibility in mind means ensuring your color choices work for everyone. This tool simulates how colors appear under different types of color blindness (protanopia, deuteranopia, tritanopia, and others) so you can verify your design is accessible.
Normal Vision
#e74c3c
Protanopia
Red-blind: no red cone cells
~1% of males
#786d39
Deuteranopia
Green-blind: no green cone cells
~1% of males
#9f8f36
Tritanopia
Blue-blind: no blue cone cells
~0.003% of population
#fe1b49
Protanomaly
Red-weak: reduced red cone sensitivity
~1% of males
#ab6838
Deuteranomaly
Green-weak: reduced green cone sensitivity
~5% of males
#b77d37
Tritanomaly
Blue-weak: reduced blue cone sensitivity
~0.01% of population
#e94943
Achromatopsia
Total color blindness: sees only grayscale
~0.003% of population
#828282
Enter a HEX color code or use the color picker to select a color. The tool instantly shows how that color appears under 7 types of color vision deficiency: Protanopia, Deuteranopia, Tritanopia, Protanomaly, Deuteranomaly, Tritanomaly, and Achromatopsia. Each simulation is displayed side-by-side with the original color for easy comparison, along with a description of the condition and its prevalence.
Color blindness simulation is critical for accessible design - ensuring UI elements, charts, maps, and infographics remain distinguishable for all users. It is used by designers testing button and link colors, data visualization developers selecting chart color palettes, game designers creating colorblind-friendly modes, educators designing accessible learning materials, and quality assurance teams auditing WCAG compliance for web accessibility.
Color blindness simulation uses color transformation matrices based on the Brettel, Viénot, and Mollon (1997) algorithm for dichromatic vision (missing cone type) and the Machado, Oliveira, and Fernandes (2009) algorithm for anomalous trichromacy (weakened cone type). The RGB color is converted to LMS (Long, Medium, Short wavelength cone response) color space, the appropriate cone response is modified or removed, and the result is converted back to RGB. These scientifically validated models accurately replicate how colors appear to people with each condition.
Color blindness (color vision deficiency) is the reduced ability to distinguish between certain colors. The most common types affect red-green perception. About 1 in 12 men and 1 in 200 women have some form of color blindness.
The main types are: Protanopia (no red cones), Deuteranopia (no green cones), Tritanopia (no blue cones), Protanomaly (weak red), Deuteranomaly (weak green - most common), Tritanomaly (weak blue), and Achromatopsia (complete color blindness).
Don't rely solely on color to convey information - use labels, patterns, or icons as well. Ensure sufficient contrast between foreground and background colors. Test your palette with this simulator and a WCAG contrast checker.
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