Color Blindness Simulator

Visualize how your colors appear to people with different types of color vision deficiency

Select Color

#3b6473

≈ #3B6473

Key Takeaway: What is Color Blindness Simulation?

A Color Blindness Simulator models how colors appear under various Color Vision Deficiencies (CVD) including Protanopia (red-blind), Deuteranopia (green-blind), Tritanopia (blue-blind), and Achromatopsia (monochromacy). Designing accessible interfaces according to WCAG 2.1 Guideline 1.4.1 ensures key UI signals do not rely solely on hue perception.

WCAG 2.1 Rule: 1.4.1 Use of ColorRelated Tools:Color Contrast Checker · Browse Colors

Blindness Simulator

Check how a color is perceived by people with different types of color blindness to create more accessible designs. Understanding color perception helps ensure your content is accessible to everyone.

Impact

8% of men and 0.5% of women have some form of color vision deficiency.

Types

Red-green blindness is most common, affecting how reds and greens are perceived.

Design Better

Use contrast and patterns alongside color to convey essential information.

Original Color

This is how the color appears with normal color vision.
#3b6473#3B6473

Red-Green Blindness (Protanopia)

Protanopia

✓ 93% SIMILAR
1.3% of men, 0.02% of women
How it appears#585878

Protanomaly

✓ 97% SIMILAR
1.3% of men, 0.02% of women
Original
#3b6473
Simulated
#455971

Red-Green Partial (Deuteranopia)

Deuteranopia

✓ 93% SIMILAR
1.2% of men, 0.01% of women
How it appears#4d4a6f

Deuteranomaly

✓ 97% SIMILAR
5% of men, 0.35% of women
Original
#3b6473
Simulated
#465c71

Blue-Yellow Blindness (Tritanopia)

Tritanopia

✓ 97% SIMILAR
0.001% of men, 0.03% of women
How it appears#3e6d6c

Tritanomaly

✓ 99% SIMILAR
0.001% of the population
Original
#3b6473
Simulated
#3d6970

Monochromacy (Total Color Blindness)

Achromatopsia

✓ Grayscale
0.003% of population (Complete absence of color)
How it appears#545454

Achromatomaly

✓ 90% SIMILAR
Rare severe partial color perception loss
Original
#3b6473
Simulated
#4b5558

Understanding Color Vision Deficiencies & Accessibility

Approximately 1 in 12 men (8%) and 1 in 200 women (0.5%) worldwide experience color vision deficiency. Testing your web interface and graphic elements ensures all users can navigate your product effectively.

Color Vision Deficiency Breakdown

Deficiency TypeAffected Cone CellsPerception ImpactPrevalence
Protanopia / ProtanomalyL-cones (Long wavelength / Red)Red light appears darker; red and green shades blend together.~1.3% of men
Deuteranopia / DeuteranomalyM-cones (Medium wavelength / Green)Green light perception is reduced; difficulty distinguishing red, green, and yellow.~5.0% of men
Tritanopia / TritanomalyS-cones (Short wavelength / Blue)Blue light perception is reduced; blue and green or yellow and violet blend.~0.03% of population
AchromatopsiaAll cone photoreceptorsTotal absence of color perception; vision is strictly in shades of gray.~0.003% of population

Frequently Asked Questions (FAQ)

Direct Answer: Color vision testing ensures compliance with WCAG 2.1 Guideline 1.4.1 (Use of Color). If error states, form validations, or key CTA buttons rely solely on color cues (such as red vs. green indicators), color-blind users will miss vital information.

Direct Answer: The simulator applies standard LMS matrix transformations (Vienot, Brettel, and Machado algorithms) to convert RGB values into LMS cone responses, projects the deficiency plane, and converts back into sRGB coordinates.
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