What types of color blindness does this simulator support?

The simulator supports 8 types: Protanopia (red-blind), Deuteranopia (green-blind), Tritanopia (blue-blind), Protanomaly (red-weak), Deuteranomaly (green-weak), Tritanomaly (blue-weak), Achromatopsia (total color blindness), and Achromatomaly (partial color blindness).

How accurate is the color blindness simulation?

The simulation uses the Vienot, Brettel & Mollon (1999) algorithm with established RGB-to-LMS conversion matrices — the industry standard for color blindness simulation. While no simulation perfectly replicates individual experiences, these algorithms provide a scientifically validated approximation used in professional accessibility tools.

Is my color data sent to any server?

No. All color calculations are performed entirely in your browser using JavaScript math. Your colors never leave your device — this tool is 100% client-side.

What is the most common type of color blindness?

Deuteranomaly (green-weak) is the most common form, affecting about 5% of males. Protanomaly and Deuteranopia each affect about 1% of males. Overall, approximately 8% of males and 0.5% of females have some form of color vision deficiency.

What WCAG contrast ratio should I aim for?

WCAG 2.1 requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text at Level AA. For enhanced Level AAA, aim for 7:1 for normal text and 4.5:1 for large text. Use the Contrast Checker tab to verify your ratios across different CVD types.

How can I make my designs more accessible for color blind users?

Key strategies: (1) Don't rely solely on color to convey information — add patterns, icons, or labels. (2) Ensure sufficient contrast between background and foreground colors. (3) Avoid red-green color combinations, which are problematic for the most common CVD types. (4) Test your entire color palette with this simulator before publishing.

Accessibility Tool

See Colors Through
Different Eyes

Simulate how people with color blindness see your designs. Test any color palette against 8 types of color vision deficiency instantly — no uploads, 100% private.

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8 CVD Types

Simulate Protanopia, Deuteranopia, Tritanopia, Achromatopsia, and 4 anomalous trichromacy variants.

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Palette Testing

Test entire color palettes at once. See how your brand colors and UI elements appear to users with CVD.

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100% Private

All simulations run in your browser using pure math. No colors are ever sent to any server.

Color Palette

Click a swatch to edit · up to 8 colors

Simulation Results

Click any swatch to copy its hex value · M = predominantly affects males

Normal Vision

Typical trichromatic vision~92%

Protanopia

Red-blind · L-cone absent~1% M

Deuteranopia

Green-blind · M-cone absent~1% M

Tritanopia

Blue-blind · S-cone absent<0.1%

Protanomaly

Red-weak · L-cone shifted~1% M

DeuteranomalyMost Common

Green-weak · M-cone shifted~5% M

Tritanomaly

Blue-weak · S-cone shifted0.01%

Achromatopsia

Total color blindness0.003%

Achromatomaly

Partial color blindnessVery rare

Frequently Asked Questions

Everything you need to know about Color Blindness Simulator.

See Colors ThroughDifferent Eyes