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Color Blindness Simulator

Simulate how your images or colors appear to people with different types of color blindness. Test for Protanopia, Deuteranopia, Tritanopia and more. Free, browser-based.

Test color:
Normal Vision
Standard color perception. No color vision deficiency.
Prevalence: Most people

Color Blindness Simulator — How It Works

This free tool applies scientifically-calibrated Dalton transformation matrices to your uploaded image, showing exactly how it appears to people with different types of color vision deficiency. All processing runs in your browser — your image never leaves your device.

Types of Color Blindness Simulated

Protanopia — Red-blind. Affects ~1% of males. Reds appear dark/black.
Deuteranopia — Green-blind. Most common (1% males). Greens look red-brown.
Deuteranomaly — Green-weak. Most prevalent (5% males). Subtle red-green confusion.
Tritanopia — Blue-blind. Rare (<0.01%). Blues appear green, yellows appear pink.
Achromatopsia — Total color blindness. 1 in 33,000 people. All shades of gray.
Protanomaly — Red-weak. Reduced red sensitivity. A milder form of protanopia.

Frequently Asked Questions

About 8% of men and 0.5% of women worldwide have some form of color vision deficiency — approximately 300 million people globally. Deuteranomaly (green-weak) is the most common type, affecting about 5% of males.

No. Image processing runs entirely in your browser using the HTML5 Canvas API and JavaScript matrix math. Your image never leaves your device and is never sent to any server.

Upload your UI screenshot, infographic, or chart and cycle through each color blindness type. Look for elements that become invisible or indistinguishable. Fix issues by adding text labels, patterns, or using a color-blind-safe palette (e.g., blue-orange instead of red-green).

WCAG 2.1 Success Criterion 1.4.1 (Use of Color) requires that color is not the only visual means of conveying information. WCAG 2.1 SC 1.4.3 requires a minimum 4.5:1 contrast ratio for normal text. This tool helps identify violations.

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