See how colors appear with different types of color vision deficiency
Test your color palette or images for accessibility. Simulates protanopia (red-blind), deuteranopia (green-blind), tritanopia (blue-blind), and achromatopsia (total color blindness). About 8% of men and 0.5% of women have some form of color vision deficiency. Essential for accessible design.
Approximately 8% of men and 0.5% of women worldwide have some form of color vision deficiency (CVD). The most common types are protanopia (red-blind, ~1% of men), deuteranopia (green-blind, ~1%), and protanomaly/deuteranomaly (reduced red/green sensitivity, ~6% combined). Tritanopia (blue-blind) is much rarer (<0.01%). Designing with color blindness in mind is both an accessibility requirement (WCAG guidelines) and good UX practice — it ensures your charts, maps, traffic signals, and UI elements are usable by everyone. This simulator shows how your chosen colors appear under different types of CVD, helping you identify problematic color combinations and find accessible alternatives. Never rely on color alone to convey information.
About 300 million people worldwide. It affects ~8% of men and ~0.5% of women due to the X-linked genetic inheritance pattern. Red-green deficiency is most common, blue-yellow is rare.
Red/green is the most problematic pair. Also avoid: red/brown, green/brown, blue/purple, and light green/yellow. Use high contrast, patterns, labels, or icons alongside color to ensure accessibility.
Don't rely solely on color to convey meaning. Add patterns to chart bars, use labels on maps, ensure sufficient contrast (WCAG AA: 4.5:1), and test with simulators like this one. Tools like our Color Contrast Checker help verify ratios.
Currently, no cure exists, though gene therapy research shows promise. Color-correcting glasses (like EnChroma) can enhance color distinction for some types of CVD but don't restore normal color vision.
No — complete color blindness (achromatopsia) is extremely rare (<0.003%). Most color-blind people see colors, just with reduced ability to distinguish certain pairs. They typically see millions of colors, just a different set than normal vision.