Color Blindness Simulator

Around 8% of men and 0.5% of women have some form of red-green color vision deficiency. Protanopia and deuteranopia are caused by missing red- or green-sensitive cones and make red and green hard to distinguish; the rarer tritanopia affects blue-sensitive cones, and achromatopsia removes color perception entirely.

Protanopia Protan

Missing L (red) cones, so red appears dark and shifts toward green.

Deuteranopia Deutan

Missing M (green) cones, the most common form; red and green merge.

Tritanopia Tritan

Missing S (blue) cones, so blue and yellow become hard to tell apart.

Achromatopsia Mono

No functioning cones, a complete absence of color vision.

This simulator applies research-based transformation matrices (Viénot 1999 and Machado 2009) in linear RGB to approximate each deficiency. It is a simulation, not a clinical measurement, but it is a reliable way to check that your interface never relies on color alone to communicate meaning.