Preview How Colorblind Users See Your Images

Color vision deficiency, commonly called color blindness, is a condition where certain cone cells in the retina do not function normally. This makes it harder to distinguish between specific colors. About 8% of men and 0.5% of women have some form of CVD.

Protanopia means the red cone cells are absent (red-blind), while deuteranopia means the green cone cells are absent (green-blind). Both are red-green color blindness, but protanopia also causes red colors to appear darker. Deuteranopia is the most common type.

Most people with color vision deficiency have anomalous trichromacy — their cone cells work, but with shifted sensitivity. The severity slider lets you simulate the full spectrum from mild anomaly (e.g., deuteranomaly) to complete dichromacy (e.g., deuteranopia).

Daltonize is a technique that takes the color information lost in a particular type of color blindness and shifts it into color channels that the person can still see. It helps colorblind viewers distinguish colors they would otherwise confuse.

About 1 in 12 men has some form of color vision deficiency. If your website, app, or infographic relies on color alone to convey information, a significant portion of your audience may miss important details. Testing with a simulator helps you create more accessible designs.

The simulation uses scientifically derived color transformation matrices based on the Brettel, Vienot, and Machado models. While no simulation can perfectly replicate another person's visual experience, these models are widely accepted in accessibility research.