Color Blindness Simulator
See your image as ~8% of people do.
Runs entirely in your browser — nothing you enter is uploaded, logged, or tracked.
Roughly 1 in 12 men and 1 in 200 women see color differently. Drop in a design, chart or photo to view it through protanopia, deuteranopia, tritanopia and full color blindness — side by side with the original — so you can catch unreadable color combinations before you ship. The image never leaves your device.
Frequently asked questions
How accurate is the simulation?
It applies the widely used color-vision-deficiency matrices to each pixel — a close, well-established approximation that is great for catching problems, though no simulation fully replaces testing with real users.
Which types can it simulate?
Protanopia (red-weak), deuteranopia (green-weak), tritanopia (blue-weak) and achromatopsia (total color blindness).
Is my image uploaded?
No. Every pixel is transformed in your browser with the Canvas API; the image is never sent anywhere.