Color Blindness Simulator
See a photo, chart or design the way people with a colour vision deficiency see it. Choose a type, set the severity and compare it with the original.
Your image stays on your device.
What each setting shows
- Protan: reduced sensitivity to red light. Reds look darker and merge with greens and browns.
- Deutan: reduced sensitivity to green light, the most common type. Reds, greens, oranges and browns look alike.
- Tritan: reduced sensitivity to blue light. Blues merge with greens, and yellows with pinks.
- No colour: complete colour blindness (achromatopsia), which is very rare.
Using it to check your designs
About 1 in 12 men and 1 in 200 women have a red-green deficiency. If two colours in your chart, map or interface look the same in the protan and deutan views, add a second cue such as a label, a pattern or a difference in brightness.
The simulation uses the model published by Machado, Oliveira and Fernandes in 2009. It is an approximation: real colour vision deficiency varies from person to person.
Questions about the simulator
Is my image uploaded?
No. The image is processed in your browser and is never sent to a server.
How accurate is the simulation?
It is a widely used scientific model for red-green and blue-yellow deficiencies. It shows which colours become hard to tell apart, but it cannot show exactly what another person experiences.
Sources
- Machado GM, Oliveira MM, Fernandes LAF. A physiologically-based model for simulation of color vision deficiency. IEEE Transactions on Visualization and Computer Graphics. 2009;15(6):1291-1298. doi.org
- National Eye Institute. Color Blindness. nei.nih.gov
Want to know your type and severity? Take the 20-plate test.
Start the color blind test