Free colorblind test

How well can you
see color?

Tell us what you see in the following images and share the test results with your friends!

Get started

Did you know ...
why Facebook is blue?

Because Mark Zuckerberg is red-green color blind. Blue is the richest color people with this type of color blindness can see, which is why it is Facebook's dominant color.

Continue to next image

Did you know ...
who discovered color blindness?

John Dalton was the first to investigate color blindness and was color blind himself.
His diagnosis was confirmed in 1995, some 150 years after his death, by DNA analysis of his preserved eyeball, which he had donated to science.

Continue to next image

Did you know that ...
people don't see colors at night?

Most people usually find it difficult to recognize colors at night in dim moonlight. However, geckos and frogs, for example, can see colors only when it's dark.

Continue to next image

Did you know that ...
the army needs the color blind?

The American army used to recruit color blind men, because they could see through camouflage better than people with normal sight.

Continue to next image