• Are you color blind?

• Know somebody who is color blind?

• Think somebody is color blind?

Contrary to the name color blind, most color blind people are not blind to color. A more accurate description is color deficient. We see color. You just don't see it the same as we do. (Perhaps it is really you who are color deficient and we are normal.)

About 1 in 20 males are color blind. About 1 in 200 women are color blind.

The color blind gene is carried by the daughter to her son. For example, my mothers father was color blind. My daughter's may have a son who is color blind. Not every sibling is color blind as example by none of my brothers are color blind.

These series of images in this app are designed to provide a test which gives a quick assessment of color vision deficiency of congenital origin. This is the most common form of color vision disturbances. They are referred to as the Ishihara for Dr. Shinobu Ishihara (

What's New

Version 3.0

Re-written into Swift for iOS 11 support.

Ratings and Reviews

Love the tracing feature

A Rare Colorblind Gal

Thanks so much for an app that includes "colorblind only" plates AND the ability to trace them! Bravo.

Best app for clinicians


This app includes many different plates: some to rule-out color blindness, some to rule-in color blindness, and some to diagnose which type of color blindness is present. Unlike other apps out there, this one gives a clinical explanation of why each type of patient would see a particular number. In some of the plates, depending upon the diagnosis of the patient, each person would see a different number, and this app explains why. BRAVO to the app developers on creating such a useful clinical app!

Great app, and free


The best part is the test at the end where color blind people can see the numbers and normal color cannot. Now they know it feels. The website also explains why the army does not prohibit colorblindness. Apparently we are better at see shapes versus shades even if it is green against green. Now I know why I was always so much better at seeing the enemy before they saw me.


Edward Danley
18.4 MB
Requires iOS 10.3 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© Cassiopeia Information Technologies, LLC


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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