PseudoChromatic ColorTest 4+

Cassiopeia Information Technologies

Designed for iPad

    • 3.5 • 6 Ratings
    • Free



• 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

This app has been updated by Apple to display the Apple Watch app icon.

Re-written into Swift for iOS 11 support.

Ratings and Reviews

3.5 out of 5
6 Ratings

6 Ratings

Muck.Raker ,

Helpful, but needs better instructions

Need to put your iPad in vertical mode to use this. Otherwise the images are squished and text that is displayed after each image is not visibl.

Needs instructions to explain how to use it, or a better user interface to make it clear.

But once you figure it out, it seems to be good.

Steve White MD ,

Free and reasonable

Nice simple app for color vision. I will use this when I see patients taking medication that might cause problems.

One small nit: the arrow keys to navigate are not in keeping with user guidelines, I think, and should be dropped. Instead let us swipe to the next plate, or back.

Otherwise, again, nice app.

A Rare Colorblind Gal ,

Love the tracing feature

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

App Privacy

The developer, Cassiopeia Information Technologies, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.

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