“Chromatic Vision Simulator” is a color vision simulation tool which simulates the color vision of color vision deficiencies. This software is developed by Kazunori Asada (Ph.D. medical science and Ph.D. media design), based on the research in color science.

About 5% of men have difficulty distinguishing red and green, or recognizing dark red. Such color deficiency can be classified into three major categories: protanope / Protanomal, Deuteranope / Deuteranomal and Tritanope / Tritanomal.

Color deficiencies are the inability to tell differences between some colors other people can easily distinguish. People with different types of color vision deficiency perceive colors differently. For example, individuals diagnosed as Protan or Deutan cannot perceive differences between red and green, and pink and cyan.

These color visions are predictable by calculating working of the cone cells that perceives the color to some degree.

"Chromatic Vision Simulator" makes simulated images of each color vision type from built-in Camera or Photos and shows you how people with specific types of color vision sees the world in real-time.

What's New

Version 2.31

Fixed a bug that crashes immediately after displaying splash when used with iOS 9 or lower.

Ratings and Reviews


Really useful app

This app is so helpful. I'm a teacher and it makes it really easy to check if my resources are fully accessible to colour-blind students. I recommend this to everyone, and I'm yet to find someone who isn't fascinated by it! I wish it was available on other devices so I could use it with the larger screen of my Windows tablet.



My father is colour blind, and the entire family found this app very interesting. He confirmed that the "D" type was really close to his perception.

Quite entertaining fur us all, and suddenly very obvious add to why blue is his favourite colour!


Best app I couldn't find for colour blindness testing

Great for helping those who do not understand colour blindness to experience it.


Kazunori Asada
26.4 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad and iPod touch.
English, Japanese, Korean, Simplified Chinese, Traditional Chinese
Age Rating
Rated 4+
© 2017 Kazunori Asada


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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