“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

4.6 out of 5
13 Ratings
13 Ratings

Wonderful! A Picture Is Worth A Thousand Words

If your color blind and want others to see what you see, this is the app you want to use! Ever since I was a child, I’ve always suspected I was color blind. No one believed me because I can successfully guess the colors about 90% of the time. This wasn’t confirmed until I was 21.

Now that I have this app, I’ve used it with my wife, kids, friends and co-workers. Just recently, after taking an Ishihara Color Dot Test, I used this app to show the tester how I see the dots. Absolutely wonderful app!


Brilliant -- a wonderful tool for color deficiency

I'm color deficient and this tool can show others how I see.

It's truly incredible to have a real-time image from my iPhone camera.



This helps me shop for my color-blind son, so I can pick out clothes, books, and toys that he'll like. I've painted his room, decorated birthday cakes, and even shown his teachers what he sees. It's incredible, thank you!


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

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

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