As a colorblind myself, I can think of at least one situation where this app might be very useful. My young daughter asks me all the time what color the objects she is interacting with are. About half the time I don't know the answer. Maybe with this app and some practice I can save myself the embarrassment.

By the way, in the sample tests shown on the article, while the app allows me to easily distinguish the number in the first picture, I can barely make out the number in the second picture even after it is enhanced by the app. So maybe the app could use some improvement or the settings needed for me could be different from the default ones.