Some form of color blindness affects a large portion of the population, and here’s a library called Vangogh from Gil Shapira that makes it easy to test an app for people with different levels of color blindness.
Vangogh applies a filter onto your app, and this allows you to simulate color vision deficiencies. A nice interface is provided for easily switching between filters within a running app.
This animation from the readme shows the Vangogh library in action:
You can find Vangogh on Github here.
A nice app for checking to see whether the colors in an app may be causing trouble for those who have difficulty viewing colors.
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