Sinple Supporter is a dummy app to demonstrate how iOS Alternate Icons work. This feature was introduced in iOS 10.3 beta1. You can see it in action:
You should notice that You have changed the icon for "Sinple Fan" is a system alert that you cannot avoid. Its purpose is to prevent us from changing the icon without the user knows it.
Everything about this feature is explained in this medium post: iOS 10.3 Alternate Icons: what can you do and how it works ?.
To run the demo: simply clone this repo and open SinpleSupporter.xcodeproj with Xcode 8.3 (and above).