I should have mentioned that this App is basically for an App developer and designer.
So that they can check the UI color combination using this app.
This App "can not" change any other apps color.
you can set the UIColor for navigation bar, background and text color.
It is such a small function but it is quite useful because this App will help you to find the best color combination.
I am very happy if you use this App to find a suitable color combination for your App designing.