Nothing more, and nothing less. An app should take care of your primary task, and then get out of the way -- keep it simple. It all started out as a hobby trying to learn more about mobile app development through iOS and the Objective-C programming language in my spare time. With a the single goal of creating few easy to use, (sometimes stupidly) fun with clean interfaces.
My focus is primarily on the Apple echo system; iOS, tvOS, watchOS, with the occasional macOS app thrown in.