Chris Dixon has broken down mobile apps into four different categories. First you’ve got the time wasters, the applications you use when you have a few minutes to spare, then the core utilities, those are the applications that are always on your home screen, (i.e. the clock, camera, texting, contacts) next are the episodic utilities, the applications that may not consistently be on your home screen but they are generally very useful, for example, Uber, or OpenTable, and then finally are the notification driven apps. [Source: Chris Dixon]