Of the many things that developers need to worry about when attempting to create a successful app, two points rise to the top. First, the app can't crash, and second, it has to respond to user input quickly. This is easier said than done, however, thanks to a deck that's stacked against developers. Crittercism spent a month collecting over 1 billion data points and determined which devices, operating systems, and networks best lead to stable - and profitable - apps.
MapQuest's recent entree into mobile developer tools is an interesting one. Choosing Android over iPhone means going toe to toe with Google, a familiar competitor to MapQuest on the mapping front. Mapping is logically MapQuest's turf. The company was helping people find directions online before Larry and Sergey were even in graduate school, let alone leaving to found Google. Of course, another way of looking at it is that Android is in line with MapQuest's latest push to open up mapping data.
Late 2017, the Apple developer community was set ablaze by a rumored Project Marzipan that would converge macOS and iOS. While the developer community did what it could to uncover the plans, it appears any plans addressing cross-platform development have more to do with declarative APIs.