The newly announced Nokia X series may be Android-based devices but that doesn’t mean they’ll be able to run all apps out of box. According to the Finnish company, around 75% of existing Android apps will work without a problem, while 25% will require certain tweaks.
As far as I can tell, the problem occurs with apps that require access to Google’s APIs which don’t come preloaded with any of the Nokia X smartphones. Those apps will have to be tweaked to sing along Nokia’s or Microsoft’s services, (for instance) relying on HERE maps rather than Google Maps.
To make it easier for developers, Nokia launch an app compatibility analyzer which will let app makers know whether any modification is needed before publishing their Android app to Nokia Store.
There’s a whole section at Nokia Developers website dedicated to Nokia X smartphones; you can check it out from here.