How apps are evolving: from Facebook and Spotify to taxis and shopping

Analytics firm App Annie outlines the big trends in the Android and iOS world, as Apple and Google continue to do battle

Apple started 2016 with the boast that its App Store customers had spent more than $1.1bn on apps and in-app purchases over the Christmas period, including $144m on New Year's Day alone.

But there is more to the apps world than just Apple. Analytics firm App Annie spends its time crunching data from Apple and Google's respective app stores, and its new 2015 Retrospective report sheds light on some key trends.