The document analyzes mobile app engagement trends in 2014 based on data from Localytics. It finds that overall time spent in apps increased 21% from 2013 driven by more frequent app launches. Time in app was higher for large screen devices and tablet apps. Music and health apps saw the largest increases in time spent. While smartphone apps had more launches, tablet app sessions were longer. The document also found that users acquired through ads and organically performed similarly once in the app.