This document provides a summary of key findings from the U.S. Mobile App Report. It finds that total digital media time spent in the U.S. has increased 24% in the past year, driven by a 52% increase in mobile app usage. Mobile app usage now accounts for 52% of total digital media time spent, surpassing desktop usage. It also finds that the top mobile app categories like social networking, games, and radio account for nearly half of total mobile app time spent. Finally, it reports that the rankings of top apps are dominated by large digital brands like Facebook, Google, Apple, and Amazon.