Mobile app usage grew 76% in 2014, according to a recent report from Flurry Analytics.

Usage was defined by the researchers as a "session," in which a user opened a mobile application and used it. The report was based on data from more than 2 trillion global sessions that occurred in 2014.

Sessions for every app category increased in 2014, though the big overall year-over-year jump in usage was due mainly to triple-digit growth in three categories: lifestyle/shopping, utilities/productivity, and messaging/social.

Sessions on shopping iOS and Android apps combined spiked 174% last year, the biggest percentage increase of any category. On Android alone, the number of sessions in the shopping category increased 220%.

The release of new Microsoft Office apps for iOS and Android in 2014 helped spur 121% more sessions in the utilities/productivity category compared with 2013 levels.

Messaging/social apps, which jumped 115% in sessions in 2013, also posted triple-digit growth in 2014, increasing 103%.