Apple said on Tuesday that its customers spent $1 billion on purchases in its applications store in December, leading to a total of $10 billion worth of apps sold in 2013.
Apple reported app downloads of almost 3 billion apps in December, making it a record month for its App Store, which offers 1 million apps for its iPhone, iPad, and iPod Touch devices.
It competes with devices based on Google's Android system and phones and tablets based on Microsoft software.
(Read more: More than 1 billion of these devices to ship in 2014)
Drinktracker app for iPhone.Source: Drinktracker