Today, Apple has announced that App Store sales topped $10 billion in 2013. In December alone, customers spent over $1 billion in the store, a record-breaking figure — the most successful month in App Store history. In total, developers for iOS and OS X have now earned $15 billion on the App Store.

Cue called the app lineup for 2013 ‘astonishing’. In the report, Apple calls out a handful of apps in particular for their success, including Heads Up, Candy Crush, and QuizUp.

Apple is set to report its financial earnings for the holiday quarter (such as iPhone and iPad device sales) on January 27th.