App downloads from four of the major app marketplaces – Apple’s App Store, Google Play, the Windows Phone Store and BlackBerry World – were up 11% in Q1 2013 as compared to all of Q4 2012, according to market research firm Canalys’ latest App Interrogator research.

The report also revealed these four stores combined had 13.4 billion downloads, and $2.2 billion in revenue. In addition, revenues from paid-for apps, in-app purchases and subscriptions combined grew 9% in Q 2013, over the whole year 2012.

Here is more about how sales broke down globally from the press release:

Some of the strongest growth was seen in emerging markets, such as South Africa, Brazil and Indonesia, helped not least by the growing base of smart device users in those countries. But robust growth, both in revenue terms and download volumes, was seen in mature mobility markets, such as North America, up 8% and 6% respectively, and Western Europe, up 8% and 10% in Q1.