Apple’s App Store, Google Play, the Windows Phone Store and BlackBerry World hit 13.4 billion downloads…

These data provide by Canalys’ App Interrogator research, covering the leading app stores in more than 50 countries, shows us a healthy growth in the download and purchase of apps on mobile devices.

Therefore we learned that App downloads across the four stores: Apple’s App Store, Google Play, the Windows Phone Store and BlackBerry World seem to have climbed 11% in Q1 2013 worldwide over the Q4 2012 total, while direct revenue from paid-for apps, in-app purchases and subscriptions combined grew by a slightly more modest

9%. Combined, downloads from the stores totaled more than 13.4 billion, and revenue seem to have reached $2.2 billion (before revenue sharing is taken into account).

Canalys’ App Interrogator research notes also that 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.

However 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. Worldwide, Apple’s App Store accounted for the largest indexed proportion of revenue between the four stores, at around 74%, while the Google Play store saw the greatest number of downloads, accounting for about 51% of the stores’ collective total, with Apple close behind.