Freemium Apps are Exploding, Japan and China among growth leaders

Freemium apps - free apps that have in-app purchases - are experiencing impressive revenue growth worldwide, far outpacing premium apps in both iOS and Google Play stores. Over the last 24 months, worldwide revenues for freemium apps on iOS have more than quadrupled. In 2012, worldwide freemium revenues on Google Play have grown 3.5X. Premium revenues for both app stores remained relatively flat in these time periods.
Through App Annie Intelligence, we're able to analyze app store data to see some numbers behind the growth in freemium revenues:

http://www.appannie.com/blog/freemium-apps-ios-google-play-japan-china-leaders/#.UJl6ScXMhsl