Even though Android is the most popular operating system for smartphones, it's still not as popular as Apple for new applications - and Android is getting less popular. According to Flurry, last year there were 3 Apple apps developed for every 2 Android Apps and this year it's fallen to a 3:1 ratio in Apple's favour.

This is possibly because it's easier to create revenue from Apple apps and on average apps are quicker to develop for iOS.