Apple historically isn’t as open about the usage breakdown of their mobile OS versions as Google is, so a peek behind the curtain is exciting. Razorian Fly recently came across a page on Apple’s developer site promoting iOS 6 optimization that included this pie chart (below) of the versions currently in use. The chart shows an overwhelming majority of users running iOS 6.
This official chart closely mirrors the unofficial breakdown David Smith recently presented after looking at usage of his Audiobooks app. With such a vast majority of users faithfully updating, developers can safely focus their dev and testing efforts on iOS 5 and above. With the addition of iOS 7 it will be interesting to see if there are still iOS 5 holdouts or if the entire chart shifts up a version.