Apple has updated part of its developer website to highlight that the vast majority, 93%, of iOS customers are using iOS 6 or higher. iOS 5 is still in use by just 6% of customers, while 1% use iOS 4 or below. These statistics were measured using App Store visits from iOS devices over a two-week period. Apple CEO Tim Cook also talked about this during the keynote at WWDC 2013 last week.
The obvious message here is one of comparison to their leading competition, Android, where a much smaller group of users, just 33%, are running a version of Android released within the last year, with just 4% using the a version of the latest major release, Jelly Bean. Google's measurements of these numbers come from the same two-week period as Apple's.
Showing that 93% of iOS users are on some version of iOS 6 let's developers plan app roadmaps better. If they can count on such a large percentage of users being on the latest version of the operating system, then they can take advantage of the APIs that were not a part of the previous version. And as we head towards iOS 7, developers will need to decide if and when they're going to release app updates that require iOS 7, and these numbers might help them decide to do that sooner rather than later.