Developers often ask me about the versions of operating systems that are used to access the site so I keep an occasional eye on the analytics.

Looking at iOS I notice that version 9 is now appearing at just over 6% of the visitors. Version 8 accounts for around 92% with an occasional visitor still using versions 5-7. Just in case the site visitors are not representative I thought I'd check on the Mixpanel site, they also show >90% using iOS 8 as shown below.

The lack of fragmentation in iOS adoption makes it easy for developers to decide on which version of the operating system they need to support.