87% of all active iOS devices are running the latest version of this operating system
Apple has published statistics proliferation of different versions of iOS. So, on 28 July this year, 87% of all active devices of the corresponding segment was running the latest iOS 10.
Another 10% worked in iOS 9 and earlier versions account for only 3%. For comparison, the share of Android Nougat is now only 11.5%. However, it was and will always be, as iOS uses only one company, and Android hundreds.