Apple made the latest iOS and iPadOS distribution numbers public on its developer website. It should come as no surprise that only three weeks after its release, iOS 13 is already running on more than half (55 percent) of iPhones sold in the last four years. 38% are still using the previous version, iOS 12, and only 7% are running on an earlier version of the mobile operating system.
iPadOS is the first version of iOS rebranded (and adapted) to the iPad, as of version 13. It is already on 41% of slates sold in the past four years, while 51% are still running iOS 12.