iOS 15 is installed on 72 percent of all iPhones introduced in the last four years. 26 percent of devices continue to use iOS 14, and two percent run an earlier version of iOS 15. When counting iPhones released more than four years ago, 63 percent of them run iOS 15, 30 percent run iOS 14, and seven percent run an earlier version of iOS 15.
Installation numbers are lower on the iPad. 57 percent of all iPads introduced in the last four years are running iOS 15, while 39 percent continue to run iOS 14. Four percent run an earlier version of iOS.
Counting all iPads, including those released more than four years ago, 49 percent of devices are running iPadOS 15, 37 percent are running iPadOS 14, and 14 percent are running an earlier version of iOS.
Apple splits its installation numbers into separate groups because there are still devices in the wild that are not capable of running iOS 15 or iPadOS 15, but even when counting only devices released in the last four years, the number of devices running iOS 15 falls lags behind prior operating system installation rates.
iOS 14, for example, was installed on 81 percent of iPhones released in the last four years in December 2020, marking a much higher update rate a month earlier. Even iOS 13, another update that saw slow installation, was installed on 77 percent of devices by the end of January 2020.
iOS 15 and iPadOS 15 had several features that did not arrive as expected when the operating systems launched, such as SharePlay, and Digital Legacy, and other features like iCloud Private Relay remain in beta. People were also put off by Apple’s anti-CSAM measures, which have been indefinitely delayed.
Key iOS and iPadOS 15 features like digital IDs in Wallet and Universal Control are still unavailable, but could spur people to update when launched in the future.