iOS 26 Adoption Rate Lags iOS 18 by 3 Points in June Data

Apple's June figures put 79% of all compatible iPhones on iOS 26, below the 82% iOS 18 had reached at the same point last year, and the second-lowest June adoption rate Apple has recorded since 2015, ahead of only iOS 17, according to App Store data. The upgrade cycle is functioning. It's just running softer than Apple's own recent standard. That gap has been visible since February and has not closed. Two consecutive measurement points showing the same 2-3 point shortfall make this a cycle-level pattern, not a timing anomaly. The June snapshot: where iPhone users stand on iOS 26On iPhones released in the last four years, 86% run iOS 26. Pull in older compatible hardware and the figure drops to 79%. That 7-point spread identifies where the drag is concentrated. Among newer iPhones, 11% remain on iOS 18 and 3% on earlier versions. Across all compatible devices, 14% are still on iOS 18 and 7% on older releases, Apple's data shows, meaning roughly one in five compatible iPhones has not mov