Apple reports 74% of devices launched in the past four years now run iOS 26, while 66% of all devices use the update. This marks slower adoption than iOS 18 (76% after 127 days) and iOS 17 (76% after 139 days). iOS 26, released September 15, 2025, dropped support for iPhone XS, XS Max, and XR models, likely impacting uptake. iPadOS 26 adoption mirrors this trend at 66% for recent devices, down from iPadOS 18's 63% at the same stage. Apple also released iOS 18.7.5 for users hesitant to switch, offering security fixes without full transition. MacOS Tahoe data remains undisclosed, leaving a gap in cross-device update analysis.