Apple has revealed the adoption metrics of iOS 13 and iPadOS within a month following their public release via the stable channel. Apple claims that iOS 13's adoption has reached the 50 percent mark on all active iPhone devices out there. The 50 percent adoption figure for iOS 13 has been achieved in less than a month since it became available. Moreover, Apple has also divulged that iPadOS – a fork of iOS tailored for iPad tablets – is now running on 33 percent of all iPad tablets launched so far.
The developer iPhone 8 pair – 55 percent of them have been updated to iOS 13.

The rest 38 percent of active iPhone devices launched in the last four years are running iOS 12, while the remaining 7 percent are stuck on an older build of iOS. The adoption data of iOS 13 and its older builds have been calculated based on the number of App Store visits as measured on October 15, less than a month after the public iOS 12 last year in nearly the same time frame following its release.
Apple has also shared some insights regarding the adoption rate of iPadOS. As per the data released by the company, 41 percent of all iPad tablets launched in the last four years are currently running iPadOS, 51 percent currently run iOS 12, and the rest 8 percent run an older version of iOS. On a larger scale, 33 percent of all active iPad tablets currently run iPadOS, 51 percent boot iOS 12, while the rest 16 percent are on earlier versions of iOS. The aforementioned data was also amassed based on the number of App Store visits recorded on October 15.