What versions of xMatters for iOS and Android are currently supported?
All platforms of xMatters on Demand Web App, iOS mobile app, Android mobile app
The currently supported versions of iOS and Android can be found on the respective download page of the app:
As of January 2020 these are:
Apple: Requires iOS 12.0 and watchOS 4.0 or later. Compatible with iPhone, iPad, and iPod touch.
Android: 7.x (Nougat), 8.x (Oreo), 9.x (Pie) and 10.