Thank there. Currently, we are supporting the latest iOS versions i.e, starting at 11.0. iOS 9.3.5 was released 2 years back and after that, there are many iOS versions that have been released but will be adding support for 9.3.5 too. As the iOS App is yet to be live on App Store but before making it live we will add full support for iOS 9 too. Cheers!
RE: Actifit App iOS Version