What version of iOS or Android operating system do I need to use Tactus Therapy apps? May 21, 2019 23:51 Updated Follow Current minimum iOS version: iOS 9 Current minimum Android version: 4.1.x Related articles Which platforms or devices are your apps available on? We have lots of devices. How many copies or licenses of each app should I buy? Do your apps require wifi or an internet connection? Can I use your apps on a Mac or PC (Windows) desktop or laptop computer? I bought an app for iOS/Android. Do I have to buy it again for the other operating system?