To help ensure a smooth experience with the RepZio app, we recommend your iPad or iPhone meet some minimum device specs. We suggest your iOS device be equipped with a minimum of  32 GB of storage space and is required to be running iOS 12 or higher.  To maximize the supported life of the device, your device should be able to run the latest version of iOS which is currently iOS 15.  Check the lists below for devices and models compatible with iOS 15.  

iPadOS 15.5 is compatible with these iPads

iOS 15.5 is compatible with these iPhones