Our iOS app is currently supported on devices with iOS 12.0 or later. If you are on an iOS version lower than 12.0, you will first need to update iOS before downloading the Kisi app. This is because the App Store will not show app versions that are incompatible with your mobile operating system. You can find a list of compatible devices in this Apple knowledge base article.
For the Android app, we currently support devices on Android 7 or later.