You can check which version you have installed at the bottom of the Settings menu (to get there just tap the gear icon on the top right corner of the home tab). The app version is always in this format: X.X.X / vXX (e.g. 1.4.2 / v26).
e.g. iPhone 8 or Samsung Galaxy S9+ etc.
e.g. iOS 13.1 or Android 10.0 etc.
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