If I could get PowerApps to tell me the actual resolution (or at least aspect ratio) of the device or web browser where an app launches, I could use logic to resize and reposition anything in the app. This would be so useful, and would make the app at least appear to be responsive to the device.
For example, we could use logic to set the OnStart value to say:
Then we could reference the "AspectRatio" variable we set when the app launched for everything else. As an example of this, let's say you want to show an image covering the whole width of the app if the app launches with a portrait aspect ratio, but you only want it to cover half the width of the app if it launches with a landscape aspect ratio. You could do that referencing the "AspectRatio" variable to set the image width like this: