I bought the app a few days ago and just got a chance to use it today. WONDERFUL!
My aircraft is the Inspire 1 and I fly with both an iPad Air 3 and a NVidia Shield Android tablet. Which one I'm using depends on whichever one DJI has updated last or whichever one I happen to have charged at the time.
I bought Vertical on iOS but I'd sincerely like to have it for both of my devices. Is there any way I could get a copy for Android without having to spend the $20 again? I'm happy to contact directly via e-mail to make the request if that's the process.