IIRC even activating the physical card requires an app, which is of course only existing on iphone. Also, the user agreement specifies you need a device which is ApplePay compatible (i.e., iphone). Also, IIRC the card doesn't actually have a number anywhere, so if you ever need to enter it, you're out of luck. And to use the cashback funds, IIRC you need the app again.