Hi there. Let us predict the possible minimum requirements to just run as well as to run really well future iOS versions. Let us start with iOS 11 for those who don’t know already. iOS 11 Minimum A7 + 1GB RAM iPhone 5s iPad Air or Mini 2 Retina Recommended Most A8 + 2GB RAM (perhaps even A8X) iPhone 6s or SE iPad Mini 4 (perhaps?), iPad Air 2, iPad 2017, any iPad Pro iOS 12 Minimum A8 (unlikely to be A7 but possible) 1GB RAM (perhaps even 2GB RAM) iPhone 6 (perhaps iPhone 5s, unlikely to be iPhone SE or 6s, that’s highly improbable) Highly likely to be iPad Mini 4 or above, Recommended A9 maybe even A9X or A10 2GB RAM min, maybe more to run really well. iPhone 6s or iPhone 7 or above. Certainly no higher than an iPhone 7+ Difficult to predict so soon. Could be as low as an iPad 2017 or as high as any device with 4GB RAM. Realistically I would say any iPad Pro any gen is a good middle bet. iOS 13 Minimum A9 2GB RAM iPhone SE or iPhone 6s iPad 2017 or any iPad Pro. If we are lucky then even iPad Air 2 but that might not happen. Recommended A10X or A11 3GB RAM or more iPhone 8. Min. iPad Pro 2nd Gen.