Why iPhone 5 is not compatible? Please mark it as compatible. Since it supports latest iOS 10 it should be compatible.
Why iPad 2 is not in compatible list? It can support iOS up to 9 and your app require 8. I think support of older devices, makes this TeslaSCADA really great. New iPads are expensive. For that price you can but very good HMI. The point here is that you could use old iPads which are inexpensive.
Could you please raise your minimum requirements in App Store so I could test it. I have iPad 1, 2 and iPhone 5. Those are still off a great value but I cannot use non of them. I could forgive iPad 1 not supported. It is really old machine. But even this is unnecessary limitation. If you make it possible to install to iPad 1 then it will open a window from heaven. I can buy iPad 1 for $35 and I believe it still have stronger processor than most HMIs nowadays.