Android and iOS screen size


I’m currently developing an app for iOS and Android devices. It’ll be coming out in November, I’ll post it here on the forum when it’s released!
My question is how big should the window size be for it to adapt to mobile screens, and what about responsiveness?

No one?

I used 960x640 for my game and it looked fine on my tablet and phone.
(I’m not saying it’s the perfect size or anything) But I read somewhere it was a recommended size on android games.
I’m unsure about IOS screen sizes and such.

Thanks for your reply! I tried 960x640 but the resolution of the game was very low. Therefore I tried 1920x1080 with no luck however. The graphics look very blurry but they’re large enough to be clear. Do you have any suggestions?