I have an app that runs slowly on an iPhone 3G but is fast enough on an iPhone 3G S.
Is there a way to limit the app to be available only for iPhone 3G S and faster devices? I would like to avoid bad comments because 3G or even 2G users download it and then complain about it being too slow.
You can set minimum capabilities required to use your application by providing values for the UIRequiredDeviceCapabilities key in your application's Info.plist. In this case, I'd recommend using the opengles-2 capability, because all iOS devices with the post-iPhone 3G S faster hardware support OpenGL ES 2.0 and none of the ones before that do.
For more on these capabilities see Apple's documentation here.
来源：https://stackoverflow.com/questions/3472278/how-do-i-make-my-application-available-on-the-app-store-only-for-iphone-3g-s-or