No, you misunderstand. The retina screen has 4X the pixels. The app, if it doesn't know that it's running on a retina screen, scales itself for the non-retina display. So if the app is 320x480 pixels (non-retina), shown on a retina screen (640x960), there is leftover space. I ran into similar problems with this when making my first app, but it was only happening for images, not the entire view.