GoKawiilApple details three app display modes for its foldable iPhone Duo
Apple published a developer tech talk explaining how third-party apps will render on the upcoming iPhone Duo foldable display. The system includes three compatibility tiers: a default mode for apps built before iOS 27, an improved layout for apps updated for iOS 27.0, and full-screen support for apps targeting iOS 27.1, which arrives around the device's October launch.