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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteTo check whether an iPhone app supports different screen sizes, run it in Simulator on the smallest and largest layouts you intend to support, then inspect its key screens in every supported orientation, at larger text sizes, and with longer localized text. Look for clipped content, overlapping controls, or actions that become hard to reach. Simulator is a useful first check; a physical iPhone can complement it. Store screenshots and hardware-eligibility declarations are separate from runtime interface support.
What “screen-size support” means
An app supports different screen sizes when its interface adapts to the space available, rather than merely launching on a device. Apple’s Layout guidance says apps need to adapt to display sizes, orientation changes, window sizes, and multitasking states. In practice, check that content remains readable and that navigation, forms, and primary actions remain usable as the available width and height change.
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Size classes can vary with the device and window configuration. Base layout decisions on the available space and relevant size classes, not solely on a particular iPhone model or a portrait-versus-landscape label. Also account for larger text and localization: both can change how much room content needs.
Run a representative check in Simulator
There is no universal list of iPhone models that every app must test. Choose representative configurations based on the app’s supported iOS versions, orientations, features, and actual hardware requirements. Start with the smallest and largest layouts relevant to your intended support range, then exercise the same important flows in each.
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- Define the range. Record the iOS versions and orientations the app supports, the key screens and flows to review, and any hardware capability the app genuinely requires.
- Inspect the layout approach. Look for fixed widths or layout branches tied only to a device model or orientation. Prefer adaptive behavior based on available space and system layout guides. Apple recommends SwiftUI or Auto Layout; for UIKit, its view layout overview describes stack views and constraints for responding to changes such as rotation, window resizing, text size, and language.
- Launch the app in Simulator at the smallest and largest relevant layouts. In each, check navigation, primary actions, forms, scrolling, keyboard presentation, and content near screen edges. Make sure important controls remain visible or reachable when the keyboard is open.
- Exercise supported changes in available space. Rotate the simulated device if the app supports that orientation. Change text size and inspect screens with longer localized strings. Look for clipping, overlap, controls that become difficult to reach, or content that no longer scrolls.
- Capture comparable evidence. Device Hub can capture screenshots and videos from simulated and physical devices. Compare the same flow across configurations and use the captures to document layout, translation, or accessibility issues. See Apple’s Device Hub documentation.
Apple recommends previewing across devices, orientations, localizations, and text sizes. A physical iPhone is a useful complementary check when practical, but testing one device does not establish that every layout works.
What to compare across configurations
- Available width and height: Check the smallest and largest target layouts and the size-class combinations the app encounters.
- Orientation: Check portrait and landscape if both are supported; do not assume a layout that works in one will work in the other.
- Text and language: Compare the default text size with larger Dynamic Type settings and inspect longer localized strings.
- Interaction: Test navigation, forms, scrolling, keyboard use, and access to primary actions—not just whether the first screen appears.
These checks help expose common interface failures, but no single device-size matrix guarantees compatibility. Select configurations that reflect how your app is built and what it claims to support.
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Keep App Store screenshots separate from runtime support
App Store screenshots are listing assets, not proof that an app adapts correctly while running. Apple’s App Store Connect screenshot specifications, accessed in 2026, allow 1–10 screenshots per device size and require at least one screenshot for iPhone with Dynamic Island (medium display). The page lists accepted pixel dimensions by display group and permits scaling down the highest required resolution when the interface is consistent across sizes and localizations. Device groupings and dimensions can change, so check the live specification when preparing a submission.
Use hardware declarations only for real requirements
UIRequiredDeviceCapabilities lets the App Store filter devices based on hardware capabilities an app requires. It is not a screen-size test or a way to certify interface fit. Declare a capability only when the app depends on that hardware; assess layout separately through adaptive design and testing. Apple explains the key in its UIRequiredDeviceCapabilities documentation.
Quick Recap
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