Apple has officially added a dedicated iPhone Duo screenshot category to its App Store Connect screenshot specifications.
This is an important update for iOS developers because Apple’s foldable iPhone has two different screen experiences: a compact outer display and a larger inner display. Apple now lists separate App Store screenshot dimensions for both screens.
Developers preparing an existing or upcoming application for Apple’s foldable iPhone should understand these new iPhone Duo App Store screenshot requirements before submitting an update for review.
Official iPhone Duo App Store Screenshot Sizes
According to Apple’s official App Store Connect documentation, these are the accepted screenshot dimensions for the iPhone Duo.
| Display | Orientation | Screenshot size |
|---|---|---|
| Outer display | Portrait | 1398 × 2034 pixels |
| Outer display | Landscape | 2034 × 1398 pixels |
| Inner display | Portrait | 2007 × 2853 pixels |
| Inner display | Landscape | 2853 × 2007 pixels |
These are exact pixel dimensions. App Store Connect validates uploaded screenshots, so developers should avoid using approximate dimensions or stretching an existing image to fit.
iPhone Duo Outer Display Screenshot Requirements
The outer display is used while the iPhone Duo is folded. Apple accepts the following outer-display sizes:
- 1398 × 2034 pixels for portrait screenshots
- 2034 × 1398 pixels for landscape screenshots
The outer screen is intended for compact interactions. Your app should keep its primary navigation, content and important buttons accessible without making the interface feel crowded.
Screenshots for this display should show what users can accomplish without unfolding the device. For example, a navigation app could show nearby locations, while a task app could display today’s most important tasks.
iPhone Duo Inner Display Screenshot Requirements
When the device is opened, users get access to the larger inner display. Apple accepts these screenshot sizes:
- 2007 × 2853 pixels for portrait screenshots
- 2853 × 2007 pixels for landscape screenshots
The expanded screen provides more room for productivity, media, maps, dashboards and multitasking. Developers should use this space intentionally instead of simply stretching the standard iPhone layout.
A well-designed inner-display experience might include:
- A list and detail screen displayed together
- A larger map with nearby-place information
- A persistent navigation panel
- Multiple columns in a dashboard
- Editing tools beside the main content
- More information without unnecessary scrolling
Supported Screenshot Formats
Apple allows developers to upload between one and 10 screenshots in a supported screenshot category.
The accepted file formats are:
.jpeg.jpg.png
Are iPhone Duo Screenshots Mandatory?
Apple’s specification page confirms that App Store Connect now supports screenshots created specifically for the iPhone Duo. However, the presence of this category does not necessarily mean that every existing iPhone app must immediately upload all four screenshot versions.
The requirement may depend on:
- Whether the app supports iPhone Duo
- The SDK used to build the submitted version
- The supported device families
- The orientations supported by the app
- Whether App Store Connect marks the screenshot section as required
Developers should open the app’s product page in App Store Connect and check the Media Manager. If an iPhone Duo screenshot section is marked as required, suitable images will need to be uploaded before submitting the version for review.
Even when App Store Connect can reuse or scale screenshots from another iPhone display, dedicated iPhone Duo images may provide a better product page because they demonstrate how the app uses both screens.
Screenshots Do Not Make an App Compatible
Uploading an image with the correct dimensions does not automatically make an app compatible with the iPhone Duo.
The application itself must be tested on the outer and inner displays. Developers should verify that the interface adapts properly when the available width, height or orientation changes.
A complete preparation process should include:
- Build the app using Apple’s supported Xcode and SDK versions.
- Run it using an iPhone Duo simulator or supported device.
- Test both the folded and unfolded configurations.
- Check portrait and landscape modes supported by the app.
- Fix clipped, stretched or incorrectly positioned elements.
- Test keyboards, sheets, dialogs, menus and navigation.
- Capture final screenshots after the interface is stable.
Important Areas Developers Should Test
1. Responsive layouts
Avoid interfaces built around a fixed screen width. The layout should respond to the space available on the current display.
2. Folded and unfolded transitions
Changing between the outer and inner displays should not unexpectedly reset navigation, form data, the selected tab or the user’s current task.
3. Dialogs and bottom sheets
A dialog designed for a compact screen could become uncomfortably wide on the inner display. Applying sensible width constraints can improve readability.
4. Navigation
The outer display may use conventional bottom or stack-based navigation. The larger inner display may have enough room for persistent navigation or a list-and-detail structure.
5. Images and videos
Media should resize without distortion or excessive cropping. Video players should also respond correctly to changes in screen size and orientation.
6. Safe areas
App content should respect system-provided safe areas and must not be hidden behind display cutouts, the hinge area or system interface elements.
Guidance for Flutter Developers
Flutter developers should avoid checking only for a particular iPhone model or hard-coding one screen resolution.
Responsive Flutter layouts can use:
LayoutBuilderMediaQuery.sizeOf(context)FlexibleExpandedSafeArea- Maximum-width constraints
- Width-based layout breakpoints
Instead of increasing the size of every widget on the larger screen, reorganise the interface when enough width becomes available.
For example, an app could display a single list on the outer screen and switch to a list-and-detail layout on the inner screen. This approach provides more value than simply stretching the same content.
How to Create iPhone Duo App Store Screenshots
- Open the app using an iPhone Duo simulator or supported device.
- Select the outer or inner display configuration.
- Navigate to a screen that clearly presents one important feature.
- Remove debug labels, test information and personal data.
- Capture the app in the required orientation.
- Export the final design using the exact accepted dimensions.
- Confirm that the file does not contain transparency.
- Upload it to the correct iPhone Duo section in App Store Connect.
- Preview the product page before submitting the version for review.
Tips for Better iPhone Duo Screenshots
A strong App Store screenshot should communicate one benefit immediately. Keep the headline short and use real screens taken from the application.
Outer-display screenshots should focus on fast and essential interactions. Inner-display screenshots should demonstrate how the app benefits from the additional screen space.
Avoid using:
- Features that are not available in the app
- Incorrect or unrealistic iPhone Duo frames
- Small or excessive promotional text
- Transparent backgrounds
- Stretched or distorted app screens
- Competitor logos and copyrighted media
- Repeated messages across every screenshot
What This Means for Existing iPhone Apps
Developers with applications already available on the App Store should begin testing how their interfaces behave on iPhone Duo.
Apps built using responsive layouts may require only minor changes. Applications that depend on fixed sizes, fixed aspect ratios or model-specific conditions may require more work.
It is better to test compatibility before starting the next App Store submission. This gives developers time to fix the real interface and produce accurate screenshots instead of creating marketing images for an experience that has not been properly tested.
Frequently Asked Questions
What is the iPhone Duo outer-display screenshot size?
The accepted dimensions are 1398 × 2034 pixels in portrait and 2034 × 1398 pixels in landscape.
What is the iPhone Duo inner-display screenshot size?
The accepted dimensions are 2007 × 2853 pixels in portrait and 2853 × 2007 pixels in landscape.
How many screenshots can be uploaded?
Apple allows developers to upload between one and 10 screenshots in JPEG, JPG or PNG format.
Can an iPhone Duo screenshot have a transparent background?
No. Apple states that screenshots cannot contain alpha channels or transparency.
Do I need screenshots for both displays?
Apple provides separate specifications for the inner and outer displays. Check your app’s Media Manager to determine which screenshot slots App Store Connect requires for your submitted build.
Final Thoughts
Apple’s new iPhone Duo screenshot specifications give developers exact dimensions for presenting applications on the foldable device’s outer and inner displays.
The confirmed dimensions are:
- 1398 × 2034 or 2034 × 1398 pixels for the outer display
- 2007 × 2853 or 2853 × 2007 pixels for the inner display
Developers should not treat this as only a screenshot-resizing task. The real priority is ensuring that the app provides a polished, responsive and stable experience in both folded and unfolded configurations.
Apple Developer — App Store Connect Screenshot Specifications
