iPhone Duo screenshots for the App Store
From April 2027, Apple requires screenshots for the foldable iPhone Duo. Here is which sizes App Store Connect accepts, who the requirement applies to, and how to capture the images.
By Dominik Ginting, who builds ASODeck · Updated
In short
- Two sizes: the outer display at 1398 × 2034 pixels, the inner display at 2007 × 2853 pixels, each in landscape too.
- Required from April 2027. Apple's specification names apps built with the iOS 27.1 SDK or later; the announcement of October 5, 2026 speaks of all submitted apps and games.
- Unlike the iPhone sizes, Apple names no fallback to scaled images from other devices for iPhone Duo. You provide the images yourself.
- If you submit iPhone Duo screenshots, your product page shows a badge saying the app is made for iPhone Duo.
- App previews need no size of their own. They use the standard iPhone dimensions, 886 × 1920 pixels in portrait or 1920 × 886 in landscape.
The two sizes
iPhone Duo has two displays: a compact one on the outside and a large one inside that appears when you open it. App Store Connect accepts separate screenshots for both, in portrait or landscape.
| Display | Portrait | Landscape | Aspect ratio |
|---|---|---|---|
| Outer (closed) | 1398 × 2034 | 2034 × 1398 | 0.69 |
| Inner (open) | 2007 × 2853 | 2853 × 2007 | 0.70 |
At 0.69 and 0.70, both formats are closer to iPad (0.75) than to iPhone (0.46). A layout built for narrow iPhone images does not simply fit: headline and device need a different split. Every other size for both stores is on the screenshot sizes page.
Who the requirement applies to
Apple words it slightly differently in two places. The screenshot specifications say that from April 2027 the requirement applies to apps built with the iOS 27.1 SDK or later. The App Store Connect release notes of October 5, 2026 say that from April 2027 all submitted apps and games will need to include iPhone Duo screenshots.
In practice: if you submit an update with current Xcode from April 2027, you need the images. Apple has not named an exact day in April yet. It pays to be early anyway, because with iPhone Duo screenshots your product page shows the iPhone Duo badge.
How to capture the images
- Build with Xcode 27.1. It has the SDK for iPhone Duo. According to Apple, apps built with Xcode 26 and earlier do not extend under the status bar and camera, so the images would look different from the device.
- Test in the simulator or on the device. Apple names this as the first step. Check every screen closed, open and partially folded before you take pictures.
- Clean up the status bar. In the simulator, one command sets time and battery to calm values:
xcrun simctl status_bar booted override --time 9:41 --batteryState charged --batteryLevel 100 - Capture every screen twice, on the outer and the inner display. The required dimensions match the resolution of the two displays (Apple lists them in the app preview specifications), so the images need no conversion.
xcrun simctl io booted screenshot duo-inner-01.png - Mind the fold. Apple advises keeping controls out of the fold of the inner display. On a screenshot, the same goes for whatever the image is about.
- Upload. App Store Connect has its own slots for iPhone Duo, separate for the inner and outer display. Up to ten images per slot and language, as PNG or JPEG without transparency.
Text and design
Screenshots may include text and image overlays as long as they show the app in use (guideline 2.3.3 of the App Store Review Guidelines). For iPhone Duo that mostly means: the inner display is large enough for two columns. Show what your app does differently on the large display instead of an enlarged iPhone image.
For marketing images outside the store, the free mockup generator has a foldable device, closed and open.
What is still open
- Whether both slots are required or one is enough, Apple has not said explicitly yet.
- Whether apps that do not specifically support iPhone Duo must provide the images all the same is being asked in Apple's developer forums. A clear answer from Apple is still missing.
As soon as Apple clarifies this, we will update this guide. The date at the top shows how current it is.
Sources
Everything here follows Apple's own pages, read on November 5, 2026.