iPhone Duo App Store Screenshot Sizes: Outer 1398×2034 and Inner 2007×2853 Explained

iPhone Duo adds two new screenshot slots, not one

Apple announced iPhone Duo, its first foldable iPhone, on September 9, 2026. Pre-orders opened October 16 and the device ships October 23. For anyone who maintains an App Store listing, the important part is easy to miss: App Store Connect now has an iPhone Duo screenshot class, and it contains two separate canvases — one for the outer display you see when the phone is closed, and one for the inner display you see when it is open.

This guide covers the exact pixel sizes, when Duo screenshots become mandatory, why your inner-display captures need a small resize, and how to produce both sets without doubling your design work. Every number below comes from Apple’s Screenshot specifications and the iPhone Duo technical specifications. If anything here ever disagrees with Apple’s pages, Apple wins.

iPhone Duo screenshot sizes at a glance

The rest of the rules match other iPhone classes:

• .jpeg, .jpg, or .png
• 1 to 10 screenshots per size
• No alpha channel or transparency — a transparent PNG will be rejected at upload

Apple’s marketing says both displays “share the same aspect ratio,” which is true for the user experience: content scales proportionally as you open the phone. At the pixel level, though, the two screenshot canvases are not identical (roughly 0.687 width-to-height for the outer canvas versus 0.703 for the inner). Treat them as two exports, not one image stretched twice.

When are iPhone Duo screenshots required?

Apple’s specifications page says that starting in April 2027, screenshots will be required for any app using the iOS 27.1 SDK or later. Apple’s October 5 developer news post, “Prepare and submit your apps for iPhone Duo,” puts it similarly: from April 2027, apps and games you submit will need to include iPhone Duo screenshots.

Until then they are optional — but there’s a concrete reason not to wait. When you submit iPhone Duo screenshots, your product page displays a badge telling people your app is optimized for iPhone Duo. In the weeks after launch, early Duo owners are actively looking for apps that take advantage of the big screen. The badge is a cheap, visible signal at exactly the right moment.

A sensible timeline:

1. Now: build with Xcode 27.1 and check your layouts on iPhone Duo (Apple’s Device Hub lets you preview poses and orientations).
2. Around launch (late October): upload outer and inner screenshot sets and pick up the badge.
3. Before April 2027: make Duo screenshots part of every submission checklist.

Your existing required iPhone size doesn’t change: you still need the 6.3-inch “iPhone with Dynamic Island (medium display)” set at 1206×2622 or 1179×2556. The full chart is in our App Store screenshot sizes 2026 guide.

Outer display: native captures are already the right size

The outer display is a 5.4-inch panel with a physical resolution of 1398 × 2034 at 460 ppi — exactly the size App Store Connect wants for the outer slot. A screenshot taken on a closed iPhone Duo can go straight into your template.

What will look different is the UI itself. According to Apple’s Human Interface Guidelines, the outer display is wider and shorter than other iPhone screens, so the system moves toolbars, tab bars, and navigation controls to the side of the display to preserve vertical space. If your tab bar shows up as a vertical rail in your captures, that’s expected. Show it as it is; don’t retouch it back into a bottom bar.

Inner display: scale 1878×2670 up to 2007×2853

The inner display is a 7.6-inch folding panel. Apple lists its resolution as 1878 × 2670 (portrait, 430 ppi), but App Store Connect asks for 2007 × 2853. That means a raw inner-display screenshot won’t upload as-is. You need to scale it up by about 6.9% — 2853 ÷ 2670 ≈ 1.0685 and 2007 ÷ 1878 ≈ 1.0687, so the scale is effectively uniform and nothing gets distorted.

Two easy ways to handle it:

• Use a canvas template. In the screenshot editor, choose the iPhone Duo Inner preset. The canvas is 2007×2853, your capture sits inside it, and the export comes out at the exact accepted size, with or without a device frame.
• Resize directly. Any image editor can upscale 1878×2670 to 2007×2853. The change is small enough that most people won’t notice, though fine text can soften slightly. If you can render at higher quality from the simulator, do that.

Landscape works the same way: 2670×1878 becomes 2853×2007.

Planning two sets without doubling the work

Outer and inner screenshots target the same person holding the device two different ways. A few rules keep the workload manageable:

1. Keep the story order identical. Screenshot 1 is your core outcome, 2 is the main feature, 3 is your differentiator — in both sets.
2. Outer = quick and one-handed. Short headlines, one focal point, close to what you already do for regular iPhones.
3. Inner = big and side by side. Apple’s guidance suggests showing an extra level of hierarchy on the inner display — Mail shows the list and the message together when open. That’s the shot your inner set should lead with.
4. The counts don’t have to match. Three strong inner screenshots beat seven padded ones.

For the frame-by-frame production steps, see how to make iPhone Duo mockups and screenshots. For conversion strategy, see iPhone Duo ASO and screenshot design tips.

What about app previews?

On Apple’s app preview specifications page, iPhone Duo’s accepted resolutions are 886 × 1920 (portrait) and 1920 × 886 (landscape) — the same accepted sizes as other modern iPhone classes — with a length of 15 to 30 seconds. If you already have an 886×1920 preview, it’s a reasonable starting point. Apple notes that a preview in a different aspect ratio from your screenshots appears in the “A Closer Look” section of the product page. For whether a video is worth it at all, read app preview video vs screenshots.

Exporting both Duo sets with AppShotMaker

1. Open the screenshot editor and pick the iPhone Duo Outer preset (1398×2034).
2. Drop in your outer captures, add headlines and a background. If you want a device frame, open the iPhone Duo group in the device panel and choose an outer (closed) frame — Night Sky or Star White, each in style A or B.
3. After three to five screenshots, switch to iPhone Duo Inner (2007×2853), swap in your inner captures, and choose a matching inner (open) frame.
4. Export the zip and upload each set to its own iPhone Duo slot in App Store Connect.

Everything runs locally in your browser; your screenshots aren’t uploaded to our server. If you only need a single framed image for a website or social post, the device mockup tool is faster.

FAQ

What do Duo users see if I don’t upload Duo screenshots? Apple’s specifications page doesn’t spell out a scaling fallback for the Duo class the way it does for older iPhone sizes. What is clear: skipping Duo screenshots won’t block submission before April 2027, but you won’t get the optimized-for-iPhone-Duo badge.

Can I use landscape screenshots for the inner display? Yes — 2853×2007 is an accepted size. Keep in mind that, per Apple’s HIG, inner-display landscape layouts put controls on the side, while inner portrait keeps standard horizontal bars. Pick the orientation where your app looks its best.

Can I just scale my 6.3-inch screenshots to fit the outer slot? No. The 6.3-inch canvas (1206×2622) is far narrower than the outer canvas, so you’d end up with heavy distortion or big empty margins, and the outer display’s side-mounted controls wouldn’t be represented.

Can I put an iPhone Duo device frame in my screenshots? Many apps do. Apple has published iPhone Duo product bezels (Photoshop and PNG) in its Design Resources; review Apple’s marketing guidelines before using them. Make sure any frame matches the real device proportions — see our device mockup best practices.

My upload says the dimensions are wrong. What should I check? First, check for an alpha channel (the most common cause with PNG exports). Then make sure outer and inner images weren’t swapped between slots, and that portrait and landscape weren’t mixed up.