October 5, 2026 · 11 min read

iPhone Duo App Store Screenshots: Sizes and Setup

Short answer: iPhone Duo is the first iPhone with two App Store screenshot sizes, one per screen: 2007 × 2853 px for the 7.6-inch inner display and 1398 × 2034 px for the 5.4-inch outer display (or the same pairs in landscape). App Store Connect has an iPhone Duo slot that takes either size. Duo screenshots are optional for now, but Apple's specifications say they will be required starting in April 2027 for any app using the iOS 27.1 SDK or later, and your 6.9-inch iPhone set is still the one that is required. Both Duo canvases are close to square (about 1.42 : 1 and 1.45 : 1), so a normal phone screenshot does not fit them: capture the real unfolded layout from the iPhone Duo simulator in Xcode 27.1, build the set, and upload it now.

iPhone Duo is Apple's first foldable. Apple announced it on September 9, 2026, pre-orders open October 16, and it ships on October 23 running iOS 27.1. For anyone who makes App Store screenshots, it is also the first iPhone that brings two new screenshot sizes at once — one for the 7.6-inch inner display and one for the 5.4-inch cover screen — and neither of them is shaped like a phone.

This guide covers what Apple has actually published, what is still missing, why your existing screenshots will not carry over, and how to build both Duo sets in Screenshot Bro and upload them to App Store Connect.

iPhone Duo Screenshot Sizes

Apple's screenshot specifications list iPhone Duo as its own entry with two sizes. Each accepts portrait or landscape:

The general rules do not change: JPEG, JPG or PNG, no alpha channel or transparency, and one to ten screenshots per set. What changes is the shape. Every iPhone since the X has had a tall canvas of roughly 2.17 : 1. The Duo inner display is about 1.42 : 1 and the cover screen about 1.45 : 1. On paper, the inner screen is much closer to a 13-inch iPad than to any phone.

Optional Today, Required From April 2027

Two facts from that same page shape everything else:

• Duo screenshots are optional, for now. Apple does not require them today. The 6.9-inch set is still the one you must provide if your app runs on iPhone — or the 6.5-inch set if you skip 6.9-inch. But Apple notes that “starting in April 2027, screenshots will be required for any app using the iOS 27.1 SDK or later.”
• App Store Connect accepts them. When we first published this guide, Apple said upload support would be “available later this year.” That line is gone (we checked on October 9, 2026), and App Store Connect now has an iPhone Duo display type: one set per language, which takes screenshots at either Duo size.

Apple has also not documented what someone browsing on an iPhone Duo sees in place of Duo screenshots before you supply any. Do not plan around a guess. Plan around the two things that are certain: your 6.9-inch set has to be good regardless, and the Duo sizes are fixed and published, so the work can be done now.

That makes this a real window. The upload slot is open before the phone ships on October 23. Developers who have a Duo set uploaded and localized by launch day will be among the first listings with native Duo screenshots, on a device whose buyers are, by definition, early adopters looking for apps that use the fold.

Why Your Phone Screenshots Won't Carry Over

The temptation is to take the 6.9-inch set and resize it. That fails for two separate reasons.

The geometry. Fitting a 2.17 : 1 image into a 1.42 : 1 canvas leaves a third of the width empty, or crops a third of the height off. Neither looks intentional, and both waste the one thing Duo screenshots exist to show: more room.

The layout. Apple's preparing your app for iPhone Duo guidance says the outer display behaves like a normal iPhone — compact width, regular height in portrait — but the inner display reports regular size classes in both dimensions. That is the iPad trait combination. If your app adapts to size classes, it will show sidebars, split views and multi-column layouts on the inner screen that never appear on a regular phone. Those are exactly the screens worth putting in a Duo screenshot, and you cannot get them by resizing an iPhone capture.

Your iPad screenshots are not the answer either. They are close in ratio (1.33 : 1 against 1.42 : 1), but they show iPad UI at iPad density, and Duo's inner display has its own proportions. Capture the screens your app really renders on the device.

Capturing Duo Screenshots Without the Device

You do not need the hardware. Xcode 27.1 includes an iPhone Duo simulator, and Apple's guidance lays out three tiers depending on which SDK your build uses:

• Built before the iOS 27 SDK: on the inner screen your app runs at “a familiar size and aspect ratio” — not full screen.
• iOS 27 SDK: the app extends into the area beside the status bar on the inner display.
• iOS 27.1 SDK: the app extends to the edge of the screen, and standard navigation and toolbar buttons lay out vertically under the status bar.

For store screenshots, only the last one is worth capturing. A screenshot of your app sitting at a compatibility size inside the bigger screen advertises the opposite of what a Duo buyer is looking for. Build with the 27.1 SDK, run the iPhone Duo simulator, and use its open, close and rotate controls to capture both screens from the same session.

Prepare the simulator the way you would for any store capture: set a clean status bar with xcrun simctl status_bar, load realistic demo content, and capture with xcrun simctl io booted screenshot or ⌘S. Our simulator screenshot guide has the full commands. Then check the pixel size of what the simulator saved — when your capture goes inside a device frame, the exported image takes the row's size, not the capture's.

Which Screen Should Lead?

You will design two sets, but they do different jobs — and App Store Connect gives iPhone Duo a single set per language, so decide which one it gets.

The inner display set is the one that sells. Someone who bought a $1,999 foldable wants proof that your app uses the space. Lead with the view that only exists unfolded: a sidebar with content, a document beside its outline, a map beside a list, two panes of an editor. If your inner-screen layout is just your phone layout made wider, fix the app before you fix the screenshots.

The outer display set is about speed. The cover screen is what people use without opening the phone — checking, replying, starting a timer, glancing at a widget-like view. Lead with the action someone can finish in a few seconds with one hand.

Consider landscape for the inner set. At 2853 × 2007 the inner screen in landscape is a natural fit for split views and media apps, and Apple accepts either orientation per set. Split View — two apps side by side on iPhone for the first time — is one of the features Apple leads with, so a landscape shot of your app holding its own beside another is on-message.

Design Notes for a Near-Square Canvas

• Less vertical room for a headline. On a 2.17 : 1 phone canvas you can stack a two-line caption above a full device. At 1.42 : 1 that stack crowds fast. Keep captions to one short line, or put the caption beside the device instead of above it.
• Show the fold, once. One image of the phone half open or seen from the back tells shoppers immediately that this listing was made for their device. More than one is decoration.
• Mind the cover screen's corners. The outer display is not a symmetric rounded rectangle: its corners are almost square on the hinge edge and well rounded on the free edge. A generic rounded mask leaves gaps or clips UI. Use a frame built for it.
• Keep the sets consistent. Same palette, same type, same order of ideas as your 6.9-inch set. A shopper can see both on different days; they should read as one product.
• Follow the usual content rules. No prices, no “new on iPhone Duo” claims you cannot back up, no other platforms' logos. Our rejection guide lists what App Review flags.

Building iPhone Duo Screenshots in Screenshot Bro

Screenshot Bro has native iPhone Duo frames from version 4.15 onward. Version 4.21 added a size preset for each Duo screen and uploads to App Store Connect's iPhone Duo slot.

1. Add a row per Duo screen

Add a new row with the dashed + tile under your existing rows. In the inspector, under Screenshot Size, open Presets and pick iPhone Duo Inner Display (2007 × 2853). Add a second row with iPhone Duo Outer Display (1398 × 2034) for the cover screen. Orientation flips either one to landscape (2853 × 2007 or 2034 × 1398), and every template in the row exports at exactly that pixel size.

2. Pick the right Duo frame

Drop your simulator captures onto the row. Captures at either Duo size drop into the matching iPhone Duo frame; use Change Device to pick another view. There are three frames, each in Night Sky and Star White:

The inner frame's screen area is exactly 2007 × 2853 and the cover screen's is exactly 1398 × 2034 — the sizes Apple lists — and the closed frame carries the cover screen's asymmetric corners, so captures sit in them without stretching or gaps.

3. Start from the Duo Showcase template

If you want to announce Duo support in your regular listing, the Duo Showcase template lays out all three views — open, closed and open from the back — across a six-screenshot 6.9-inch row (1320 × 2868), with a night-sky gradient behind them. Several screenshots hold more than one phone, so drop a capture onto each frame rather than relying on a batch import. The 6.9-inch row uploads to the regular iPhone slot, so Duo owners and everyone else see it. Since 4.21 the template also has an iPhone Duo Inner Display row and an iPhone Duo Outer Display row, with the outer row excluded from App Store Connect uploads so the inner one fills the Duo set.

4. Upload one Duo row per language

Screenshot Bro uploads to App Store Connect directly, free tier included, and it detects each row's display type from its size: a 2007 × 2853 or 1398 × 2034 row goes to iPhone Duo. Because Duo has one set per language, only one row can fill it. Turn on Exclude when uploading to App Store Connect in the row inspector for the Duo row you are not uploading — usually the outer one. It stays in the project and in folder exports. If an iOS version would go out with no Duo screenshots at all, the upload wizard warns you.

5. Localize once

Duo rows are ordinary rows, so the same translations cover them. Add your languages once and every row — 6.9-inch, iPad, Duo inner, Duo outer — renders in each one. Text that no longer fits the narrower caption space is flagged with an orange outline, which matters more on a near-square canvas. See the localization guide for the workflow.

iPhone Duo Screenshot Checklist

• Your 6.9-inch iPhone set is finished and live — it is still the required one.
• Your app builds with the iOS 27.1 SDK and runs edge to edge on the Duo inner display.
• Captures come from the iPhone Duo simulator, with a clean status bar and demo data.
• An inner-display set at 2007 × 2853 (or 2853 × 2007) leads with a layout that only exists unfolded.
• An outer-display set at 1398 × 2034 (or 2034 × 1398) leads with a one-handed action.
• Captions fit a near-square canvas in every language you ship.
• PNG or JPEG, no alpha channel, one to ten images per set.
• One Duo row per language goes to App Store Connect's iPhone Duo set; the other is excluded from uploads.
• If you build with the iOS 27.1 SDK, you have Duo screenshots in place before the April 2027 requirement.

The Short Version

iPhone Duo adds two screenshot sizes, 2007 × 2853 for the inner display and 1398 × 2034 for the cover screen. Both are optional for now — from April 2027 Apple requires them for any app using the iOS 27.1 SDK or later — and App Store Connect already takes them in one iPhone Duo set per language. Neither is phone-shaped, so your current screenshots will not convert — capture the real unfolded layout in the Xcode 27.1 simulator instead. The slot is open before the October 23 launch, so build the set now and have it live when the first Duo owners open the App Store.

For the full list of display classes Duo sits alongside, see App Store screenshot sizes.