Foldable iPhone Duo: How to Prepare Your Screenshots

Those shapes are very different from other iPhones. Your current screenshots won't simply fit.

I read Apple's screenshot specifications page for these numbers, and every size below comes from it.

The iPhone Duo is Apple's first foldable iPhone.

Wikipedia's iPhone Duo entry says Apple announced it on September 9, 2026, alongside the iPhone 18 Pro and iPhone 18 Pro Max. Release is set for October 23, 2026, in about 70 countries and regions, with preorders from October 16.

It uses a book style fold. Closed, a 5.4 inch outer display works like a normal phone. Open, a 7.6 inch inner display gives a workspace Wikipedia compares to an iPad mini.

That second screen is why it gets its own screenshot sizes.

Here's the iPhone Duo entry from Apple's screenshot specifications, exactly as listed:

• Outer display, portrait. 1398 × 2034 pixels.
• Outer display, landscape. 2034 × 1398 pixels.
• Inner display, portrait. 2007 × 2853 pixels.
• Inner display, landscape. 2853 × 2007 pixels.

The same page sets the general rules. You can upload one to 10 screenshots, in .jpeg, .jpg or .png format.

It also warns that images can't include alpha channels or transparencies. That trips up plenty of PNG exports, so flatten every file before upload.

This is the key detail for timing.

Apple's note on the iPhone Duo entry says support for uploading assets for this device in App Store Connect will be available later this year.

So right now you can't add Duo screenshots to your listing. You can only prepare them.

That's actually useful. The phone ships on October 23, and upload support follows later. You have time to design properly instead of rushing.

App Store Connect's release notes are a good place to watch for the change.

The numbers look odd until you compare the ratios. I worked them out from Apple's sizes.

The Duo's outer portrait screenshot is 2034 divided by 1398, about 1.45 to 1. The inner portrait one is 2853 divided by 2007, about 1.42 to 1.

Now compare a 6.9 inch iPhone. Apple lists 1320 × 2868 pixels, which is about 2.17 to 1. That's a much taller, narrower shape.

A 13 inch iPad, at 2064 × 2752 pixels, is about 1.33 to 1.

So both Duo displays sit between a regular iPhone and an iPad. They're much closer to the iPad.

Because the shapes differ so much, you can't stretch or crop a normal iPhone screenshot into a Duo one.

A 6.9 inch screenshot is roughly 2.17 times as tall as it is wide. The Duo's outer display is about 1.45. Squeezing one into the other would either distort the image or cut off a large part of it.

The layout of your app will also change. Wikipedia notes that iOS adapts the interface depending on whether the display is open, partly folded or closed.

So the Duo needs its own captures, taken from the app running at those sizes.

Since the Duo's shapes are close to the iPad's, your iPad screenshots are a better starting point than your iPhone ones.

If your app already has a good iPad layout, the inner display will probably look similar. The captions, background and ordering you designed for iPad may carry over with small changes.

If your app has no iPad layout, the Duo's inner display may expose that. A phone layout stretched across a wide screen often looks empty.

That's worth fixing in the app itself, not just in the screenshots. People will see the real thing once they install.

The outer display is the one people use closed, like a normal phone. But its shape is much wider than a standard iPhone screen.

That changes composition. Tall stacks of content that fill a 6.9 inch screenshot will look short and wide here.

Keep your captions short. A wide, short image leaves less room above and below the app screen for text.

Use your most important screen first, as you would on any listing. The first image still does most of the work.

Test every caption at the size a buyer will see it, on a real phone, before you commit.

The inner display is where the Duo stands out. It's the reason people buy a foldable.

Use these screenshots to show what your app does with extra space. Side by side panels, larger media and more visible content all make the case.

If your app shows the same single column on a bigger screen, the screenshot will show that too. Customers notice.

Think about landscape as well. Apple lists both portrait and landscape sizes for the inner display, and some apps look far better wide.

Pick the orientation that shows your app at its best, and keep one orientation per set.

Android foldables have been around for years, so there's some prior experience to borrow.

On Google Play, large screen screenshots show off apps that adapt to bigger displays. We covered how that works in our post on tablet and foldable screenshots for Play.

The main lesson carries over. Show the app using the larger screen well, not a phone layout with empty space around it.

The details differ between stores, so follow Apple's own sizes for the Duo. But the design thinking is the same.

You'll need real captures at the exact pixel sizes Apple lists. Apple validates dimensions, so close isn't good enough.

The cleanest route is capturing from the app running at the Duo's sizes. Check that your development tools support the Duo before you plan a capture session.

Whatever tool you use, check the final file size in pixels before upload. A screenshot that is a few pixels off will be rejected.

We explained why Apple is so strict about pixel sizes in our guide to iPhone screenshot sizes.

Many listings place screenshots inside a device frame, with a caption and background.

I checked our own frame list before writing this. PlayMockUp's device frames currently include the iPhone 14 and several Android phones, tablets and laptops. There's no iPhone Duo frame yet.

For the Duo, a plain screenshot with a caption and background is a safe choice anyway. A frame shrinks the app screen, and the Duo's wide shape already leaves less room.

If you do use a frame, make sure it matches the actual device. Showing a different phone than the one listed confuses buyers.

The general rules from Apple's page apply to the Duo too.

Upload one to 10 screenshots per set. Use .jpeg, .jpg or .png.

Remove transparency. Apple says images can't include alpha channels or transparencies, so export PNGs without an alpha channel, or use JPEG.

Match the pixel sizes exactly. Use the portrait or landscape sizes Apple lists, not something close.

If you're unsure which format to use, our post on PNG or JPG for store screenshots compares the two.

Some questions don't have public answers yet, and it's better to say so than guess.

Apple's page doesn't say whether Duo screenshots will be required. For other iPhone sizes, it lists what's required and when it scales a larger size instead. The Duo entry only has the note about upload support coming later.

It also doesn't say how the App Store will show Duo screenshots to buyers on each display.

When upload support arrives, check the specifications page again. The rules for requirements and scaling may be added then.

Here's what to do before uploads open.

This week. Check how your app looks on both Duo displays, open and closed. Fix any layout that looks empty or cramped.

Next. Pick your screenshot order. Start from your iPad set if you have one.

Then. Design captions for the wider shapes, and decide on portrait or landscape for the inner display.

When uploads open. Capture at Apple's exact sizes, flatten transparency and upload.

You can build the layouts in our free screenshot editor while you wait.

The Duo is one new device. Not every app needs to rush.

It's worth it if your app benefits from a larger screen. Reading, video, productivity, design and games that use extra space all have something to show.

It's less urgent for apps that look the same on every screen. Wait for Apple to confirm whether Duo screenshots are required.

Either way, checking your app's layout on the inner display is worth doing now. Buyers of a foldable will notice an app that ignores the big screen.