How to Make App Store Screenshots for iPhone Duo (Folded and Unfolded)

Quick answer: Treat iPhone Duo screenshots as two products, not one. Show the phone closed when your app is a quick one-handed task, and open when it benefits from the 7.6-inch canvas (reading, editing, side-by-side views). Apple's Duo canvases are squarer than a normal iPhone (1398 x 2034 outer, 2007 x 2853 inner), so don't stretch your tall 6.9-inch layouts; recompose. Native Duo uploads open in App Store Connect later this year. Until then you can still show the Duo inside your regular iPhone set, and SnapMonk's beta Duo mode renders an open device across two adjacent frames with the hinge on the seam.

Apple announced the iPhone Duo on September 9 and I've spent the week since figuring out what it means for store listings. Not the specs part, that's in the iPhone 18 and Duo screenshot sizes post. The design part. What do you actually put in a screenshot for a phone that has two screens and folds in half?

I don't have a Duo in my hands yet (nobody does, it ships October 23). What I do have is Apple's spec, the product photography, and a bunch of Android foldable listings to learn from. Samsung and Google have been doing this for years and most of their developers get it wrong in the same way, so there's a shortcut.

The mistake foldable listings make

They show the open device for every frame. All eight screenshots, phone unfolded, app stretched across the big screen, captions about "immersive" this and "expansive" that.

The problem is that a Duo spends most of its life closed. The outer 5.4-inch screen is where people check notifications, reply to a message, glance at a map. If your app is any of those things, the open-device shot is a lie about how it'll be used. And a buyer who just spent $1,999 wants to know both halves work.

So the first decision is a split, not a choice: which frames show the phone closed, and which show it open.

Closed or open: a quick rule

Show the Duo closed when the frame is about:

• a fast, one-handed action (capture, log, check, reply)
• a notification, widget, or lock-screen moment
• proving the app is comfortable at 5.4 inches, which many apps designed for 6.9-inch phones are not

Show it open when the frame is about:

• content that wants space: documents, timelines, boards, photos, video
• two things at once, either your own split layout or Split View next to another app
• a "continuity" story: start closed, unfold, the view expands

For most utility apps I'd expect roughly two open frames out of a set of six, and the first frame closed. For reading, productivity and creative apps, flip that. Games depend entirely on whether they actually use the inner display well.

Composition on a squarer canvas

A regular 6.9-inch screenshot is 1320 x 2868, an aspect ratio of about 0.46. Tall and narrow. Your caption sits on top, the device fills the bottom two-thirds, and there is very little horizontal room to waste.

The Duo canvases are about 0.69 for both displays. That's closer to a 4:3 tablet than a phone. Three things follow:

1. Captions can go beside the device, not just above it. You have width to spare. A headline left, device right layout that would never fit on a normal iPhone frame works fine here.
2. Device art gets smaller relative to the frame. If you keep the phone the same visual size it will look lost. Either let it bleed off an edge or lean into the white space deliberately.
3. The open Duo is landscape-ish. Opened, the phone is wider than it is tall. On a portrait canvas that leaves a wide, short device with room above and below. Use that space for the caption and a short subline, not for a second device.

Don't take your existing 6.9-inch layout and scale it to fit. It will look like a phone screenshot pasted onto a tablet page, because that's what it is.

Using the hinge

The hinge is the single most recognizable thing about the Duo, and it's a free design element. Two ideas I like:

Span two frames. Put one open Duo across two adjacent screenshots, hinge exactly on the seam between them. Frame one shows the left half of the screen, frame two the right. Scrolled through in the App Store, the device appears to open as the user swipes. Frame one still has to stand alone as a search-result thumbnail, so make sure the left half carries its own caption.

Before and after. Frame one, the phone closed with the compact view. Frame two, open, same content expanded. The caption pair writes itself: "Check it in a second." then "Open it up to work."

Avoid putting UI on the hinge line itself. Apple's own Duo marketing keeps content clear of the fold, and it's a safe bet the store will look better if you do too.

Where this sits in your App Store Connect uploads

Right now: nowhere, officially. Apple's spec lists the Duo sizes but says upload support arrives "later this year." There is no Duo display type in App Store Connect today. When it lands, Duo will be its own screenshot set with two displays, and if you leave it empty Duo users will most likely see your standard iPhone set (Apple hasn't documented the fallback yet, so I'm inferring from how every other class works).

What you can do today is show the Duo inside your regular iPhone screenshots. Plenty of apps already do this with iPad or Watch: a frame in the standard set that says "also great on iPhone Duo" with the device art. It signals you're ready for the hardware, and it's live for the ship date without waiting on Apple.

Doing it in SnapMonk

We added a Duo option to the App Store screenshot generator this month. It sits under the iPhone target, so the output is still a standard 6.9-inch set you can upload today, with the Duo as the device shown in the frames.

Two modes:

• Duo, unfolded. One open Duo spans two adjacent frames, split at the hinge, one of your raw screenshots on each half. Needs at least two screens. With three screens the third frame gets a closed Duo.
• Duo, folded. A closed Duo in every frame, your screenshot on the outer display.

It's marked beta, honestly. We render it from Apple's product photography with hard pixel coordinates for the hinge and each panel's headline, because the first attempts put the hinge 230 pixels off the seam. It's much better now, but if a render looks off, switch back to the standard iPhone and re-render. Native Duo canvases at Apple's 1398 x 2034 and 2007 x 2853 sizes will follow when App Store Connect starts accepting them.

Checklist before Duo uploads open

• Raw captures of your app in both closed and open states from the Duo simulator (Xcode Device Hub support is coming per Apple)
• A decision per frame: closed or open
• Recomposed layouts for the 0.69 aspect ratio, not scaled 6.9-inch frames
• First frame readable as a thumbnail on its own, even if frames one and two span a device
• Nothing important sitting on the hinge line
• Captions that say what the big screen buys the user, not that it exists

FAQ

How do I make App Store screenshots for iPhone Duo? Capture your app in both closed (5.4-inch outer display) and open (7.6-inch inner display) states, decide per frame which state tells the story, and recompose your layouts for the Duo's squarer aspect ratio instead of scaling existing iPhone frames. Native Duo uploads in App Store Connect open later in 2026; until then you can show the Duo as device art inside your standard iPhone set.

Should iPhone Duo screenshots show the phone open or closed? Both, split by what each frame is about. Closed for quick one-handed actions and notifications, open for content that benefits from space or side-by-side views. Showing every frame open is the most common foldable listing mistake because it misrepresents how the phone is mostly used.

What aspect ratio are iPhone Duo screenshots? Roughly 0.69 for both displays: 1398 x 2034 for the outer display and 2007 x 2853 for the inner display. That is much squarer than a regular iPhone's 1320 x 2868 (about 0.46), so captions can sit beside the device and device art needs to be re-sized, not just re-placed.

Can I upload iPhone Duo screenshots to App Store Connect now? No. Apple's screenshot specification lists the Duo sizes but notes that upload support in App Store Connect will be available later this year. There is no Duo display type yet.

Can SnapMonk generate iPhone Duo screenshots? Yes, in beta. The Duo option under the iPhone target renders an open Duo across two adjacent frames (hinge on the seam) or a closed Duo in every frame, inside a standard 6.9-inch App Store set you can upload today. Native Duo-size canvases will be added when App Store Connect accepts them.

What should the first iPhone Duo screenshot show? Something that works as a thumbnail in search results on its own. For most apps that's the phone closed with your strongest single outcome, because search results show frames one to three and users decide there. If you span an open Duo across frames one and two, the left half still needs its own complete caption.

Related reading

• iPhone 18 and iPhone Duo App Store screenshot sizes: the spec numbers and what changed
• How to design App Store screenshots: the fundamentals that still apply on a foldable
• Screenshot mistakes killing your install rate: the failure patterns to avoid on any device
• App Store screenshot sizes guide: every current display class