What size are iPhone Duo screenshots?
iPhone Duo App Store screenshots are 2007 × 2853 px for the inner (folding) display and 1398 × 2034 px for the outer display. Apple also accepts both in landscape (2853 × 2007 and 2034 × 1398), and you can upload 1 to 10 PNG or JPEG screenshots per size.
The two sizes belong to different displays, so they are not alternatives: each display gets its own set. Screenshots must match the size exactly and have no alpha channel.
Frequently asked questions
Which iPhone Duo size is bigger?
The inner display: 2007 × 2853 px (5.7 megapixels) against 1398 × 2034 px (2.8 megapixels) for the outer display.
Are iPhone Duo screenshots portrait or landscape?
Either. Apple lists both orientations for both displays.
Is the inner screenshot the same as the panel resolution?
Use Apple’s screenshot sizes, not the panel resolution: App Store Connect accepts only the sizes on its specifications page.