Guides
Short, plain-language guides to getting the most out of iPhone Duo.
iPhone Duo app compatibility, explained
Every App Store app opens on iPhone Duo. What changes is how much of the 7.6-inch inner display it uses — and whether it does anything with the fold. Here is how to read the difference.
Oct 24, 2026 · 3 min read
How to check if an app is optimized for iPhone Duo
A 30-second test to tell whether an app is running in its old phone layout, has been adapted to the inner display, or is truly built for the fold.
Oct 24, 2026 · 2 min read
Preparing your app for iPhone Duo: a developer checklist
What changes for your app on iPhone Duo, which SDK gets you full-screen, and the fold-aware features that earn a Built for Duo listing.
Oct 24, 2026 · 2 min read
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