Apple’s first foldable iPhone now has well over 100,000 apps built for it on the App Store, Apple says in a statement to 9to5Mac. Susan Prescott, Apple’s vice president of Worldwide Developer Relations, adds that “thousands of optimized apps are being added to the store each day.” iPhone Duo went on sale on October 23rd.
That count matters more on a foldable than on any other iPhone. An app that hasn’t been updated still opens as a phone-sized window between thick black bars on the 7.6-inch inner screen, as Wired found in one of the first iPhone Duo reviews.
Apple has made the fix simple for apps built the standard way. Rebuilt with the iOS 27.1 SDK, apps that use SwiftUI and UIKit’s standard parts adapt to each screen on their own. They move controls to the side, spread into columns on the inner screen and nudge buttons away from the fold when the phone is partly folded.
Recent updates include Microsoft Word, Outlook, Zoom, Etsy and Halide Mark III, 9to5Mac notes. In its launch announcement, Apple promised Word and Outlook their Duo layouts “in the coming weeks,” with Word’s formatting tools beside a document and Outlook’s inbox next to a full message.
Prescott also credits Apple’s developer workshops. Apple puts the total at over 2,000 developers across more than 50 in-person sessions, the same figures it gave the day before launch.
An app gets the “Made for iPhone Duo” badge on its App Store page once its developer submits iPhone Duo screenshots in App Store Connect, Apple’s developer page says. So the badge shows the developer presented the app on a Duo, not how well it works there.
From April 2027, every app or game submitted to the App Store will need iPhone Duo screenshots. We’ll see how that goes soon enough.
