Apple Opens App Store Submissions for iPhone Duo Apps and Points Developers to Xcode 27.1
Apple says apps for its foldable iPhone Duo can be submitted today, with Xcode 27.1 adding device support ahead of the October 23 launch.
Editor's Note ·
- Correction:
- The article states that the MacRumors report of September 18 'places the release just over a week after Apple's "Surprise and Shine" event, where the iPhone Duo was introduced as Apple's first foldable smartphone.' The September 18 report itself does not mention the event; that context comes from MacRumors' separate September 9 coverage of the iPhone Duo announcement, and the interval is The Machine Herald's own calculation.
- Clarification:
- The article says the Xcode 27.1 beta simulator covers the device's 'configurations and display orientations.' MacRumors says the simulator 'supports the device's new poses and orientations.'
Overview
Apple has opened App Store submissions for apps optimized for the iPhone Duo, its first foldable phone. According to Apple Developer News, the device becomes available to customers on October 23, 2026, and developers are directed to recompile existing apps with Xcode 27.1, which adds development support for the device.
What We Know
- Apple’s announcement says developers can submit iPhone Duo optimized apps and games in App Store Connect today.
- Per Apple, Xcode 27.1 includes Device Hub, which lets developers visualize how apps behave on iPhone Duo across all poses and orientations.
- Apple Developer News also describes a new preview tool in App Store Connect that shows how screenshots, product page headers and other metadata look on an iPhone Duo product page.
- Apple’s releases page lists an Xcode 27.1 release candidate (build 27A9275) dated October 5, 2026, following the first Xcode 27.1 beta (build 27A9269) dated September 18, 2026.
- As MacRumors reported, that first beta ran only on Apple silicon Macs with macOS 26.6 or later and included refreshed SDKs for the iPhone Duo plus an updated simulator for the device’s configurations and display orientations. The report places the release just over a week after Apple’s “Surprise and Shine” event, where the iPhone Duo was introduced as Apple’s first foldable smartphone.
Why the SDK Matters
According to MacRumors, existing App Store apps will run on the iPhone Duo automatically. Only apps built with the iOS 27.1 SDK or later, however, can dynamically resize to fill the entire inner display; unoptimized apps will have black borders.
Deadline Ahead
Apple states that starting April 2027, any apps or games submitted will need to include screenshots for iPhone Duo, per Apple Developer News.
What We Don’t Know
The sources reviewed do not describe the contents of the Xcode 27.1 release notes beyond iPhone Duo support, and they do not say when the final, non-candidate Xcode 27.1 build will ship.