Apple Tells Developers to Adapt Apps for Foldable iPhone Duo or Face App Store Rejection

On October 23, 2026, Apple’s first foldable smartphone, the iPhone Duo, will hit store shelves. To avoid the main problem with flexible Android devices, where third-party apps looked like stretched mobile windows with black bars for years, the company decided to act ahead of time. In an announcement on the Apple Developer portal, developers were warned: starting in April 2027, the App Store will stop accepting any new apps and updates without a set of screenshots for both displays of the new device.

The gradual transition is already underway — studios can upload optimized versions of their software through the App Store Connect console, but next spring this requirement will become a mandatory condition for passing moderation.

Two Screens and Strict Graphics Standards

The device’s form factor forced engineers to rethink the usual requirements for interface rendering. According to the official specifications of the smartphone, when closed, the user interacts with a compact 5.4-inch external display, and when unfolded gets a 7.6-inch tablet-sized diagonal. Apps must adapt smoothly not only to the sharp change in area, but also to intermediate hinge positions when the phone is used in stand mode.

To test this scenario, the Xcode 27.1 development environment was released with a built-in foldable simulator. The App Store Connect technical documentation already specifies strict resolutions for promotional materials:

• the compact screen requires images in 1398 × 2034 pixels;
• the large foldable display requires 2007 × 2853 pixels in portrait orientation (options for landscape mode are also provided).

Failing to upload at least one of these sets will make publication impossible.

Who Will Have to Rewrite Their Interface

Apple’s policy looks strict, but the company has tried to minimize developers’ costs. The official design guidelines emphasize that apps built on modern SwiftUI libraries with adaptive layouts will adjust to the new screen almost automatically without manually rewriting code.

The main burden will fall on mobile games with custom engines, apps with fixed element coordinates, and programs with complex full-screen interfaces (such as video editors and drafting tools).

By giving the market a six-month buffer before the ban takes effect, Apple is safeguarding the launch of its flagship: by the time the iPhone Duo reaches the mass buyer, the App Store storefront will already be filled with software guaranteed to work without bugs on both screens.