iPhone Duo support by framework

Apple ships adaptive APIs for SwiftUI and UIKit. Every cross-platform framework is, as of today, on its own — which is why the guides below separate what Apple has documented from what we have inferred.

See all six compared in one table

• SwiftUI on iPhone Duo

  First-party support

  SwiftUI has first-party iPhone Duo support. ArrangementView, ReservedRegion and the vertical toolbar APIs ship in the iOS 27.1 SDK.

  Read the guide — SwiftUI on iPhone Duo

• UIKit on iPhone Duo

  First-party support

  UIKit has full first-party iPhone Duo support, with UIArrangementViewController, UIViewReservedRegion and vertical bar APIs in the iOS 27.1 SDK.

  Read the guide — UIKit on iPhone Duo

• React Native on iPhone Duo

  No vendor support

  React Native has shipped no iPhone Duo support. Core layout works, but the new adaptive APIs need a native module and several common patterns break.

  Read the guide — React Native on iPhone Duo

• Flutter on iPhone Duo

  Partial / unconfirmed

  Flutter has mature foldable support on Android through MediaQuery.displayFeatures, but nothing equivalent has shipped for iPhone Duo on iOS.

  Read the guide — Flutter on iPhone Duo

• Unity on iPhone Duo

  No vendor support

  Unity games face resolution changes mid-session on iPhone Duo, plus safe-area and pause-behaviour issues that a fixed-resolution game has never handled.

  Read the guide — Unity on iPhone Duo

• Capacitor & web views on iPhone Duo

  No vendor support

  Web-based iOS apps adapt well to iPhone Duo if they use CSS environment variables correctly and treat the viewport as genuinely variable.

  Read the guide — Capacitor & web views on iPhone Duo