ArticleSeptember 10, 2026
Designing for iPhone Duo
Apple’s first folding iPhone asks teams to keep one adaptive app across poses and two displays, not invent a separate “foldable mode” per hardware state. Size, aspect ratio, and which face is active will keep changing. The design brief is coherence. Start with Apple’s own material: iPhone Duo for developers, HIG: Designing for iPhone Duo, and the tech talks Design for iPhone Duo, Raise the bar, an
IosDesign SystemHuman Interface