A key technical detail is the absence of Face ID; the Duo instead utilizes a Touch ID sensor built into the side power button for authentication, marking a departure from Apple's high-end biometric standards.
The shift in dimensions is significant because it allows the inner matte-textured display to avoid the square aspect ratio common in competing foldables, which the source suggests often results in poor software scaling.
To support this new hardware, Apple has redesigned the user interface (UI) with a "right-side bias," placing toolbars and the app dock permanently on the right side of the screen to mimic the ergonomics of holding a book.
This integration of hardware and software aims to create a more natural experience for a foldable form factor, though it requires users to adapt to a different navigational layout than existing iPhones.
Available for pre-order on October 16 starting at $2,000, the Duo is positioned as a premium alternative to the newly announced iPhone 18 Pro series.
While it shares the powerful A20 Pro chip, it lacks some of the Pro line's advanced camera features like variable aperture and pro-grade video recording.
The device is aimed at users seeking a "personal hub" that functions as both a phone and a small tablet, though its success may depend on how consumers balance using the squat outer screen against the expansive 7.8-inch inner display.