The compact iPhone Duo has raised questions about how its dimensions measure up against various other iPhone models on the market. Having all current iPhone devices available allows for a direct comparison of the Duo against everything ranging from the iPhone Air to the iPhone 18 Pro Max.
iPhone Duo Specifications and Features
Priced at $1,999, the iPhone Duo is a phone-tablet hybrid featuring a 5.4-inch cover screen and a 7.6-inch inner display suited for multitasking, watching movies, and working on the go. The device measures 5.2 millimeters thick when unfolded and 11.3mm when folded, with a weight of 254 grams.
As a first-generation device, it relies on TouchID instead of FaceID, has limited multitasking capabilities compared to rival foldables, and features scaled-back cameras relative to the iPhone 18 Pro. However, it incorporates a matte texture on the inner display to reduce glare and offers dynamic software integration across both screens.
Comparing the Duo to Other iPhone Models
The $1,299 iPhone 18 Pro Max features a 6.9-inch display, a thickness of 8.75mm, and a weight of 249 grams, making it slightly lighter than the iPhone Duo. Meanwhile, the $1,199 iPhone 18 Pro has a 6.3-inch display, measures 8.75mm thick, and weighs 211 grams.
Apple has not yet released a baseline iPhone 18 model, but the $899 iPhone 17 comes with a 6.3-inch display, a 7.95mm thickness, and a weight of 177 grams. The $1,099 iPhone Air features a 6.5-inch display, a thickness of 5.6mm, and a weight of 165 grams, presenting the most noticeable weight difference when switching to the Duo.
Finally, the $699 iPhone 17E is equipped with a 6.1-inch display, measures 7.8mm thick, and weighs 169 grams.
Readers considering the transition to the iPhone Duo can consult CNET’s in-depth review for further details on operating Apple’s first foldable phone.
