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iPhone Duo vs. Xiaomi 18 Fold vs. Huawei Pura X Max: Foldable phone comparison
The iPhone Duo has a 7.6-inch display when unfolded and weighs 254 grams. The similarly sized Xiaomi 18 Fold is 35 grams lighter, while the Huawei Pura X Max has the largest inner display of the three. There are also differences in water resistance, charging and camera zoom.
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Dimensions, displays and weight
| Specification | iPhone Duo | Xiaomi 18 Fold | Huawei Pura X Max |
|---|---|---|---|
| Unfolded dimensions | 164.6 × 117.8 mm | 163.8 × 117.8 mm | 166.5 × 120 mm |
| Inner display | 7.6 inches | 7.58 inches | 7.7 inches |
| Outer display | 5.4 inches | 5.38 inches | 5.4 inches |
| Weight | 254 g | 219 g | 229 g |
All three outer displays have a 120 Hz refresh rate. This makes scrolling look smoother and lets users carry out basic tasks without unfolding the phone. The iPhone Duo's inner display also has a nano-textured anti-reflective layer that helps with readability in bright light.
The Xiaomi is lighter than the iPhone despite having almost the same dimensions and display sizes, which may be noticeable when holding it for longer periods. The Huawei is slightly larger and, at 229 grams, sits between the other two in weight. Its stated thickness is 5.2 mm.
Dust and water resistance
The iPhone Duo has an IP68 rating and stated resistance to immersion at a depth of 6 metres. The Xiaomi 18 Fold is rated IP58 and the Huawei Pura X Max IP59.
The first digit in an IP rating indicates dust protection: 6 means dust-tight, while 5 means protected against dust. The second digit concerns water, but 8 and 9 refer to different kinds of test. IP58 includes protection against immersion under conditions specified by the manufacturer, while IP59 includes protection against high-pressure, high-temperature water jets. An IP59 rating therefore does not automatically imply the same immersion conditions as IP58 or IP68.
Battery and charging
| Specification | iPhone Duo | Xiaomi 18 Fold | Huawei Pura X Max |
|---|---|---|---|
| Battery capacity | Not stated | 6,000 mAh | 5,300 mAh |
| Wired charging | Not stated | 67 W | 66 W |
| Wireless charging | Up to 25 W | 50 W | 50 W |
Xiaomi has the larger of the two stated battery capacities; Huawei comes close in charging power. Apple does not state the iPhone Duo's battery capacity, but claims 31 hours of video playback.
Neither capacity nor maximum charging power alone determines actual battery life or charging time. The video playback figure cannot be directly compared with the competitors' battery capacities without an equivalent test.
Cameras and zoom
The iPhone Duo does not have an optical telephoto lens. At 2× zoom, it uses a crop from the sensor, which may affect the quality of the resulting photo.
The Xiaomi 18 Fold has a 200 MP main sensor and a 50 MP periscope telephoto lens with 3.5× optical zoom. The Huawei Pura X Max combines a 50 MP main sensor with a variable aperture and a telephoto lens with 3.5× optical zoom. The variable aperture allows the camera to change the amount of light entering the lens.
The Xiaomi and Huawei optical telephoto lenses are useful for photographing more distant subjects. Resolution and zoom figures alone, however, are not enough to determine which phone takes the best photos.
Which model makes sense?
The iPhone Duo may appeal to users of the Apple ecosystem and those who value the anti-reflective treatment on its inner display. It is, however, the heaviest of the three and has no optical telephoto lens.
The Xiaomi 18 Fold is the lightest despite its similar dimensions, and it has the largest stated battery and a periscope telephoto lens. The Huawei Pura X Max offers a slightly larger inner display, a variable aperture and optical zoom, while sitting between its competitors in weight.
