The central trade-off in book-style foldables is aspect ratio: a tall, narrow phone folds open into an equally tall, narrow panel, and neither state serves the content people actually use. The industry has been shortening and widening the handset toward a squatter proportion, and Xiaomi's 18 Fold, shown behind closed doors at IFA, takes that further than Samsung's Galaxy Z Fold 8 by going both shorter and wider on both display surfaces.
The 18 Fold lands at roughly a 1.4:1 aspect ratio on both its 7.58-inch inner display and its 5.38-inch outer screen. Those numbers put it at the squatter end of the current foldable generation. The device is Xiaomi's first book-style foldable since the Mix Fold 4 in 2024. In the time since, both Huawei and Samsung shifted to the short, wide geometry that the 18 Fold now joins and extends.
Where the 1.4:1 ratio changes the experience
A near-square inner panel sits closer to a standard tablet's content geometry. Split-screen layouts and widescreen video fill the display without the vertical compression that defined the first wave of book foldables, where taller inner screens made the open state feel more like two phones stitched together than a tablet replacement. The 5.38-inch cover screen benefits from the same proportion: at 1.4:1, it reads as a conventional phone face rather than a narrow strip.
A closed-door showing at IFA placed the 18 Fold's specifications above the Galaxy Z Fold 8, with the device described as the phone the Galaxy line should have been. Hardware specifics from that session were not detailed. The overall look and feel, by contrast, was described as similar to Samsung's device, which gives Xiaomi a comparable baseline experience with a reported specification advantage layered on top.
Xiaomi timed the reveal to the same week Apple is expected to enter the wide-foldable segment with its own device. That convergence puts three of the major players on the same squat form factor at nearly the same moment, compressing what might have been a multi-year format drift into a single season.
The 18 Fold marks Xiaomi's return to the book-style format after a gap since the Mix Fold 4. On current evidence, the device matches the Samsung reference design in feel, exceeds it on reported specs, and pushes the 1.4:1 geometry further than its current competitors. The 7.58-inch inner panel is the specific surface where buyers will test that claim.