The foldable smartphone segment is undergoing an aspect-ratio shift. For years, phone manufacturers debated whether a foldable should look like a standard smartphone when closed or a compact digital notepad.
Recent form factor leaks—including early details surrounding Apple’s upcoming “iPhone Duo”—suggest that Chinese OEMs like Huawei and Xiaomi are converging on a short-and-wide blueprint. Meanwhile, Samsung continues to hold on to a narrower profile for its Galaxy Z Fold line, leaving the Galaxy Z Fold8 looking like an outlier.
Aspect Ratios & Form Factors
Comparing how these foldables sit in the hand reveals two completely different design philosophies.
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| Huawei Pura X Max | Xiaomi 18 Fold | Galaxy Z Fold8 |
| (Passport / Landscape) | (Mid-Fold / Square) | (Tall & Narrow) |
| [ 7.7" Inner ] | [ 7.58" Inner ] | [ 7.6" Inner ] |
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1. Huawei Pura X Max: The Passport Form Factor
Huawei’s Pura X Max features a 7.7-inch inner display and a wide 5.4-inch outer cover screen. Rather than mimicking a conventional tall slab, its aspect ratio resembles a standard passport.
The Advantage: Closed, it feels wide and stable, allowing for a desktop-style typing experience on the cover screen. Unfolded, it switches seamlessly into a wide-canvas tablet layout without requiring a 90-degree device rotation.
2. Xiaomi 18 Fold: The Balanced “Mid-Fold”
Xiaomi’s latest flagship introduces what the company calls a mid-fold layout. Pairing a 5.38-inch cover display with a 7.58-inch primary inner screen, the device adopts display proportions roughly matching standard paper dimensions ($\sqrt{2}:1$).
The Advantage: Unfolding the device yields an expansive viewing area, while the outer panel stays wide enough for full-sized keyboard layouts. At just 5.02mm unfolded, it packs a massive 6,000mAh battery into an ultra-slim chassis.
3. Samsung Galaxy Z Fold8: The Tall & Narrow Outlier
Despite incremental revisions to its outer panel dimensions over successive generations, Samsung’s Galaxy Z Fold8 retains a noticeably taller, narrower profile with its 5.5-inch outer display and 7.6-inch inner display.
The Reality: The Z Fold8 remains taller and narrower side-by-side against both the Pura X Max and Xiaomi 18 Fold. Because Samsung continues to preserve thicker internal display borders for structural reinforcement, its active screen-to-body proportion feels constrained compared to its ultra-thin, edge-to-edge Chinese competitors.
Specifications Comparison
| Feature | Huawei Pura X Max | Xiaomi 18 Fold | Samsung Galaxy Z Fold8 |
| Inner Display | 7.7-inch OLED (120Hz) | 7.58-inch LTPO OLED (120Hz) | 7.6-inch LTPO AMOLED 2X (120Hz) |
| Cover Display | 5.4-inch OLED | 5.38-inch LTPO OLED | 5.5-inch Dynamic AMOLED |
| Unfolded Thickness | 5.2 mm | 5.02 mm | 4.5 mm |
| Weight | 229g | 219g | ~210g–215g |
| Battery & Charging | 5,300 mAh (66W Wired) | 6,000 mAh (67W Wired) | 4,800 mAh (45W Wired) |
| Main Camera | 50 MP (Variable Aperture) | 200 MP Leica Tri-Camera | 50 MP / 200 MP Sensor |
Where Does Apple’s “iPhone Duo” Fit In?
Industry supply chain reports around Apple’s expected foldable—tentatively dubbed the iPhone Duo—indicate Cupertino is leaning toward the shorter, wider form factor popularized by Huawei and Xiaomi rather than Samsung’s narrow approach.
┌────────────────────────────────────────────────────────┐
| FORM FACTOR CONVERGENCE |
├────────────────────────────────────────────────────────┤
| PASSPORT / WIDE DESIGN | TALL / NARROW DESIGN |
| - Huawei Pura X Max | - Samsung Galaxy Z |
| - Xiaomi 18 Fold | Fold8 |
| - Apple iPhone Duo (Leaked) | |
└────────────────────────────────────────────────────────┘
If Apple launches its foldable with a passport-style cover screen, developers will optimize iOS tablet software for wider aspect ratios. That move would leave Samsung’s tall-and-narrow aspect ratio isolated, forcing app developers to build specific layout scaling rules just for Galaxy Fold displays.
The Bottom Line
Samsung still holds structural hardware advantages in hinge durability, IP water-resistance ratings, and global software support. However, its design persistence comes at a cost.
As competitors push thinner frames, narrower bezels, and wider cover screens that mirror standard mobile phones, the Galaxy Z Fold8 feels distinctively narrow in hand. If early iPhone Duo hardware footprints match expectations, the broader smartphone industry may standardize on the shorter, wider design—leaving Samsung to decide whether to adapt or stay the course.
