Samsung Galaxy Z Fold 4 vs Xiaomi 15 Ultra
The Verdict
Samsung's Z Fold 4 revolutionizes mobile productivity with its innovative foldable design, offering a expansive 7.6-inch inner display and dual-screen versatility at the cost of battery life and charging speed. Xiaomi's 15 Ultra counters with a more conventional but refined experience: superior display brightness (3200 nits vs 1200), significantly faster 90W charging, a colossal 5810mAh battery, and a more advanced camera system featuring a 200MP periscope telephoto. Performance-wise, the Xiaomi leverages the newer Snapdragon 8 Elite chipset with stronger GPU capabilities. However, Samsung's form factor remains genuinely unique,multitasking on the inner display justifies premium pricing for power users. For photography enthusiasts and everyday reliability, Xiaomi delivers exceptional value. Choose the Z Fold 4 if you crave innovative productivity features; select the Xiaomi 15 Ultra for superior battery endurance, charging speed, and camera prowess at nearly half the price.
Who Should Buy
Buy the Samsung Galaxy Z Fold 4 if…
- →Refined hinge is slimmer and lighter than Fold 3
- →Taskbar for PC-like multitasking
- →Improved cameras over Fold 3
Buy the Xiaomi 15 Ultra if…
- →200MP periscope telephoto with 5x optical zoom rivals Galaxy S25 Ultra
- →1-inch main sensor with Leica optics produces stunning photos
- →Titanium frame gives a premium, durable build
Category Scores
Pros & Cons
Samsung Galaxy Z Fold 4
Pros
- Refined hinge is slimmer and lighter than Fold 3
- Taskbar for PC-like multitasking
- Improved cameras over Fold 3
- IPX8 water resistance
- Flex mode for hands-free use
Cons
- Still very expensive at $1799
- Heavy at 263 g
- Visible crease on inner display
- Under-display camera quality is poor
- Slow 25W charging
Xiaomi 15 Ultra
Pros
- 200MP periscope telephoto with 5x optical zoom rivals Galaxy S25 Ultra
- 1-inch main sensor with Leica optics produces stunning photos
- Titanium frame gives a premium, durable build
- 4K@120fps video recording is industry-leading
- 90W fast charging and 50W wireless on a huge 5810 mAh battery
Cons
- Heavy at 229 g and thick at 9.17 mm
- Very expensive at $999 with limited global availability
- HyperOS software experience lags behind iOS and One UI
- Camera bump is extremely large
Full Specifications
| Spec | Samsung Galaxy Z Fold 4 | Xiaomi 15 Ultra |
|---|---|---|
| Software | Android 12L, One UI 4.1.1 | Android 15 (HyperOS 2) |
| Body | ||
| Weight | 263 g | 229 g |
| Material | Armor Aluminum frame, Gorilla Glass Victus+ | Titanium frame, Gorilla Glass Victus 2 |
| IP rating | IPX8 | IP68 |
| Dimensions | 155.1 x 130.1 x 6.3 mm (unfolded) | 161.1 x 75.2 x 9.17 mm |
| Camera | ||
| Main camera | 50 MP, f/1.8, OIS | 50 MP, f/1.63, OIS (1-inch sensor) |
| Front camera | 10 MP (cover), 4 MP under-display (inner) | 32 MP, f/2.0 |
| Video | 8K@24fps, 4K@60fps | 8K@30fps, 4K@120fps |
| Telephoto | 10 MP, f/2.4, 3x optical zoom | 200 MP, f/2.6, 5x periscope optical zoom, OIS |
| Ultrawide | 12 MP, f/2.2 | 50 MP, f/2.0, 128-degree |
| Memory | ||
| RAM | 12 GB | 16 GB |
| Storage options | 256 GB, 512 GB, 1 TB | 256 GB, 512 GB, 1 TB |
| Battery | ||
| Capacity | 4400 mAh | 5810 mAh |
| Charging | 25W wired | 90W wired |
| Wireless charging | 15W wireless | 50W wireless |
| Display | ||
| Size | 7.6 inches (inner), 6.2 inches (cover) | 6.73 inches |
| Type | Dynamic AMOLED 2X, foldable | LTPO AMOLED |
| Resolution | 2176 x 1812 (inner), 2316 x 904 (cover) | 3200 x 1440 |
| Refresh rate | 120Hz (both) | 1-120Hz |
| Brightness (nits) | 1200 | 3200 |
| Processor | ||
| CPU | Octa-core (1x3.19 GHz + 3x2.75 GHz + 4x2.0 GHz) | Octa-core (2x4.32 GHz + 6x3.53 GHz) |
| GPU | Adreno 730 | Adreno 830 |
| Chipset | Qualcomm Snapdragon 8+ Gen 1 | Qualcomm Snapdragon 8 Elite |
| Connectivity | ||
| 5G | ||
| NFC | ||
| USB | USB-C 3.2 | USB-C 3.2 |
| Wi-Fi | Wi-Fi 6E | Wi-Fi 7 |
| Bluetooth | 5.2 | 5.4 |
Related Comparisons
This comparison is based on verified manufacturer specifications covering display, performance, camera, battery, and build quality. Scores are generated by analyzing specs across weighted categories on a 10-point scale. Learn more about our methodology.
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