Samsung Galaxy S21 Ultra vs Xiaomi 18 Fold
The Samsung Galaxy S21 Ultra (2021) runs on the Samsung Exynos 2100, while the Xiaomi 18 Fold (2026) runs on the Xiaomi XRING O3; launch prices were $1199 and $1639. By overall MobileRank rating, the Xiaomi 18 Fold leads — 86/100 vs 61/100 (a 25-point difference). Key differences: the Xiaomi 18 Fold has the bigger battery (6000 mAh vs 5000); the main camera is 108 MP vs 200 MP; the Xiaomi 18 Fold is faster in AnTuTu (5,228,014 vs 1,074,182); the Xiaomi 18 Fold is thinner (5.0mm vs 8.9mm).
Profile comparison
Category scores
Samsung Galaxy S21 Ultra
Xiaomi 18 Fold
What makes Samsung Galaxy S21 Ultra better?
- Cheaper at launch: $1199 vs $1639
- Better display (89/100 vs 79/100)
What makes Xiaomi 18 Fold better?
- Higher AnTuTu: 5228014 vs 1074182
- Better Geekbench Single: 3715 vs 1435
- Better Geekbench Multi: 14213 vs 3555
- Bigger battery: 6000 vs 5000 mAh
- Faster charging: 67W vs 25W
- Better main camera: 200MP vs 108MP
- Faster wireless charging: 50W vs 15W
- Lighter: 219g vs 228g
- Higher performance (99/100 vs 63/100)
- Better camera (85/100 vs 55/100)
- Longer battery life (75/100 vs 52/100)
- Better portability (64/100 vs 33/100)
Comparison verdict
Comparing the Samsung Galaxy S21 Ultra vs the Xiaomi 18 Fold, the Xiaomi 18 Fold scores 25 points higher (86/100 vs 61/100). In the "performance" category, the Xiaomi 18 Fold leads (99/100 vs 63/100). In the "camera" category, the Xiaomi 18 Fold leads (85/100 vs 55/100). In the "battery" category, the Xiaomi 18 Fold leads (75/100 vs 52/100). Value score: Samsung Galaxy S21 Ultra — 32/100, Xiaomi 18 Fold — 80/100; it shows how far a model sits above or below the usual level for its price, and is not part of the overall rating. In the "performance" category, the Xiaomi 18 Fold significantly outperforms the Samsung Galaxy S21 Ultra (99/100 vs 63/100). In the "display" category, the Samsung Galaxy S21 Ultra is a bit better (89/100 vs 79/100). In the "camera" category, the Xiaomi 18 Fold significantly outperforms the Samsung Galaxy S21 Ultra (85/100 vs 55/100). In the "battery" category, the Xiaomi 18 Fold notably outperforms the Samsung Galaxy S21 Ultra (75/100 vs 52/100). In the "portability" category, the Xiaomi 18 Fold significantly outperforms the Samsung Galaxy S21 Ultra (64/100 vs 33/100).
Specs comparison
| Specification | Samsung Galaxy S21 Ultra | Xiaomi 18 Fold | |
|---|---|---|---|
| Processor | Samsung Exynos 2100 | Xiaomi XRING O3 | |
| AnTuTu | 1074182 | 5228014 | |
| Geekbench Single | 1435 | 3715 | |
| Geekbench Multi | 3555 | 14213 | |
| Display | 6.8" AMOLED | 7.6" LTPO AMOLED | |
| Resolution | 3200x1440 | 1672x2364 | |
| Refresh rate | 120 Hz | 120 Hz | |
| Battery | 5000 mAh | 6000 mAh | |
| Charging | 25W | 67W | |
| Wireless charging | 15W | 50W | |
| DXOMark (camera) | 117 | — | |
| Main camera | 108 MP | 200 MP | |
| Ultrawide | 12 MP | 50 MP | |
| Telephoto | 10 MP | 50 MP | |
| Front camera | 40 MP | 16 MP | |
| RAM | 12GB / 16GB | 12GB / 16GB | |
| Storage | 128GB / 256GB / 512GB | 256GB / 512GB / 1TB | |
| OS | Android 11 | Android 16 | |
| Brightness (peak) | 1500 nits | 4000 nits | |
| NFC | yes | yes | |
| Protection | IP68 | IP59 | |
| Dimensions | 165.1×75.6×8.9 mm | 159.7×145.1×5.0 mm | |
| Weight | 228 g | 219 g | |
| Launch price | $1199 | $1639 |
Camera comparison
Samsung Galaxy S21 Ultra
- Main: 108MP f/1.8
- Ultrawide: 12MP
- Telephoto: 10MP
- Front: 40MP
Xiaomi 18 Fold
- Main: 200MP f/1.7
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 16MP
Display comparison
Samsung Galaxy S21 Ultra
- 6.8" AMOLED
- Resolution: 3200x1440
- Refresh rate: 120 Hz
Xiaomi 18 Fold
- 7.6" LTPO AMOLED
- Resolution: 1672x2364
- Refresh rate: 120 Hz
Battery and charging
Samsung Galaxy S21 Ultra
- 5000 mAh
- Wired: 25W
- Wireless: 15W
Xiaomi 18 Fold
- 6000 mAh
- Wired: 67W
- Wireless: 50W
Overall performance score
We compared Samsung Galaxy S21 Ultra and Xiaomi 18 Fold, covering their specs and all relevant benchmarks.
Xiaomi 18 Fold leads Samsung Galaxy S21 Ultra by 79.5% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $440. Samsung Galaxy S21 Ultra was $440 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Xiaomi 18 Fold significantly outperforms the Samsung Galaxy S21 Ultra (99/100 vs 63/100).
display
In the "display" category, the Samsung Galaxy S21 Ultra is a bit better (89/100 vs 79/100).
camera
In the "camera" category, the Xiaomi 18 Fold significantly outperforms the Samsung Galaxy S21 Ultra (85/100 vs 55/100).
battery
In the "battery" category, the Xiaomi 18 Fold notably outperforms the Samsung Galaxy S21 Ultra (75/100 vs 52/100).
portability
In the "portability" category, the Xiaomi 18 Fold significantly outperforms the Samsung Galaxy S21 Ultra (64/100 vs 33/100).
Frequently asked questions
Which is better: the Samsung Galaxy S21 Ultra or the Xiaomi 18 Fold?
The Xiaomi 18 Fold significantly outperforms the Samsung Galaxy S21 Ultra by 25 points (86/100 vs 61/100).
What is the rating of the Samsung Galaxy S21 Ultra and the Xiaomi 18 Fold?
The Samsung Galaxy S21 Ultra has a MobileRank rating of 61/100, the Xiaomi 18 Fold — 86/100.
Which has the better camera: the Samsung Galaxy S21 Ultra or the Xiaomi 18 Fold?
The Xiaomi 18 Fold leads on camera score (85/100 vs 55/100).
Which is more powerful: the Samsung Galaxy S21 Ultra or the Xiaomi 18 Fold?
The Xiaomi 18 Fold leads on performance (99/100 vs 63/100).
Should you choose the Samsung Galaxy S21 Ultra over the Xiaomi 18 Fold?
The Samsung Galaxy S21 Ultra is a better fit for active users. The Xiaomi 18 Fold is a better fit for gamers and power users, mobile photography enthusiasts, those who care about battery life, budget-conscious buyers.