Redmi 4X vs Vivo iQOO 15 Ultra
The Redmi 4X (2017) runs on the Qualcomm Snapdragon 435, while the Vivo iQOO 15 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite Gen 5; launch prices were $120 and $799. By overall MobileRank rating, the Vivo iQOO 15 Ultra leads — 89/100 vs 20/100 (a 69-point difference). Key differences: the Vivo iQOO 15 Ultra has the bigger battery (7400 mAh vs 4100); the main camera is 13 MP vs 50 MP; the Vivo iQOO 15 Ultra is faster in AnTuTu (4,602,290 vs 150,628); the Vivo iQOO 15 Ultra has NFC for contactless payments, the Redmi 4X doesn't; the Redmi 4X is noticeably lighter (150g vs 227g).
Redmi 4X
Vivo iQOO 15 Ultra
- Lighter: 150g vs 227g
- Cheaper at launch: $120 vs $799
- Better portability (76/100 vs 35/100)
- Higher AnTuTu: 4602290 vs 150628
- Better Geekbench Single: 3640 vs 141
- Better Geekbench Multi: 11033 vs 618
- Bigger battery: 7400 vs 4100 mAh
- Better main camera: 50MP vs 13MP
- Higher refresh rate: 144Hz vs 60Hz
- Higher performance (99/100 vs 8/100)
- Better camera (78/100 vs 10/100)
- Longer battery life (92/100 vs 35/100)
- Better display (99/100 vs 32/100)
Comparing the Redmi 4X vs the Vivo iQOO 15 Ultra, the Vivo iQOO 15 Ultra scores 69 points higher (89/100 vs 20/100). In the "performance" category, the Vivo iQOO 15 Ultra leads (99/100 vs 8/100). In the "camera" category, the Vivo iQOO 15 Ultra leads (78/100 vs 10/100). In the "battery" category, the Vivo iQOO 15 Ultra leads (92/100 vs 35/100). Value score: Redmi 4X — 22/100, Vivo iQOO 15 Ultra — 90/100; it is biased by price level, so it should not be compared directly between devices at different prices. In the "performance" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi 4X (99/100 vs 8/100). In the "display" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi 4X (99/100 vs 32/100). In the "camera" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi 4X (78/100 vs 10/100). In the "battery" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi 4X (92/100 vs 35/100). In the "portability" category, the Redmi 4X significantly outperforms the Vivo iQOO 15 Ultra (76/100 vs 35/100).
| Specification | Redmi 4X | Vivo iQOO 15 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 435 | Qualcomm Snapdragon 8 Elite Gen 5 | |
| AnTuTu | 150628 | 4602290 | |
| Geekbench Single | 141 | 3640 | |
| Geekbench Multi | 618 | 11033 | |
| Display | 5.0" IPS LCD | 6.8" LTPO AMOLED | |
| Resolution | — | 1440x3168 | |
| Refresh rate | 60 Hz | 144 Hz | |
| Battery | 4100 mAh | 7400 mAh | |
| Charging | — | 120W | |
| Wireless charging | — | 50W | |
| Main camera | 13 MP | 50 MP | |
| Ultrawide | 0 MP | 50 MP | |
| Telephoto | 0 MP | 50 MP | |
| Front camera | 5 MP | 32 MP | |
| RAM | 2GB / 3GB | 12GB / 16GB / 24GB | |
| Storage | 16GB / 32GB | 256GB / 512GB / 1TB | |
| OS | — | Android 16 | |
| Brightness (peak) | — | 8000 nits | |
| NFC | no | yes | |
| Protection | — | IP68 | |
| Dimensions | 139.2×70.0×8.7 mm | 163.7×76.8×8.7 mm | |
| Weight | 150 g | 227 g | |
| Launch price | $120 | $799 |
Redmi 4X
- Main: 13MP
- Front: 5MP
Vivo iQOO 15 Ultra
- Main: 50MP f/f/1.9
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Redmi 4X
- 5.0" IPS LCD
- Refresh rate: 60 Hz
Vivo iQOO 15 Ultra
- 6.8" LTPO AMOLED
- Resolution: 1440x3168
- Refresh rate: 144 Hz
Redmi 4X
- 4100 mAh
- Wireless charging: no data
Vivo iQOO 15 Ultra
- 7400 mAh
- Wired: 120W
- Wireless: 50W
We compared Redmi 4X and Vivo iQOO 15 Ultra, covering their specs and all relevant benchmarks.
Vivo iQOO 15 Ultra leads Redmi 4X by 96.7% in our overall performance rating.
Launch price difference: $679. Redmi 4X was $679 cheaper at launch.
performance
In the "performance" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi 4X (99/100 vs 8/100).
display
In the "display" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi 4X (99/100 vs 32/100).
camera
In the "camera" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi 4X (78/100 vs 10/100).
battery
In the "battery" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi 4X (92/100 vs 35/100).
portability
In the "portability" category, the Redmi 4X significantly outperforms the Vivo iQOO 15 Ultra (76/100 vs 35/100).
Which is better: the Redmi 4X or the Vivo iQOO 15 Ultra?
The Vivo iQOO 15 Ultra significantly outperforms the Redmi 4X by 69 points (89/100 vs 20/100).
What is the rating of the Redmi 4X and the Vivo iQOO 15 Ultra?
The Redmi 4X has a MobileRank rating of 20/100, the Vivo iQOO 15 Ultra — 89/100.
Which has the better camera: the Redmi 4X or the Vivo iQOO 15 Ultra?
The Vivo iQOO 15 Ultra leads on camera score (78/100 vs 10/100).
Which is more powerful: the Redmi 4X or the Vivo iQOO 15 Ultra?
The Vivo iQOO 15 Ultra leads on performance (99/100 vs 8/100).
Should you choose the Redmi 4X over the Vivo iQOO 15 Ultra?
The Redmi 4X is a better fit for everyday use. The Vivo iQOO 15 Ultra is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers.