Redmi K90 Ultra vs Vivo S21 Pro
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Vivo S21 Pro (2024) runs on the MediaTek Dimensity 9300+. By overall MobileRank rating, the Vivo S21 Pro leads — 79/100 vs 73/100 (a 6-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 5500); the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 2,348,248).
Profile comparison
Category scores
Redmi K90 Ultra
Vivo S21 Pro
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 2348248
- Better Geekbench Single: 3013 vs 2249
- Better Geekbench Multi: 9287 vs 7352
- Bigger battery: 8550 vs 5500 mAh
- Faster charging: 100W vs 90W
- Higher refresh rate: 165Hz vs 120Hz
- Higher performance (92/100 vs 83/100)
- Longer battery life (78/100 vs 64/100)
- Better display (94/100 vs 85/100)
What makes Vivo S21 Pro better?
- Better camera (81/100 vs 37/100)
Comparison verdict
Comparing the Redmi K90 Ultra vs the Vivo S21 Pro, the Vivo S21 Pro scores 6 points higher (79/100 vs 73/100). In the "camera" category, the Vivo S21 Pro leads (81/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 64/100). In the "performance" category, the Redmi K90 Ultra is a bit better (92/100 vs 83/100). In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 85/100). In the "camera" category, the Vivo S21 Pro significantly outperforms the Redmi K90 Ultra (81/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra is a bit better (78/100 vs 64/100).
Specs comparison
| Specification | Redmi K90 Ultra | Vivo S21 Pro | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | MediaTek Dimensity 9300+ | |
| AnTuTu | 3233695 | 2348248 | |
| Geekbench Single | 3013 | 2249 | |
| Geekbench Multi | 9287 | 7352 | |
| Display | 6.8" AMOLED | 6.7" AMOLED | |
| Resolution | 1280x2772 | 1260x2800 | |
| Refresh rate | 165 Hz | 120 Hz | |
| Battery | 8550 mAh | 5500 mAh | |
| Charging | 100W | 90W | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 8 MP | 50 MP | |
| Telephoto | 0 MP | 50 MP | |
| Front camera | 20 MP | 50 MP | |
| RAM | 12GB / 16GB | 16GB | |
| Storage | 256GB / 512GB | 512GB | |
| OS | Android 16 | Android 15, OriginOS 5 | |
| Brightness (peak) | 3500 nits | — | |
| NFC | yes | yes | |
| Protection | IP68/IP69 | IP68 | |
| Dimensions | 162.9×77.9×8.2 mm | — | |
| Weight | 227 g | — | |
| Launch price | $420 | — |
Camera comparison
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Vivo S21 Pro
- Main: 50MP f/1.9
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 50MP
Display comparison
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Vivo S21 Pro
- 6.7" AMOLED
- Resolution: 1260x2800
- Refresh rate: 120 Hz
Battery and charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Vivo S21 Pro
- 5500 mAh
- Wired: 90W
- No wireless charging
Overall performance score
We compared Redmi K90 Ultra and Vivo S21 Pro, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Vivo S21 Pro by 37.7% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Vivo S21 Pro
Price unknownDetailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra is a bit better (92/100 vs 83/100).
display
In the "display" category, the Redmi K90 Ultra is a bit better (94/100 vs 85/100).
camera
In the "camera" category, the Vivo S21 Pro significantly outperforms the Redmi K90 Ultra (81/100 vs 37/100).
battery
In the "battery" category, the Redmi K90 Ultra is a bit better (78/100 vs 64/100).
Frequently asked questions
Which is better: the Redmi K90 Ultra or the Vivo S21 Pro?
The Vivo S21 Pro edges out the Redmi K90 Ultra by just 6 points — the two devices are very close in overall level.
What is the rating of the Redmi K90 Ultra and the Vivo S21 Pro?
The Redmi K90 Ultra has a MobileRank rating of 73/100, the Vivo S21 Pro — 79/100.
Which has the better camera: the Redmi K90 Ultra or the Vivo S21 Pro?
The Vivo S21 Pro leads on camera score (81/100 vs 37/100).
Which is more powerful: the Redmi K90 Ultra or the Vivo S21 Pro?
The Redmi K90 Ultra leads on performance (92/100 vs 83/100).
Should you choose the Redmi K90 Ultra over the Vivo S21 Pro?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life. The Vivo S21 Pro is a better fit for gamers and power users, mobile photography enthusiasts.