Redmi K90 Ultra vs Vivo Y31d
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Vivo Y31d (2026) runs on the Qualcomm Snapdragon 6s 4G Gen 2; estimated prices are $420 and $185. By overall MobileRank rating, the Redmi K90 Ultra leads — 61/100 vs 33/100 (a 28-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 7200); the Redmi K90 Ultra is faster in AnTuTu (2,760,000 vs 522,680); the Redmi K90 Ultra has NFC for contactless payments, the Vivo Y31d doesn't.
Redmi K90 Ultra
Vivo Y31d
- Higher AnTuTu: 2760000 vs 522680
- Better Geekbench Single: 3050 vs 489
- Better Geekbench Multi: 9300 vs 1532
- Bigger battery: 8550 vs 7200 mAh
- Faster charging: 100W vs 44W
- Higher refresh rate: 165Hz vs 120Hz
- Higher performance (65/100 vs 0/100)
- Better camera (32/100 vs 24/100)
- Longer battery life (77/100 vs 57/100)
- Lighter: 219g vs 227g
- Cheaper: $185 vs $420
- Better design/ergonomics (26/100 vs 16/100)
- Better value for money (97/100 vs 81/100)
Comparing the Redmi K90 Ultra vs the Vivo Y31d, the Redmi K90 Ultra scores 28 points higher (61/100 vs 33/100). In the "performance" category, the Redmi K90 Ultra leads (65/100 vs 0/100). In the "battery" category, the Redmi K90 Ultra leads (77/100 vs 57/100). In the "value for money" category, the Vivo Y31d leads (97/100 vs 81/100). In the "performance" category, the Redmi K90 Ultra significantly outperforms the Vivo Y31d (65/100 vs 0/100). In the "display" category, both devices are on the same level — 100/100. In the "camera" category, the Redmi K90 Ultra is a bit better (32/100 vs 24/100). In the "battery" category, the Redmi K90 Ultra notably outperforms the Vivo Y31d (77/100 vs 57/100). In the "design" category, the Vivo Y31d is a bit better (26/100 vs 16/100). In the "value for money" category, the Vivo Y31d notably outperforms the Redmi K90 Ultra (97/100 vs 81/100).
| Specification | Redmi K90 Ultra | Vivo Y31d | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 6s 4G Gen 2 | |
| AnTuTu | 2760000 | 522680 | |
| Geekbench Single | 3050 | 489 | |
| Geekbench Multi | 9300 | 1532 | |
| Display | 6.8" AMOLED | 6.8" IPS LCD | |
| Resolution | 1280x2772 | 720x1570 | |
| Refresh rate | 165 Hz | 120 Hz | |
| Battery | 8550 mAh | 7200 mAh | |
| Charging | 100W | 44W | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 8 MP | 0 MP | |
| Front camera | 20 MP | 8 MP | |
| RAM | 12GB / 16GB | 6GB / 8GB | |
| Storage | 256GB / 512GB | 128GB / 256GB | |
| OS | Android 16 | Android 16 | |
| Brightness (peak) | 3500 nits | 1250 nits | |
| NFC | yes | no | |
| Protection | IP68/IP69 | IP68/IP69 | |
| Dimensions | 162.9×77.9×8.2 mm | 166.6×78.4×8.4 mm | |
| Weight | 227 g | 219 g | |
| Price | $420 | $185 |
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Vivo Y31d
- Main: 50MP f/f/2.0
- Front: 8MP
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Vivo Y31d
- 6.8" IPS LCD
- Resolution: 720x1570
- Refresh rate: 120 Hz
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Vivo Y31d
- 7200 mAh
- Wired: 44W
- No wireless charging
We compared Redmi K90 Ultra and Vivo Y31d, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Vivo Y31d by 428.0% in our overall performance rating.
Price difference: $235. Vivo Y31d is cheaper by $235.
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Vivo Y31d (65/100 vs 0/100).
display
In the "display" category, both devices are on the same level — 100/100.
camera
In the "camera" category, the Redmi K90 Ultra is a bit better (32/100 vs 24/100).
battery
In the "battery" category, the Redmi K90 Ultra notably outperforms the Vivo Y31d (77/100 vs 57/100).
design
In the "design" category, the Vivo Y31d is a bit better (26/100 vs 16/100).
value for money
In the "value for money" category, the Vivo Y31d notably outperforms the Redmi K90 Ultra (97/100 vs 81/100).
Which is better: the Redmi K90 Ultra or the Vivo Y31d?
The Redmi K90 Ultra significantly outperforms the Vivo Y31d by 28 points (61/100 vs 33/100).
What is the rating of the Redmi K90 Ultra and the Vivo Y31d?
The Redmi K90 Ultra has a MobileRank rating of 61/100, the Vivo Y31d — 33/100.
Which has the better camera: the Redmi K90 Ultra or the Vivo Y31d?
The Redmi K90 Ultra leads on camera score (32/100 vs 24/100).
Which is more powerful: the Redmi K90 Ultra or the Vivo Y31d?
The Redmi K90 Ultra leads on performance (65/100 vs 0/100).
Should you choose the Redmi K90 Ultra over the Vivo Y31d?
The Redmi K90 Ultra is a better fit for active users, those who care about battery life, budget-conscious buyers. The Vivo Y31d is a better fit for budget-conscious buyers.