Redmi K90 Ultra vs Vivo Y31s 5G
The Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite, while the Vivo Y31s 5G (2026) runs on the Qualcomm Snapdragon 4 Gen 2; launch prices were $420 and $200. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 47/100 (a 26-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 6500); the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 568,395); the Redmi K90 Ultra has NFC for contactless payments, the Vivo Y31s 5G doesn't; the Vivo Y31s 5G is noticeably lighter (207g vs 227g).
Profile comparison
Category scores
Redmi K90 Ultra
Vivo Y31s 5G
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 568395
- Better Geekbench Single: 3013 vs 915
- Better Geekbench Multi: 9287 vs 2115
- Bigger battery: 8550 vs 6500 mAh
- Faster charging: 100W vs 44W
- Higher refresh rate: 165Hz vs 120Hz
- Higher performance (92/100 vs 46/100)
- Longer battery life (78/100 vs 58/100)
- Better display (94/100 vs 55/100)
What makes Vivo Y31s 5G better?
- Lighter: 207g vs 227g
- Cheaper at launch: $200 vs $420
- Better portability (50/100 vs 40/100)
Comparison verdict
Comparing the Redmi K90 Ultra vs the Vivo Y31s 5G, the Redmi K90 Ultra scores 26 points higher (73/100 vs 47/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 46/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 58/100). Value score: Redmi K90 Ultra — 72/100, Vivo Y31s 5G — 54/100; 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 Redmi K90 Ultra significantly outperforms the Vivo Y31s 5G (92/100 vs 46/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the Vivo Y31s 5G (94/100 vs 55/100). In the "camera" category, both devices are on the same level — 37/100. In the "battery" category, the Redmi K90 Ultra notably outperforms the Vivo Y31s 5G (78/100 vs 58/100). In the "portability" category, the Vivo Y31s 5G is a bit better (50/100 vs 40/100).
Specs comparison
| Specification | Redmi K90 Ultra | Vivo Y31s 5G | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Qualcomm Snapdragon 4 Gen 2 | |
| AnTuTu | 3233695 | 568395 | |
| Geekbench Single | 3013 | 915 | |
| Geekbench Multi | 9287 | 2115 | |
| Display | 6.8" AMOLED | 6.7" IPS LCD | |
| Resolution | 1280x2772 | 1600x720 | |
| Refresh rate | 165 Hz | 120 Hz | |
| Battery | 8550 mAh | 6500 mAh | |
| Charging | 100W | 44W | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 8 MP | 0 MP | |
| Front camera | 20 MP | 32 MP | |
| RAM | 12GB / 16GB | 8GB | |
| Storage | 256GB / 512GB | 256GB | |
| OS | Android 16 | Android 16 | |
| Brightness (peak) | 3500 nits | — | |
| NFC | yes | no | |
| Protection | IP68/IP69 | — | |
| Dimensions | 162.9×77.9×8.2 mm | 164.2×75.4×8.4 mm | |
| Weight | 227 g | 207 g | |
| Launch price | $420 | $200 |
Camera comparison
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Vivo Y31s 5G
- Main: 50MP f/1.8
- Front: 32MP
Display comparison
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Vivo Y31s 5G
- 6.7" IPS LCD
- Resolution: 1600x720
- Refresh rate: 120 Hz
Battery and charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Vivo Y31s 5G
- 6500 mAh
- Wired: 44W
- No wireless charging
Overall performance score
We compared Redmi K90 Ultra and Vivo Y31s 5G, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Vivo Y31s 5G by 468.9% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $220. Vivo Y31s 5G was $220 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Vivo Y31s 5G (92/100 vs 46/100).
display
In the "display" category, the Redmi K90 Ultra significantly outperforms the Vivo Y31s 5G (94/100 vs 55/100).
camera
In the "camera" category, both devices are on the same level — 37/100.
battery
In the "battery" category, the Redmi K90 Ultra notably outperforms the Vivo Y31s 5G (78/100 vs 58/100).
portability
In the "portability" category, the Vivo Y31s 5G is a bit better (50/100 vs 40/100).
Frequently asked questions
Which is better: the Redmi K90 Ultra or the Vivo Y31s 5G?
The Redmi K90 Ultra significantly outperforms the Vivo Y31s 5G by 26 points (73/100 vs 47/100).
What is the rating of the Redmi K90 Ultra and the Vivo Y31s 5G?
The Redmi K90 Ultra has a MobileRank rating of 73/100, the Vivo Y31s 5G — 47/100.
Which is more powerful: the Redmi K90 Ultra or the Vivo Y31s 5G?
The Redmi K90 Ultra leads on performance (92/100 vs 46/100).
Should you choose the Redmi K90 Ultra over the Vivo Y31s 5G?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.