Nothing Phone (4b) vs Redmi K90 Ultra
The Nothing Phone (4b) (2026) runs on the Qualcomm Snapdragon 6 Gen 4, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $355 and $420. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 55/100 (a 18-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 5200); the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 975,254); the Nothing Phone (4b) is noticeably lighter (210g vs 227g).
Profile comparison
Category scores
Nothing Phone (4b)
Redmi K90 Ultra
What makes Nothing Phone (4b) better?
- Lighter: 210g vs 227g
- Cheaper at launch: $355 vs $420
- Better portability (47/100 vs 40/100)
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 975254
- Better Geekbench Single: 3013 vs 1087
- Better Geekbench Multi: 9287 vs 3148
- Bigger battery: 8550 vs 5200 mAh
- Faster charging: 100W vs 33W
- Higher refresh rate: 165Hz vs 120Hz
- Higher performance (92/100 vs 58/100)
- Better camera (37/100 vs 35/100)
- Longer battery life (78/100 vs 59/100)
- Better display (94/100 vs 79/100)
Comparison verdict
Comparing the Nothing Phone (4b) vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 18 points higher (73/100 vs 55/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 58/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 59/100). Value score: Nothing Phone (4b) — 42/100, Redmi K90 Ultra — 72/100; 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 Nothing Phone (4b) (92/100 vs 58/100). In the "display" category, the Redmi K90 Ultra notably outperforms the Nothing Phone (4b) (94/100 vs 79/100). In the "camera" category, the Redmi K90 Ultra and the Nothing Phone (4b) are nearly equal (37/100 vs 35/100). In the "battery" category, the Redmi K90 Ultra notably outperforms the Nothing Phone (4b) (78/100 vs 59/100). In the "portability" category, the Nothing Phone (4b) is a bit better (47/100 vs 40/100).
Specs comparison
| Specification | Nothing Phone (4b) | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 6 Gen 4 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 975254 | 3233695 | |
| Geekbench Single | 1087 | 3013 | |
| Geekbench Multi | 3148 | 9287 | |
| Display | 6.8" AMOLED | 6.8" AMOLED | |
| Resolution | 1080x2344 | 1280x2772 | |
| Refresh rate | 120 Hz | 165 Hz | |
| Battery | 5200 mAh | 8550 mAh | |
| Charging | 33W | 100W | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 8 MP | 8 MP | |
| Front camera | 16 MP | 20 MP | |
| RAM | 8GB | 12GB / 16GB | |
| Storage | 128GB / 256GB | 256GB / 512GB | |
| OS | Android 16 | Android 16 | |
| Brightness (peak) | 2000 nits | 3500 nits | |
| NFC | yes | yes | |
| Protection | IP64 | IP68/IP69 | |
| Dimensions | 164.4×78.2×8.6 mm | 162.9×77.9×8.2 mm | |
| Weight | 210 g | 227 g | |
| Launch price | $355 | $420 |
Camera comparison
Nothing Phone (4b)
- Main: 50MP f/1.8
- Ultrawide: 8MP
- Front: 16MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Display comparison
Nothing Phone (4b)
- 6.8" AMOLED
- Resolution: 1080x2344
- Refresh rate: 120 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Battery and charging
Nothing Phone (4b)
- 5200 mAh
- Wired: 33W
- Wireless charging: no data
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Overall performance score
We compared Nothing Phone (4b) and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Nothing Phone (4b) by 69.8% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $65. Nothing Phone (4b) was $65 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Nothing Phone (4b) (92/100 vs 58/100).
display
In the "display" category, the Redmi K90 Ultra notably outperforms the Nothing Phone (4b) (94/100 vs 79/100).
camera
In the "camera" category, the Redmi K90 Ultra and the Nothing Phone (4b) are nearly equal (37/100 vs 35/100).
battery
In the "battery" category, the Redmi K90 Ultra notably outperforms the Nothing Phone (4b) (78/100 vs 59/100).
portability
In the "portability" category, the Nothing Phone (4b) is a bit better (47/100 vs 40/100).
Frequently asked questions
Which is better: the Nothing Phone (4b) or the Redmi K90 Ultra?
The Redmi K90 Ultra is noticeably better than the Nothing Phone (4b) — the overall rating gap is 18 points.
What is the rating of the Nothing Phone (4b) and the Redmi K90 Ultra?
The Nothing Phone (4b) has a MobileRank rating of 55/100, the Redmi K90 Ultra — 73/100.
Which is more powerful: the Nothing Phone (4b) or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 58/100).
Should you choose the Nothing Phone (4b) over the Redmi K90 Ultra?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.