Fairphone 4 vs Redmi K90 Ultra
The Fairphone 4 (2021) runs on the Snapdragon 750G, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite; estimated prices are $449 and $420. By overall MobileRank rating, the Redmi K90 Ultra leads — 75/100 vs 39/100 (a 36-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 3905); the main camera is 48 MP vs 50 MP; the Redmi K90 Ultra is faster in AnTuTu (3,119,308 vs 517,683); the Redmi K90 Ultra is thinner (8.2mm vs 10.5mm).
Fairphone 4
Redmi K90 Ultra
- Lighter: 225g vs 227g
- Better camera (53/100 vs 37/100)
- Higher AnTuTu: 3119308 vs 517683
- Better Geekbench Single: 3041 vs 601
- Better Geekbench Multi: 9494 vs 1882
- Bigger battery: 8550 vs 3905 mAh
- Faster charging: 100W vs 20W
- Better main camera: 50MP vs 48MP
- Higher refresh rate: 165Hz vs 60Hz
- Cheaper: $420 vs $449
- Higher performance (92/100 vs 40/100)
- Longer battery life (92/100 vs 20/100)
- Better display (94/100 vs 43/100)
- Better portability (40/100 vs 28/100)
- Better value for money (86/100 vs 10/100)
Comparing the Fairphone 4 vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 36 points higher (75/100 vs 39/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 40/100). In the "camera" category, the Fairphone 4 leads (53/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra leads (92/100 vs 20/100). In the "value for money" category, the Redmi K90 Ultra leads (86/100 vs 10/100). In the "performance" category, the Redmi K90 Ultra significantly outperforms the Fairphone 4 (92/100 vs 40/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the Fairphone 4 (94/100 vs 43/100). In the "camera" category, the Fairphone 4 notably outperforms the Redmi K90 Ultra (53/100 vs 37/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the Fairphone 4 (92/100 vs 20/100). In the "portability" category, the Redmi K90 Ultra is a bit better (40/100 vs 28/100). In the "value for money" category, the Redmi K90 Ultra significantly outperforms the Fairphone 4 (86/100 vs 10/100).
| Specification | Fairphone 4 | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | Snapdragon 750G | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 517683 | 3119308 | |
| Geekbench Single | 601 | 3041 | |
| Geekbench Multi | 1882 | 9494 | |
| Display | 6.3" IPS LCD | 6.8" AMOLED | |
| Resolution | 1080x2340 | 1280x2772 | |
| Refresh rate | 60 Hz | 165 Hz | |
| Battery | 3905 mAh | 8550 mAh | |
| Charging | 20W | 100W | |
| Main camera | 48 MP | 50 MP | |
| Ultrawide | 48 MP | 8 MP | |
| Front camera | 25 MP | 20 MP | |
| RAM | 6GB / 8GB | 12GB / 16GB | |
| Storage | 128GB / 256GB | 256GB / 512GB | |
| OS | Android 11 | Android 16 | |
| Brightness (peak) | — | 3500 nits | |
| NFC | yes | yes | |
| Protection | IP54 | IP68/IP69 | |
| Dimensions | 162.0×75.5×10.5 mm | 162.9×77.9×8.2 mm | |
| Weight | 225 g | 227 g | |
| Price | $449 | $420 |
Fairphone 4
- Main: 48MP f/f/1.6
- Ultrawide: 48MP
- Front: 25MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Fairphone 4
- 6.3" IPS LCD
- Resolution: 1080x2340
- Refresh rate: 60 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Fairphone 4
- 3905 mAh
- Wired: 20W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- Wireless charging: no data
We compared Fairphone 4 and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Fairphone 4 by 83.4% in our overall performance rating.
Price difference: $29. Redmi K90 Ultra is cheaper by $29.
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Fairphone 4 (92/100 vs 40/100).
display
In the "display" category, the Redmi K90 Ultra significantly outperforms the Fairphone 4 (94/100 vs 43/100).
camera
In the "camera" category, the Fairphone 4 notably outperforms the Redmi K90 Ultra (53/100 vs 37/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the Fairphone 4 (92/100 vs 20/100).
portability
In the "portability" category, the Redmi K90 Ultra is a bit better (40/100 vs 28/100).
value for money
In the "value for money" category, the Redmi K90 Ultra significantly outperforms the Fairphone 4 (86/100 vs 10/100).
Which is better: the Fairphone 4 or the Redmi K90 Ultra?
The Redmi K90 Ultra significantly outperforms the Fairphone 4 by 36 points (75/100 vs 39/100).
What is the rating of the Fairphone 4 and the Redmi K90 Ultra?
The Fairphone 4 has a MobileRank rating of 39/100, the Redmi K90 Ultra — 75/100.
Which has the better camera: the Fairphone 4 or the Redmi K90 Ultra?
The Fairphone 4 leads on camera score (53/100 vs 37/100).
Which is more powerful: the Fairphone 4 or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 40/100).
Should you choose the Fairphone 4 over the Redmi K90 Ultra?
The Fairphone 4 is a better fit for everyday use. The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers.