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; launch prices were $449 and $420. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 31/100 (a 42-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 (3,233,695 vs 566,483); the Redmi K90 Ultra is thinner (8.2mm vs 10.5mm).
Profile comparison
Category scores
Fairphone 4
Redmi K90 Ultra
What makes Fairphone 4 better?
- Lighter: 225g vs 227g
- Overall rating 31/100
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 566483
- Better Geekbench Single: 3013 vs 601
- Better Geekbench Multi: 9287 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 at launch: $420 vs $449
- Higher performance (92/100 vs 41/100)
- Better camera (37/100 vs 18/100)
- Longer battery life (78/100 vs 20/100)
- Better display (94/100 vs 43/100)
- Better portability (40/100 vs 28/100)
Comparison verdict
Comparing the Fairphone 4 vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 42 points higher (73/100 vs 31/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 41/100). In the "camera" category, the Redmi K90 Ultra leads (37/100 vs 18/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 20/100). Value score: Fairphone 4 — 0/100, 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 Fairphone 4 (92/100 vs 41/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the Fairphone 4 (94/100 vs 43/100). In the "camera" category, the Redmi K90 Ultra notably outperforms the Fairphone 4 (37/100 vs 18/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the Fairphone 4 (78/100 vs 20/100). In the "portability" category, the Redmi K90 Ultra is a bit better (40/100 vs 28/100).
Specs comparison
| Specification | Fairphone 4 | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | Snapdragon 750G | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 566483 | 3233695 | |
| Geekbench Single | 601 | 3013 | |
| Geekbench Multi | 1882 | 9287 | |
| 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 | |
| DXOMark (camera) | 69 | — | |
| 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 | |
| Launch price | $449 | $420 |
Camera comparison
Fairphone 4
- Main: 48MP f/1.6
- Ultrawide: 48MP
- Front: 25MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Display comparison
Fairphone 4
- 6.3" IPS LCD
- Resolution: 1080x2340
- Refresh rate: 60 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Battery and charging
Fairphone 4
- 3905 mAh
- Wired: 20W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Overall performance score
We compared Fairphone 4 and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Fairphone 4 by 82.5% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $29. Redmi K90 Ultra was $29 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Fairphone 4 (92/100 vs 41/100).
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 Redmi K90 Ultra notably outperforms the Fairphone 4 (37/100 vs 18/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the Fairphone 4 (78/100 vs 20/100).
portability
In the "portability" category, the Redmi K90 Ultra is a bit better (40/100 vs 28/100).
Frequently asked questions
Which is better: the Fairphone 4 or the Redmi K90 Ultra?
The Redmi K90 Ultra significantly outperforms the Fairphone 4 by 42 points (73/100 vs 31/100).
What is the rating of the Fairphone 4 and the Redmi K90 Ultra?
The Fairphone 4 has a MobileRank rating of 31/100, the Redmi K90 Ultra — 73/100.
Which has the better camera: the Fairphone 4 or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on camera score (37/100 vs 18/100).
Which is more powerful: the Fairphone 4 or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 41/100).
Should you choose the Fairphone 4 over the Redmi K90 Ultra?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.