Realme C100 5G vs Redmi K90 Ultra
The Realme C100 5G (2026) runs on the Dimensity 6300, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $210 and $420. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 45/100 (a 28-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 7000); the Redmi K90 Ultra is faster in AnTuTu (3,119,308 vs 524,785); the Redmi K90 Ultra has NFC for contactless payments, the Realme C100 5G doesn't.
Realme C100 5G
Redmi K90 Ultra
- Lighter: 224g vs 227g
- Cheaper at launch: $210 vs $420
- Overall rating 45/100
- Higher AnTuTu: 3119308 vs 524785
- Better Geekbench Single: 3041 vs 771
- Better Geekbench Multi: 9494 vs 1980
- Bigger battery: 8550 vs 7000 mAh
- Faster charging: 100W vs 45W
- Higher refresh rate: 165Hz vs 144Hz
- Higher performance (92/100 vs 43/100)
- Better camera (37/100 vs 30/100)
- Longer battery life (78/100 vs 60/100)
- Better display (94/100 vs 65/100)
- Better portability (40/100 vs 36/100)
- Higher value score: 82/100 vs 50/100
Comparing the Realme C100 5G vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 28 points higher (73/100 vs 45/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 43/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 60/100). In the "value for money" category, the Redmi K90 Ultra leads (82/100 vs 50/100). In the "performance" category, the Redmi K90 Ultra significantly outperforms the Realme C100 5G (92/100 vs 43/100). In the "display" category, the Redmi K90 Ultra notably outperforms the Realme C100 5G (94/100 vs 65/100). In the "camera" category, the Redmi K90 Ultra is a bit better (37/100 vs 30/100). In the "battery" category, the Redmi K90 Ultra notably outperforms the Realme C100 5G (78/100 vs 60/100). In the "portability" category, the Redmi K90 Ultra and the Realme C100 5G are nearly equal (40/100 vs 36/100). In the "value for money" category, the Redmi K90 Ultra significantly outperforms the Realme C100 5G (82/100 vs 50/100).
| Specification | Realme C100 5G | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | Dimensity 6300 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 524785 | 3119308 | |
| Geekbench Single | 771 | 3041 | |
| Geekbench Multi | 1980 | 9494 | |
| Display | 6.8" IPS LCD | 6.8" AMOLED | |
| Resolution | 720x1570 | 1280x2772 | |
| Refresh rate | 144 Hz | 165 Hz | |
| Battery | 7000 mAh | 8550 mAh | |
| Charging | 45W | 100W | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 0 MP | 8 MP | |
| Front camera | 5 MP | 20 MP | |
| RAM | 4GB / 6GB | 12GB / 16GB | |
| Storage | 128GB / 256GB | 256GB / 512GB | |
| OS | Android 16 / realme UI 7.0 | Android 16 | |
| Brightness (peak) | 900 nits | 3500 nits | |
| NFC | no | yes | |
| Protection | IP64 | IP68/IP69 | |
| Dimensions | 166.8×78.2×8.9 mm | 162.9×77.9×8.2 mm | |
| Weight | 224 g | 227 g | |
| Launch price | $210 | $420 |
Realme C100 5G
- Main: 50MP f/f/1.8
- Front: 5MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Realme C100 5G
- 6.8" IPS LCD
- Resolution: 720x1570
- Refresh rate: 144 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Realme C100 5G
- 7000 mAh
- Wired: 45W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
We compared Realme C100 5G and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Realme C100 5G by 83.2% in our overall performance rating.
Launch price difference: $210. Realme C100 5G was $210 cheaper at launch.
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Realme C100 5G (92/100 vs 43/100).
display
In the "display" category, the Redmi K90 Ultra notably outperforms the Realme C100 5G (94/100 vs 65/100).
camera
In the "camera" category, the Redmi K90 Ultra is a bit better (37/100 vs 30/100).
battery
In the "battery" category, the Redmi K90 Ultra notably outperforms the Realme C100 5G (78/100 vs 60/100).
portability
In the "portability" category, the Redmi K90 Ultra and the Realme C100 5G are nearly equal (40/100 vs 36/100).
value for money
In the "value for money" category, the Redmi K90 Ultra significantly outperforms the Realme C100 5G (82/100 vs 50/100).
Which is better: the Realme C100 5G or the Redmi K90 Ultra?
The Redmi K90 Ultra significantly outperforms the Realme C100 5G by 28 points (73/100 vs 45/100).
What is the rating of the Realme C100 5G and the Redmi K90 Ultra?
The Realme C100 5G has a MobileRank rating of 45/100, the Redmi K90 Ultra — 73/100.
Which has the better camera: the Realme C100 5G or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on camera score (37/100 vs 30/100).
Which is more powerful: the Realme C100 5G or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 43/100).
Should you choose the Realme C100 5G over the Redmi K90 Ultra?
The Realme C100 5G 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.