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 (3,233,695 vs 528,398); the Redmi K90 Ultra has NFC for contactless payments, the Realme C100 5G doesn't.
Profile comparison
Category scores
Realme C100 5G
Redmi K90 Ultra
What makes Realme C100 5G better?
- Lighter: 224g vs 227g
- Cheaper at launch: $210 vs $420
- Overall rating 45/100
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 528398
- Better Geekbench Single: 3013 vs 771
- Better Geekbench Multi: 9287 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)
Comparison verdict
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). Value score: Realme C100 5G — 48/100, 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 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).
Specs comparison
| Specification | Realme C100 5G | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | Dimensity 6300 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 528398 | 3233695 | |
| Geekbench Single | 771 | 3013 | |
| Geekbench Multi | 1980 | 9287 | |
| 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 |
Camera comparison
Realme C100 5G
- Main: 50MP f/1.8
- Front: 5MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Display comparison
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
Battery and charging
Realme C100 5G
- 7000 mAh
- Wired: 45W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Overall performance score
We compared Realme C100 5G and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Realme C100 5G by 83.7% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $210. Realme C100 5G was $210 cheaper at launch.
Detailed category analysis
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).
Frequently asked questions
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 Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.