Realme X3 vs Xiaomi 15 Ultra
The Realme X3 (2020) runs on the Qualcomm Snapdragon 855+, while the Xiaomi 15 Ultra (2025) runs on the Qualcomm Snapdragon 8 Elite. By overall MobileRank rating, the Xiaomi 15 Ultra leads — 85/100 vs 50/100 (a 35-point difference). Key differences: the Xiaomi 15 Ultra has the bigger battery (6000 mAh vs 4200); the main camera is 64 MP vs 50 MP; the Xiaomi 15 Ultra is faster in AnTuTu (3,030,376 vs 859,084); the Xiaomi 15 Ultra has NFC for contactless payments, the Realme X3 doesn't; the Realme X3 is noticeably lighter (202g vs 225g).
Realme X3
Xiaomi 15 Ultra
- Better main camera: 64MP vs 50MP
- Lighter: 202g vs 225g
- Better portability (48/100 vs 29/100)
- Higher AnTuTu: 3030376 vs 859084
- Better Geekbench Single: 3050 vs 1031
- Better Geekbench Multi: 10200 vs 2864
- Bigger battery: 6000 vs 4200 mAh
- Faster charging: 90W vs 30W
- Higher performance (92/100 vs 55/100)
- Better camera (87/100 vs 48/100)
- Longer battery life (80/100 vs 28/100)
- Better display (90/100 vs 70/100)
Comparing the Realme X3 vs the Xiaomi 15 Ultra, the Xiaomi 15 Ultra scores 35 points higher (85/100 vs 50/100). In the "performance" category, the Xiaomi 15 Ultra leads (92/100 vs 55/100). In the "camera" category, the Xiaomi 15 Ultra leads (87/100 vs 48/100). In the "battery" category, the Xiaomi 15 Ultra leads (80/100 vs 28/100). In the "performance" category, the Xiaomi 15 Ultra significantly outperforms the Realme X3 (92/100 vs 55/100). In the "display" category, the Xiaomi 15 Ultra notably outperforms the Realme X3 (90/100 vs 70/100). In the "camera" category, the Xiaomi 15 Ultra significantly outperforms the Realme X3 (87/100 vs 48/100). In the "battery" category, the Xiaomi 15 Ultra significantly outperforms the Realme X3 (80/100 vs 28/100). In the "portability" category, the Realme X3 notably outperforms the Xiaomi 15 Ultra (48/100 vs 29/100).
| Specification | Realme X3 | Xiaomi 15 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 855+ | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 859084 | 3030376 | |
| Geekbench Single | 1031 | 3050 | |
| Geekbench Multi | 2864 | 10200 | |
| Display | 6.0" IPS LCD | 6.7" LTPO AMOLED | |
| Resolution | 1080x2400 | 3200x1440 | |
| Refresh rate | 120 Hz | 120 Hz | |
| Battery | 4200 mAh | 6000 mAh | |
| Charging | 30W | 90W | |
| Wireless charging | 0W | 50W | |
| DXOMark (camera) | — | 159 | |
| Main camera | 64 MP | 50 MP | |
| Ultrawide | 8 MP | 50 MP | |
| Telephoto | 12 MP | 50 MP | |
| Front camera | 16 MP | 32 MP | |
| RAM | 6GB / 8GB | 16GB | |
| Storage | 128GB | 256GB / 512GB / 1TB | |
| OS | Android 10, Realme UI | Android 15 / HyperOS 2 | |
| Brightness (peak) | — | 3200 nits | |
| NFC | no | yes | |
| Protection | — | IP68 | |
| Dimensions | 163.8×75.8×8.9 mm | 161.3×75.3×9.4 mm | |
| Weight | 202 g | 225 g | |
| Launch price | — | $999 |
Realme X3
- Main: 64MP f/f/1.8
- Ultrawide: 8MP
- Telephoto: 12MP
- Front: 16MP
Xiaomi 15 Ultra
- Main: 50MP f/f/1.63
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Realme X3
- 6.0" IPS LCD
- Resolution: 1080x2400
- Refresh rate: 120 Hz
Xiaomi 15 Ultra
- 6.7" LTPO AMOLED
- Resolution: 3200x1440
- Refresh rate: 120 Hz
Realme X3
- 4200 mAh
- Wired: 30W
- No wireless charging
Xiaomi 15 Ultra
- 6000 mAh
- NanoReview test: web browsing 12:19 hrs, total 30:03 hrs
- Wired: 90W
- Wireless: 50W
We compared Realme X3 and Xiaomi 15 Ultra, covering their specs and all relevant benchmarks.
Xiaomi 15 Ultra leads Realme X3 by 71.7% in our overall performance rating.
Realme X3
Price unknownperformance
In the "performance" category, the Xiaomi 15 Ultra significantly outperforms the Realme X3 (92/100 vs 55/100).
display
In the "display" category, the Xiaomi 15 Ultra notably outperforms the Realme X3 (90/100 vs 70/100).
camera
In the "camera" category, the Xiaomi 15 Ultra significantly outperforms the Realme X3 (87/100 vs 48/100).
battery
In the "battery" category, the Xiaomi 15 Ultra significantly outperforms the Realme X3 (80/100 vs 28/100).
portability
In the "portability" category, the Realme X3 notably outperforms the Xiaomi 15 Ultra (48/100 vs 29/100).
Which is better: the Realme X3 or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra significantly outperforms the Realme X3 by 35 points (85/100 vs 50/100).
What is the rating of the Realme X3 and the Xiaomi 15 Ultra?
The Realme X3 has a MobileRank rating of 50/100, the Xiaomi 15 Ultra — 85/100.
Which has the better camera: the Realme X3 or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra leads on camera score (87/100 vs 48/100).
Which is more powerful: the Realme X3 or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra leads on performance (92/100 vs 55/100).
Should you choose the Realme X3 over the Xiaomi 15 Ultra?
The Realme X3 is a better fit for everyday use. The Xiaomi 15 Ultra is a better fit for gamers and power users, mobile photography enthusiasts, those who care about battery life, budget-conscious buyers.