Realme 15x vs Vivo X300 Ultra
The Realme 15x (2025) runs on the MediaTek Dimensity 6300, while the Vivo X300 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite Gen 5; launch prices were $250 and $950. By overall MobileRank rating, the Vivo X300 Ultra leads — 91/100 vs 51/100 (a 40-point difference). Key differences: the main camera is 50 MP vs 200 MP; the Vivo X300 Ultra is faster in AnTuTu (4,247,433 vs 528,398); the Vivo X300 Ultra has NFC for contactless payments, the Realme 15x doesn't; the Realme 15x is noticeably lighter (212g vs 230g).
Profile comparison
Category scores
Realme 15x
Vivo X300 Ultra
What makes Realme 15x better?
- Higher refresh rate: 144Hz vs 120Hz
- Lighter: 212g vs 230g
- Cheaper at launch: $250 vs $950
- Better portability (49/100 vs 39/100)
What makes Vivo X300 Ultra better?
- Higher AnTuTu: 4247433 vs 528398
- Better Geekbench Single: 3639 vs 771
- Better Geekbench Multi: 11047 vs 1980
- Faster charging: 100W vs 60W
- Better main camera: 200MP vs 50MP
- Higher performance (99/100 vs 43/100)
- Better camera (96/100 vs 40/100)
- Longer battery life (85/100 vs 75/100)
- Better display (89/100 vs 65/100)
Comparison verdict
Comparing the Realme 15x vs the Vivo X300 Ultra, the Vivo X300 Ultra scores 40 points higher (91/100 vs 51/100). In the "performance" category, the Vivo X300 Ultra leads (99/100 vs 43/100). In the "camera" category, the Vivo X300 Ultra leads (96/100 vs 40/100). In the "battery" category, the Vivo X300 Ultra leads (85/100 vs 75/100). Value score: Realme 15x — 52/100, Vivo X300 Ultra — 94/100; 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 Vivo X300 Ultra significantly outperforms the Realme 15x (99/100 vs 43/100). In the "display" category, the Vivo X300 Ultra notably outperforms the Realme 15x (89/100 vs 65/100). In the "camera" category, the Vivo X300 Ultra significantly outperforms the Realme 15x (96/100 vs 40/100). In the "battery" category, the Vivo X300 Ultra is a bit better (85/100 vs 75/100). In the "portability" category, the Realme 15x is a bit better (49/100 vs 39/100).
Specs comparison
| Specification | Realme 15x | Vivo X300 Ultra | |
|---|---|---|---|
| Processor | MediaTek Dimensity 6300 | Qualcomm Snapdragon 8 Elite Gen 5 | |
| AnTuTu | 528398 | 4247433 | |
| Geekbench Single | 771 | 3639 | |
| Geekbench Multi | 1980 | 11047 | |
| Display | 6.8" IPS LCD | 6.8" LTPO OLED | |
| Resolution | 720x1570 | 3168x1440 | |
| Refresh rate | 144 Hz | 120 Hz | |
| Battery | 7000 mAh | 7000 mAh | |
| Charging | 60W | 100W | |
| Wireless charging | — | 40W | |
| DXOMark (camera) | — | 170 | |
| Main camera | 50 MP | 200 MP | |
| Ultrawide | 0 MP | 50 MP | |
| Telephoto | 0 MP | 200 MP | |
| Front camera | 50 MP | 32 MP | |
| RAM | 6GB / 8GB | 12GB / 16GB | |
| Storage | 128GB / 256GB | 256GB / 512GB / 1TB | |
| OS | Android 15 | Android 16 | |
| Brightness (peak) | 1200 nits | — | |
| NFC | no | yes | |
| Protection | IP68/IP69 | IP69 | |
| Dimensions | 166.1×77.9×8.3 mm | 163.0×76.8×8.2 mm | |
| Weight | 212 g | 230 g | |
| Launch price | $250 | $950 |
Camera comparison
Realme 15x
- Main: 50MP f/1.8
- Front: 50MP
Vivo X300 Ultra
- Main: 200MP f/1.6
- Ultrawide: 50MP
- Telephoto: 200MP
- Front: 32MP
Display comparison
Realme 15x
- 6.8" IPS LCD
- Resolution: 720x1570
- Refresh rate: 144 Hz
Vivo X300 Ultra
- 6.8" LTPO OLED
- Resolution: 3168x1440
- Refresh rate: 120 Hz
Battery and charging
Realme 15x
- 7000 mAh
- Wired: 60W
- Wireless charging: no data
Vivo X300 Ultra
- 7000 mAh
- NanoReview test: web browsing 10:18 hrs, total 29:11 hrs
- Wired: 100W
- Wireless: 40W
Overall performance score
We compared Realme 15x and Vivo X300 Ultra, covering their specs and all relevant benchmarks.
Vivo X300 Ultra leads Realme 15x by 87.6% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $700. Realme 15x was $700 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Vivo X300 Ultra significantly outperforms the Realme 15x (99/100 vs 43/100).
display
In the "display" category, the Vivo X300 Ultra notably outperforms the Realme 15x (89/100 vs 65/100).
camera
In the "camera" category, the Vivo X300 Ultra significantly outperforms the Realme 15x (96/100 vs 40/100).
battery
In the "battery" category, the Vivo X300 Ultra is a bit better (85/100 vs 75/100).
portability
In the "portability" category, the Realme 15x is a bit better (49/100 vs 39/100).
Frequently asked questions
Which is better: the Realme 15x or the Vivo X300 Ultra?
The Vivo X300 Ultra significantly outperforms the Realme 15x by 40 points (91/100 vs 51/100).
What is the rating of the Realme 15x and the Vivo X300 Ultra?
The Realme 15x has a MobileRank rating of 51/100, the Vivo X300 Ultra — 91/100.
Which has the better camera: the Realme 15x or the Vivo X300 Ultra?
The Vivo X300 Ultra leads on camera score (96/100 vs 40/100).
Which is more powerful: the Realme 15x or the Vivo X300 Ultra?
The Vivo X300 Ultra leads on performance (99/100 vs 43/100).
Should you choose the Realme 15x over the Vivo X300 Ultra?
The Realme 15x is a better fit for those who care about battery life. The Vivo X300 Ultra is a better fit for gamers and power users, mobile photography enthusiasts, those who care about battery life, budget-conscious buyers.