ASUS Zenfone 4 Pro ZS551KL vs Vivo iQOO 15
The ASUS Zenfone 4 Pro ZS551KL (2017) runs on the Qualcomm Snapdragon 835, while the Vivo iQOO 15 (2025) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $599 and $599. By overall MobileRank rating, the Vivo iQOO 15 leads — 86/100 vs 31/100 (a 55-point difference). Key differences: the Vivo iQOO 15 has the bigger battery (7000 mAh vs 3600); the main camera is 12 MP vs 50 MP; the Vivo iQOO 15 is faster in AnTuTu (3,758,268 vs 438,016); the ASUS Zenfone 4 Pro ZS551KL is noticeably lighter (175g vs 215g).
Profile comparison
Category scores
ASUS Zenfone 4 Pro ZS551KL
Vivo iQOO 15
What makes ASUS Zenfone 4 Pro ZS551KL better?
- Lighter: 175g vs 215g
- Better portability (78/100 vs 48/100)
What makes Vivo iQOO 15 better?
- Higher AnTuTu: 3758268 vs 438016
- Better Geekbench Single: 3013 vs 427
- Better Geekbench Multi: 9287 vs 1500
- Bigger battery: 7000 vs 3600 mAh
- Faster charging: 100W vs 18W
- Better main camera: 50MP vs 12MP
- Higher refresh rate: 144Hz vs 60Hz
- Higher performance (94/100 vs 33/100)
- Better camera (78/100 vs 17/100)
- Longer battery life (85/100 vs 13/100)
- Better display (99/100 vs 56/100)
Comparison verdict
Comparing the ASUS Zenfone 4 Pro ZS551KL vs the Vivo iQOO 15, the Vivo iQOO 15 scores 55 points higher (86/100 vs 31/100). In the "performance" category, the Vivo iQOO 15 leads (94/100 vs 33/100). In the "camera" category, the Vivo iQOO 15 leads (78/100 vs 17/100). In the "battery" category, the Vivo iQOO 15 leads (85/100 vs 13/100). Value score: ASUS Zenfone 4 Pro ZS551KL — 0/100, Vivo iQOO 15 — 86/100; 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 iQOO 15 significantly outperforms the ASUS Zenfone 4 Pro ZS551KL (94/100 vs 33/100). In the "display" category, the Vivo iQOO 15 significantly outperforms the ASUS Zenfone 4 Pro ZS551KL (99/100 vs 56/100). In the "camera" category, the Vivo iQOO 15 significantly outperforms the ASUS Zenfone 4 Pro ZS551KL (78/100 vs 17/100). In the "battery" category, the Vivo iQOO 15 significantly outperforms the ASUS Zenfone 4 Pro ZS551KL (85/100 vs 13/100). In the "portability" category, the ASUS Zenfone 4 Pro ZS551KL significantly outperforms the Vivo iQOO 15 (78/100 vs 48/100).
Specs comparison
| Specification | ASUS Zenfone 4 Pro ZS551KL | Vivo iQOO 15 | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 835 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 438016 | 3758268 | |
| Geekbench Single | 427 | 3013 | |
| Geekbench Multi | 1500 | 9287 | |
| Display | 5.5" AMOLED | 6.8" LTPO AMOLED | |
| Resolution | 1080x1920 | 1440x3168 | |
| Refresh rate | 60 Hz | 144 Hz | |
| Battery | 3600 mAh | 7000 mAh | |
| Charging | 18W | 100W | |
| Wireless charging | 0W | 40W | |
| Main camera | 12 MP | 50 MP | |
| Ultrawide | 0 MP | 50 MP | |
| Telephoto | 16 MP | 50 MP | |
| Front camera | 8 MP | 32 MP | |
| RAM | 6GB | 12GB / 16GB | |
| Storage | 64GB / 128GB | 256GB / 512GB / 1TB | |
| OS | Android 7.1.1 Nougat | Android 16 | |
| Brightness (peak) | — | 6000 nits | |
| NFC | yes | yes | |
| Protection | — | IP68 | |
| Dimensions | 156.9×75.6×7.6 mm | 163.7×76.8×8.1 mm | |
| Weight | 175 g | 215 g | |
| Launch price | $599 | $599 |
Camera comparison
ASUS Zenfone 4 Pro ZS551KL
- Main: 12MP f/1.7
- Telephoto: 16MP
- Front: 8MP
Vivo iQOO 15
- Main: 50MP f/1.9
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Display comparison
ASUS Zenfone 4 Pro ZS551KL
- 5.5" AMOLED
- Resolution: 1080x1920
- Refresh rate: 60 Hz
Vivo iQOO 15
- 6.8" LTPO AMOLED
- Resolution: 1440x3168
- Refresh rate: 144 Hz
Battery and charging
ASUS Zenfone 4 Pro ZS551KL
- 3600 mAh
- Wired: 18W
- No wireless charging
Vivo iQOO 15
- 7000 mAh
- NanoReview test: web browsing 18:52 hrs, total 39:26 hrs
- Wired: 100W
- Wireless: 40W
Overall performance score
We compared ASUS Zenfone 4 Pro ZS551KL and Vivo iQOO 15, covering their specs and all relevant benchmarks.
Vivo iQOO 15 leads ASUS Zenfone 4 Pro ZS551KL by 88.3% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $0. Same launch price.
Detailed category analysis
performance
In the "performance" category, the Vivo iQOO 15 significantly outperforms the ASUS Zenfone 4 Pro ZS551KL (94/100 vs 33/100).
display
In the "display" category, the Vivo iQOO 15 significantly outperforms the ASUS Zenfone 4 Pro ZS551KL (99/100 vs 56/100).
camera
In the "camera" category, the Vivo iQOO 15 significantly outperforms the ASUS Zenfone 4 Pro ZS551KL (78/100 vs 17/100).
battery
In the "battery" category, the Vivo iQOO 15 significantly outperforms the ASUS Zenfone 4 Pro ZS551KL (85/100 vs 13/100).
portability
In the "portability" category, the ASUS Zenfone 4 Pro ZS551KL significantly outperforms the Vivo iQOO 15 (78/100 vs 48/100).
Frequently asked questions
Which is better: the ASUS Zenfone 4 Pro ZS551KL or the Vivo iQOO 15?
The Vivo iQOO 15 significantly outperforms the ASUS Zenfone 4 Pro ZS551KL by 55 points (86/100 vs 31/100).
What is the rating of the ASUS Zenfone 4 Pro ZS551KL and the Vivo iQOO 15?
The ASUS Zenfone 4 Pro ZS551KL has a MobileRank rating of 31/100, the Vivo iQOO 15 — 86/100.
Which has the better camera: the ASUS Zenfone 4 Pro ZS551KL or the Vivo iQOO 15?
The Vivo iQOO 15 leads on camera score (78/100 vs 17/100).
Which is more powerful: the ASUS Zenfone 4 Pro ZS551KL or the Vivo iQOO 15?
The Vivo iQOO 15 leads on performance (94/100 vs 33/100).
Should you choose the ASUS Zenfone 4 Pro ZS551KL over the Vivo iQOO 15?
The Vivo iQOO 15 is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers.