Redmi K40S vs Vivo iQOO 15 Ultra
The Redmi K40S (2022) runs on the Qualcomm Snapdragon 870 5G, while the Vivo iQOO 15 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite Gen 5. By overall MobileRank rating, the Vivo iQOO 15 Ultra leads — 84/100 vs 33/100 (a 51-point difference). Key differences: the Vivo iQOO 15 Ultra has the bigger battery (7400 mAh vs 4500); the main camera is 48 MP vs 50 MP; the Vivo iQOO 15 Ultra is faster in AnTuTu (4,602,290 vs 1,010,069); the Redmi K40S is noticeably lighter (195g vs 227g).
Redmi K40S
Vivo iQOO 15 Ultra
- Lighter: 195g vs 227g
- Better design/ergonomics (56/100 vs 16/100)
- Higher AnTuTu: 4602290 vs 1010069
- Better Geekbench Single: 3640 vs 1298
- Better Geekbench Multi: 11033 vs 3520
- Bigger battery: 7400 vs 4500 mAh
- Faster charging: 120W vs 67W
- Better main camera: 50MP vs 48MP
- Higher refresh rate: 144Hz vs 120Hz
- Higher performance (97/100 vs 8/100)
- Better camera (74/100 vs 31/100)
- Longer battery life (86/100 vs 35/100)
Comparing the Redmi K40S vs the Vivo iQOO 15 Ultra, the Vivo iQOO 15 Ultra scores 51 points higher (84/100 vs 33/100). In the "performance" category, the Vivo iQOO 15 Ultra leads (97/100 vs 8/100). In the "camera" category, the Vivo iQOO 15 Ultra leads (74/100 vs 31/100). In the "battery" category, the Vivo iQOO 15 Ultra leads (86/100 vs 35/100). In the "performance" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi K40S (97/100 vs 8/100). In the "display" category, both devices are on the same level — 100/100. In the "camera" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi K40S (74/100 vs 31/100). In the "battery" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi K40S (86/100 vs 35/100). In the "design" category, the Redmi K40S significantly outperforms the Vivo iQOO 15 Ultra (56/100 vs 16/100). In the "value for money" category, both devices are on the same level — 55/100.
| Specification | Redmi K40S | Vivo iQOO 15 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 870 5G | Qualcomm Snapdragon 8 Elite Gen 5 | |
| AnTuTu | 1010069 | 4602290 | |
| Geekbench Single | 1298 | 3640 | |
| Geekbench Multi | 3520 | 11033 | |
| Display | 6.7" AMOLED | 6.8" LTPO AMOLED | |
| Resolution | 1080x2400 | 1440x3168 | |
| Refresh rate | 120 Hz | 144 Hz | |
| Battery | 4500 mAh | 7400 mAh | |
| Charging | 67W | 120W | |
| Wireless charging | 0W | 50W | |
| Main camera | 48 MP | 50 MP | |
| Ultrawide | 8 MP | 50 MP | |
| Telephoto | 0 MP | 50 MP | |
| Front camera | 20 MP | 32 MP | |
| RAM | 6GB / 8GB / 12GB | 12GB / 16GB / 24GB | |
| Storage | 128GB / 256GB | 256GB / 512GB / 1TB | |
| OS | Android 12, MIUI 13 | Android 16 | |
| Brightness (peak) | 1300 nits | 8000 nits | |
| NFC | yes | yes | |
| Protection | — | IP68 | |
| Dimensions | 163.2×76.0×7.7 mm | 163.7×76.8×8.7 mm | |
| Weight | 195 g | 227 g | |
| Price | — | $799 |
Redmi K40S
- Main: 48MP f/f/1.8
- Ultrawide: 8MP
- Front: 20MP
Vivo iQOO 15 Ultra
- Main: 50MP f/f/1.9
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Redmi K40S
- 6.7" AMOLED
- Resolution: 1080x2400
- Refresh rate: 120 Hz
Vivo iQOO 15 Ultra
- 6.8" LTPO AMOLED
- Resolution: 1440x3168
- Refresh rate: 144 Hz
Redmi K40S
- 4500 mAh
- Wired: 67W
- No wireless charging
Vivo iQOO 15 Ultra
- 7400 mAh
- Wired: 120W
- Wireless: 50W
We compared Redmi K40S and Vivo iQOO 15 Ultra, covering their specs and all relevant benchmarks.
Vivo iQOO 15 Ultra leads Redmi K40S by 78.1% in our overall performance rating.
Redmi K40S
Price unknownperformance
In the "performance" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi K40S (97/100 vs 8/100).
display
In the "display" category, both devices are on the same level — 100/100.
camera
In the "camera" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi K40S (74/100 vs 31/100).
battery
In the "battery" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi K40S (86/100 vs 35/100).
design
In the "design" category, the Redmi K40S significantly outperforms the Vivo iQOO 15 Ultra (56/100 vs 16/100).
value for money
In the "value for money" category, both devices are on the same level — 55/100.
Which is better: the Redmi K40S or the Vivo iQOO 15 Ultra?
The Vivo iQOO 15 Ultra significantly outperforms the Redmi K40S by 51 points (84/100 vs 33/100).
What is the rating of the Redmi K40S and the Vivo iQOO 15 Ultra?
The Redmi K40S has a MobileRank rating of 33/100, the Vivo iQOO 15 Ultra — 84/100.
Which has the better camera: the Redmi K40S or the Vivo iQOO 15 Ultra?
The Vivo iQOO 15 Ultra leads on camera score (74/100 vs 31/100).
Which is more powerful: the Redmi K40S or the Vivo iQOO 15 Ultra?
The Vivo iQOO 15 Ultra leads on performance (97/100 vs 8/100).
Should you choose the Redmi K40S over the Vivo iQOO 15 Ultra?
The Redmi K40S is a better fit for everyday use. The Vivo iQOO 15 Ultra is a better fit for gamers and power users, those who care about battery life.