Redmi K40 vs Vivo iQOO 15 Ultra
The Redmi K40 (2021) runs on the Qualcomm Snapdragon 870, while the Vivo iQOO 15 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite Gen 5; launch prices were $309 and $799. By overall MobileRank rating, the Vivo iQOO 15 Ultra leads — 89/100 vs 54/100 (a 35-point difference). Key differences: the Vivo iQOO 15 Ultra has the bigger battery (7400 mAh vs 4520); 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 K40 is noticeably lighter (196g vs 227g).
Redmi K40
Vivo iQOO 15 Ultra
- Lighter: 196g vs 227g
- Cheaper at launch: $309 vs $799
- Better portability (64/100 vs 35/100)
- Higher AnTuTu: 4602290 vs 1010069
- Better Geekbench Single: 3640 vs 1298
- Better Geekbench Multi: 11033 vs 3520
- Bigger battery: 7400 vs 4520 mAh
- Faster charging: 120W vs 33W
- Better main camera: 50MP vs 48MP
- Higher refresh rate: 144Hz vs 120Hz
- Higher performance (99/100 vs 61/100)
- Better camera (78/100 vs 36/100)
- Longer battery life (92/100 vs 42/100)
- Better display (99/100 vs 79/100)
Comparing the Redmi K40 vs the Vivo iQOO 15 Ultra, the Vivo iQOO 15 Ultra scores 35 points higher (89/100 vs 54/100). In the "performance" category, the Vivo iQOO 15 Ultra leads (99/100 vs 61/100). In the "camera" category, the Vivo iQOO 15 Ultra leads (78/100 vs 36/100). In the "battery" category, the Vivo iQOO 15 Ultra leads (92/100 vs 42/100). Value score: Redmi K40 — 50/100, Vivo iQOO 15 Ultra — 90/100; it is biased by price level, so it should not be compared directly between devices at different prices. In the "performance" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi K40 (99/100 vs 61/100). In the "display" category, the Vivo iQOO 15 Ultra notably outperforms the Redmi K40 (99/100 vs 79/100). In the "camera" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi K40 (78/100 vs 36/100). In the "battery" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi K40 (92/100 vs 42/100). In the "portability" category, the Redmi K40 notably outperforms the Vivo iQOO 15 Ultra (64/100 vs 35/100).
| Specification | Redmi K40 | Vivo iQOO 15 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 870 | 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 | 2400x1080 | 1440x3168 | |
| Refresh rate | 120 Hz | 144 Hz | |
| Battery | 4520 mAh | 7400 mAh | |
| Charging | 33W | 120W | |
| Wireless charging | — | 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 11 | Android 16 | |
| Brightness (peak) | — | 8000 nits | |
| NFC | — | yes | |
| Protection | — | IP68 | |
| Dimensions | — | 163.7×76.8×8.7 mm | |
| Weight | 196 g | 227 g | |
| Launch price | $309 | $799 |
Redmi K40
- Main: 48MP f/1.79
- Ultrawide: 8MP
- Front: 20MP
Vivo iQOO 15 Ultra
- Main: 50MP f/f/1.9
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Redmi K40
- 6.7" AMOLED
- Resolution: 2400x1080
- Refresh rate: 120 Hz
Vivo iQOO 15 Ultra
- 6.8" LTPO AMOLED
- Resolution: 1440x3168
- Refresh rate: 144 Hz
Redmi K40
- 4520 mAh
- Wired: 33W
- Wireless charging: no data
Vivo iQOO 15 Ultra
- 7400 mAh
- Wired: 120W
- Wireless: 50W
We compared Redmi K40 and Vivo iQOO 15 Ultra, covering their specs and all relevant benchmarks.
Vivo iQOO 15 Ultra leads Redmi K40 by 78.1% in our overall performance rating.
Launch price difference: $490. Redmi K40 was $490 cheaper at launch.
performance
In the "performance" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi K40 (99/100 vs 61/100).
display
In the "display" category, the Vivo iQOO 15 Ultra notably outperforms the Redmi K40 (99/100 vs 79/100).
camera
In the "camera" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi K40 (78/100 vs 36/100).
battery
In the "battery" category, the Vivo iQOO 15 Ultra significantly outperforms the Redmi K40 (92/100 vs 42/100).
portability
In the "portability" category, the Redmi K40 notably outperforms the Vivo iQOO 15 Ultra (64/100 vs 35/100).
Which is better: the Redmi K40 or the Vivo iQOO 15 Ultra?
The Vivo iQOO 15 Ultra significantly outperforms the Redmi K40 by 35 points (89/100 vs 54/100).
What is the rating of the Redmi K40 and the Vivo iQOO 15 Ultra?
The Redmi K40 has a MobileRank rating of 54/100, the Vivo iQOO 15 Ultra — 89/100.
Which has the better camera: the Redmi K40 or the Vivo iQOO 15 Ultra?
The Vivo iQOO 15 Ultra leads on camera score (78/100 vs 36/100).
Which is more powerful: the Redmi K40 or the Vivo iQOO 15 Ultra?
The Vivo iQOO 15 Ultra leads on performance (99/100 vs 61/100).
Should you choose the Redmi K40 over the Vivo iQOO 15 Ultra?
The Redmi K40 is a better fit for active users. The Vivo iQOO 15 Ultra is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers.