Redmi K40 vs Vivo iQOO 15
The Redmi K40 (2021) runs on the Qualcomm Snapdragon 870, while the Vivo iQOO 15 (2025) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $309 and $599. By overall MobileRank rating, the Vivo iQOO 15 leads — 86/100 vs 54/100 (a 32-point difference). Key differences: the Vivo iQOO 15 has the bigger battery (7000 mAh vs 4520); the main camera is 48 MP vs 50 MP; the Vivo iQOO 15 is faster in AnTuTu (3,758,268 vs 1,010,069); the Redmi K40 is noticeably lighter (196g vs 215g).
Profile comparison
Category scores
Redmi K40
Vivo iQOO 15
What makes Redmi K40 better?
- Lighter: 196g vs 215g
- Cheaper at launch: $309 vs $599
- Better portability (64/100 vs 48/100)
What makes Vivo iQOO 15 better?
- Higher AnTuTu: 3758268 vs 1010069
- Better Geekbench Single: 3013 vs 1298
- Better Geekbench Multi: 9287 vs 3520
- Bigger battery: 7000 vs 4520 mAh
- Faster charging: 100W vs 33W
- Better main camera: 50MP vs 48MP
- Higher refresh rate: 144Hz vs 120Hz
- Higher performance (94/100 vs 61/100)
- Better camera (78/100 vs 36/100)
- Longer battery life (85/100 vs 42/100)
- Better display (99/100 vs 79/100)
Comparison verdict
Comparing the Redmi K40 vs the Vivo iQOO 15, the Vivo iQOO 15 scores 32 points higher (86/100 vs 54/100). In the "performance" category, the Vivo iQOO 15 leads (94/100 vs 61/100). In the "camera" category, the Vivo iQOO 15 leads (78/100 vs 36/100). In the "battery" category, the Vivo iQOO 15 leads (85/100 vs 42/100). Value score: Redmi K40 — 46/100, 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 Redmi K40 (94/100 vs 61/100). In the "display" category, the Vivo iQOO 15 notably outperforms the Redmi K40 (99/100 vs 79/100). In the "camera" category, the Vivo iQOO 15 significantly outperforms the Redmi K40 (78/100 vs 36/100). In the "battery" category, the Vivo iQOO 15 significantly outperforms the Redmi K40 (85/100 vs 42/100). In the "portability" category, the Redmi K40 notably outperforms the Vivo iQOO 15 (64/100 vs 48/100).
Specs comparison
| Specification | Redmi K40 | Vivo iQOO 15 | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 870 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 1010069 | 3758268 | |
| Geekbench Single | 1298 | 3013 | |
| Geekbench Multi | 3520 | 9287 | |
| Display | 6.7" AMOLED | 6.8" LTPO AMOLED | |
| Resolution | 2400x1080 | 1440x3168 | |
| Refresh rate | 120 Hz | 144 Hz | |
| Battery | 4520 mAh | 7000 mAh | |
| Charging | 33W | 100W | |
| Wireless charging | — | 40W | |
| 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 | |
| Storage | 128GB / 256GB | 256GB / 512GB / 1TB | |
| OS | Android 11 | Android 16 | |
| Brightness (peak) | 1300 nits | 6000 nits | |
| NFC | yes | yes | |
| Protection | — | IP68 | |
| Dimensions | 163.7×76.4×7.8 mm | 163.7×76.8×8.1 mm | |
| Weight | 196 g | 215 g | |
| Launch price | $309 | $599 |
Camera comparison
Redmi K40
- Main: 48MP f/1.79
- Ultrawide: 8MP
- Front: 20MP
Vivo iQOO 15
- Main: 50MP f/1.9
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Display comparison
Redmi K40
- 6.7" AMOLED
- Resolution: 2400x1080
- Refresh rate: 120 Hz
Vivo iQOO 15
- 6.8" LTPO AMOLED
- Resolution: 1440x3168
- Refresh rate: 144 Hz
Battery and charging
Redmi K40
- 4520 mAh
- Wired: 33W
- Wireless charging: no data
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 Redmi K40 and Vivo iQOO 15, covering their specs and all relevant benchmarks.
Vivo iQOO 15 leads Redmi K40 by 73.1% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $290. Redmi K40 was $290 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Vivo iQOO 15 significantly outperforms the Redmi K40 (94/100 vs 61/100).
display
In the "display" category, the Vivo iQOO 15 notably outperforms the Redmi K40 (99/100 vs 79/100).
camera
In the "camera" category, the Vivo iQOO 15 significantly outperforms the Redmi K40 (78/100 vs 36/100).
battery
In the "battery" category, the Vivo iQOO 15 significantly outperforms the Redmi K40 (85/100 vs 42/100).
portability
In the "portability" category, the Redmi K40 notably outperforms the Vivo iQOO 15 (64/100 vs 48/100).
Frequently asked questions
Which is better: the Redmi K40 or the Vivo iQOO 15?
The Vivo iQOO 15 significantly outperforms the Redmi K40 by 32 points (86/100 vs 54/100).
What is the rating of the Redmi K40 and the Vivo iQOO 15?
The Redmi K40 has a MobileRank rating of 54/100, the Vivo iQOO 15 — 86/100.
Which has the better camera: the Redmi K40 or the Vivo iQOO 15?
The Vivo iQOO 15 leads on camera score (78/100 vs 36/100).
Which is more powerful: the Redmi K40 or the Vivo iQOO 15?
The Vivo iQOO 15 leads on performance (94/100 vs 61/100).
Should you choose the Redmi K40 over the Vivo iQOO 15?
The Redmi K40 is a better fit for active users. The Vivo iQOO 15 is a better fit for gamers and power users, those who care about battery life, budget-conscious buyers.