Redmi K90 vs Samsung Galaxy A21s
The Redmi K90 (2025) runs on the Qualcomm Snapdragon 8 Elite, while the Samsung Galaxy A21s (2020) runs on the Exynos 850; estimated prices are $401 and $215. By overall MobileRank rating, the Redmi K90 leads — 68/100 vs 19/100 (a 49-point difference). Key differences: the Redmi K90 has the bigger battery (7100 mAh vs 5000); the main camera is 50 MP vs 48 MP; the Redmi K90 is faster in AnTuTu (3,088,357 vs 234,339).
Redmi K90
Samsung Galaxy A21s
- Higher AnTuTu: 3088357 vs 234339
- Better Geekbench Single: 3050 vs 300
- Better Geekbench Multi: 9300 vs 836
- Bigger battery: 7100 vs 5000 mAh
- Better main camera: 50MP vs 48MP
- Higher refresh rate: 120Hz vs 60Hz
- Higher performance (69/100 vs 0/100)
- Better camera (53/100 vs 25/100)
- Longer battery life (71/100 vs 36/100)
- Better display (100/100 vs 0/100)
- Lighter: 192g vs 206g
- Cheaper: $215 vs $401
- Better design/ergonomics (60/100 vs 42/100)
- Better value for money (95/100 vs 82/100)
Comparing the Redmi K90 vs the Samsung Galaxy A21s, the Redmi K90 scores 49 points higher (68/100 vs 19/100). In the "performance" category, the Redmi K90 leads (69/100 vs 0/100). In the "camera" category, the Redmi K90 leads (53/100 vs 25/100). In the "battery" category, the Redmi K90 leads (71/100 vs 36/100). In the "value for money" category, the Samsung Galaxy A21s leads (95/100 vs 82/100). In the "performance" category, the Redmi K90 significantly outperforms the Samsung Galaxy A21s (69/100 vs 0/100). In the "display" category, the Redmi K90 significantly outperforms the Samsung Galaxy A21s (100/100 vs 0/100). In the "camera" category, the Redmi K90 notably outperforms the Samsung Galaxy A21s (53/100 vs 25/100). In the "battery" category, the Redmi K90 significantly outperforms the Samsung Galaxy A21s (71/100 vs 36/100). In the "design" category, the Samsung Galaxy A21s notably outperforms the Redmi K90 (60/100 vs 42/100). In the "value for money" category, the Samsung Galaxy A21s is a bit better (95/100 vs 82/100).
| Specification | Redmi K90 | Samsung Galaxy A21s | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite | Exynos 850 | |
| AnTuTu | 3088357 | 234339 | |
| Geekbench Single | 3050 | 300 | |
| Geekbench Multi | 9300 | 836 | |
| Display | 6.6" AMOLED | 6.5" IPS LCD | |
| Resolution | 2510x1156 | — | |
| Refresh rate | 120 Hz | 60 Hz | |
| Battery | 7100 mAh | 5000 mAh | |
| Charging | 100W | — | |
| Main camera | 50 MP | 48 MP | |
| Ultrawide | 8 MP | 0 MP | |
| Telephoto | 50 MP | 0 MP | |
| Front camera | 20 MP | 13 MP | |
| RAM | 12GB / 16GB | 3GB / 4GB / 6GB | |
| Storage | 256GB / 512GB | 32GB / 64GB | |
| OS | Android 16 | — | |
| Brightness (peak) | 3500 nits | — | |
| NFC | yes | yes | |
| Protection | IP68 | — | |
| Dimensions | 157.5×75.3×8.0 mm | 163.7×75.3×8.9 mm | |
| Weight | 206 g | 192 g | |
| Price | $401 | $215 |
Redmi K90
- Main: 50MP f/f/1.9
- Ultrawide: 8MP
- Telephoto: 50MP
- Front: 20MP
Samsung Galaxy A21s
- Main: 48MP
- Front: 13MP
Redmi K90
- 6.6" AMOLED
- Resolution: 2510x1156
- Refresh rate: 120 Hz
Samsung Galaxy A21s
- 6.5" IPS LCD
- Refresh rate: 60 Hz
Redmi K90
- 7100 mAh
- Wired: 100W
- No wireless charging
Samsung Galaxy A21s
- 5000 mAh
- No wireless charging
We compared Redmi K90 and Samsung Galaxy A21s, covering their specs and all relevant benchmarks.
Redmi K90 leads Samsung Galaxy A21s by 1217.9% in our overall performance rating.
Price difference: $186. Samsung Galaxy A21s is cheaper by $186.
performance
In the "performance" category, the Redmi K90 significantly outperforms the Samsung Galaxy A21s (69/100 vs 0/100).
display
In the "display" category, the Redmi K90 significantly outperforms the Samsung Galaxy A21s (100/100 vs 0/100).
camera
In the "camera" category, the Redmi K90 notably outperforms the Samsung Galaxy A21s (53/100 vs 25/100).
battery
In the "battery" category, the Redmi K90 significantly outperforms the Samsung Galaxy A21s (71/100 vs 36/100).
design
In the "design" category, the Samsung Galaxy A21s notably outperforms the Redmi K90 (60/100 vs 42/100).
value for money
In the "value for money" category, the Samsung Galaxy A21s is a bit better (95/100 vs 82/100).
Which is better: the Redmi K90 or the Samsung Galaxy A21s?
The Redmi K90 significantly outperforms the Samsung Galaxy A21s by 49 points (68/100 vs 19/100).
What is the rating of the Redmi K90 and the Samsung Galaxy A21s?
The Redmi K90 has a MobileRank rating of 68/100, the Samsung Galaxy A21s — 19/100.
Which has the better camera: the Redmi K90 or the Samsung Galaxy A21s?
The Redmi K90 leads on camera score (53/100 vs 25/100).
Which is more powerful: the Redmi K90 or the Samsung Galaxy A21s?
The Redmi K90 leads on performance (69/100 vs 0/100).
Should you choose the Redmi K90 over the Samsung Galaxy A21s?
The Redmi K90 is a better fit for active users, budget-conscious buyers. The Samsung Galaxy A21s is a better fit for budget-conscious buyers.