REDMI K90 Ultra vs Samsung Galaxy S21
64.4Performance34.4
78.7Display49.1
43.4Camera40.8
83.2Battery36.9
86.7Features78.7
9 spec wins — REDMI K90 Ultra4 spec wins — Samsung Galaxy S21
InnoReviews verdict
REDMI K90 Ultra wins this phone face-off, 69.1 to 43.6, pulling ahead mainly in battery (+46) and performance (+30). Samsung Galaxy S21 still makes sense if its price or standout specs fit your needs better.
Which would you pick?
Key differences
Reasons to pick the REDMI K90 Ultra
- Stronger performance score: 64 vs 34
- Stronger display score: 79 vs 49
- Stronger battery score: 83 vs 37
- Stronger features score: 87 vs 79
- 317% higher Main camera: 50 MP vs 12 MP
Reasons to pick the Samsung Galaxy S21
- 50% higher ultra-wide: 12 MP vs 8 MP
- 25% lower weight: 171 g vs 227 g
- Has eSIM — the other doesn't
Display
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 |
|---|---|---|
| Screen size | 6.83 ″+10% | 6.2 ″ |
| Panel type | AMOLED | AMOLED |
| Resolution | 1280x2772 | 2400x1080 |
| Pixel density | 447 ppi+6% | 421 ppi |
| Refresh rate | 165 Hz+38% | 120 Hz |
| Peak brightness | 3,500 nits+169% | 1,300 nits |
| Screen-to-body | 90.3 % | — |
Performance
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 |
|---|---|---|
| Chipset | Snapdragon 8 Elite | Samsung Exynos 2100 |
| AnTuTu | — | 746,547Bottom 18% |
| AnTuTu 11 (CPU) | — | 252,025Bottom 14% |
| AnTuTu 11 (GPU) | — | 127,819Bottom 35% |
| AnTuTu 11 (Memory) | — | 144,909Bottom 16% |
| AnTuTu 11 (UX) | — | 221,794Bottom 18% |
| Geekbench 6 (single) | — | 1,430Top 46% |
| Geekbench 6 (multi) | — | 3,550Bottom 50% |
| RAM (max) | 16 GB+100% | 8 GB |
| Storage options | 256/512GB | 128GB / 256GB |
| Storage type | UFS 4.1 | UFS 3.1 |
Camera
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 |
|---|---|---|
| Main camera | 50 MP+317% | 12 MP |
| Main aperture | f/1.7 | f/1.8 |
| Ultra-wide | 8 MP | 12 MP+50% |
| Telephoto | — | 64 MP |
| Max video | 8K@30fps | 8K@24fps |
| Front camera | 20 MP+100% | 10 MP |
| OIS | Yes | Yes |
Battery
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 |
|---|---|---|
| Capacity | 8,550 mAh+114% | 4,000 mAh |
| Wired charging | 100 W+300% | 25 W |
| Wireless charging | — | 15 W |
Design
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 |
|---|---|---|
| Weight | 227 g | 171 g+25% |
| Thickness | 8.2 mm | 7.9 mm+4% |
| IP rating | IP68/IP69 | IP68 |
| Frame material | Aluminum | Aluminum |
Connectivity
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 |
|---|---|---|
| 5G | Yes | Yes |
| Wi-Fi | Wi-Fi 7 | Wi-Fi 6 |
| Bluetooth | 5.4 | 5.0 |
| NFC | Yes | Yes |
| USB | USB-C | USB-C 3.2 |
| eSIM | No | Yes |
Software
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 |
|---|---|---|
| OS at launch | Android 16 (HyperOS 3) | Android 11 (One UI 3.1) |
| OS update pledge | — | 4 years |
Audio
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 |
|---|---|---|
| Stereo speakers | Yes | Yes |
| 3.5mm jack | No | No |