REDMI K90 Ultra vs Samsung Galaxy S21 Ultra
64.4Performance37.2
78.7Display56.3
43.4Camera72
83.2Battery46.4
86.7Features78.7
8 spec wins — REDMI K90 Ultra5 spec wins — Samsung Galaxy S21 Ultra
InnoReviews verdict
REDMI K90 Ultra wins this phone face-off, 69.1 to 53.9, pulling ahead mainly in battery (+37) and performance (+27). Samsung Galaxy S21 Ultra 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 37
- Stronger display score: 79 vs 56
- Stronger battery score: 83 vs 46
- Stronger features score: 87 vs 79
- 300% higher Wired charging: 100 W vs 25 W
Reasons to pick the Samsung Galaxy S21 Ultra
- Stronger camera score: 72 vs 43
- 116% higher Main camera: 108 MP vs 50 MP
- 100% higher Front camera: 40 MP vs 20 MP
- 50% higher ultra-wide: 12 MP vs 8 MP
- 15% higher Pixel density: 515 ppi vs 447 ppi
Display
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 Ultra |
|---|---|---|
| Screen size | 6.83 ″ | 6.8 ″ |
| Panel type | AMOLED | LTPO AMOLED |
| Resolution | 1280x2772 | 3200x1440 |
| Pixel density | 447 ppi | 515 ppi+15% |
| Refresh rate | 165 Hz+38% | 120 Hz |
| Peak brightness | 3,500 nits+133% | 1,500 nits |
| Screen-to-body | 90.3 % | — |
Performance
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 Ultra |
|---|---|---|
| Chipset | Snapdragon 8 Elite | Samsung Exynos 2100 |
| AnTuTu | — | 783,817Bottom 19% |
| AnTuTu 11 (CPU) | — | 263,424Bottom 14% |
| AnTuTu 11 (GPU) | — | 126,989Bottom 29% |
| AnTuTu 11 (Memory) | — | 165,563Bottom 31% |
| AnTuTu 11 (UX) | — | 227,841Bottom 17% |
| Geekbench 6 (single) | — | 1,430Top 48% |
| Geekbench 6 (multi) | — | 3,550Bottom 48% |
| RAM (max) | 16 GB+33% | 12 GB |
| Storage options | 256/512GB | 128GB / 256GB / 512GB |
| Storage type | UFS 4.1 | UFS 3.1 |
Camera
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 Ultra |
|---|---|---|
| Main camera | 50 MP | 108 MP+116% |
| Main aperture | f/1.7 | f/1.8 |
| Ultra-wide | 8 MP | 12 MP+50% |
| Telephoto | — | 10 MP |
| Optical zoom | — | 10 x |
| Max video | 8K@30fps | 8K@24fps |
| Front camera | 20 MP | 40 MP+100% |
| OIS | Yes | Yes |
Battery
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 Ultra |
|---|---|---|
| Capacity | 8,550 mAh+71% | 5,000 mAh |
| Wired charging | 100 W+300% | 25 W |
| Wireless charging | — | 15 W |
Design
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 Ultra |
|---|---|---|
| Weight | 227 g | 228 g |
| Thickness | 8.2 mm+8% | 8.9 mm |
| IP rating | IP68/IP69 | IP68 |
| Frame material | Aluminum | Aluminum |
Connectivity
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 Ultra |
|---|---|---|
| 5G | Yes | Yes |
| Wi-Fi | Wi-Fi 7 | Wi-Fi 6E |
| Bluetooth | 5.4 | 5.2 |
| NFC | Yes | Yes |
| USB | USB-C | USB-C 3.2 |
| eSIM | No | Yes |
Software
| Spec | REDMI K90 Ultra | Samsung Galaxy S21 Ultra |
|---|---|---|
| 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 Ultra |
|---|---|---|
| Stereo speakers | Yes | Yes |
| 3.5mm jack | No | No |
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