Redmi K100 Pro Max vs Samsung Galaxy S21 Ultra
64.4Performance37.2
83.8Display56.3
78.2Camera72
92Battery46.4
86.7Features78.7
11 spec wins — Redmi K100 Pro Max5 spec wins — Samsung Galaxy S21 Ultra
InnoReviews verdict
Redmi K100 Pro Max wins this phone face-off, 78.8 to 53.9, pulling ahead mainly in battery (+46) and display (+28). 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 K100 Pro Max
- Stronger performance score: 64 vs 37
- Stronger display score: 84 vs 56
- Stronger camera score: 78 vs 72
- Stronger battery score: 92 vs 46
- Stronger features score: 87 vs 79
Reasons to pick the Samsung Galaxy S21 Ultra
- 100% higher Optical zoom: 10 x vs 5 x
- 25% higher Front camera: 40 MP vs 32 MP
- 24% higher Pixel density: 515 ppi vs 416 ppi
- Has eSIM — the other doesn't
Display
| Spec | Redmi K100 Pro Max | Samsung Galaxy S21 Ultra |
|---|---|---|
| Screen size | 6.9 ″+1% | 6.8 ″ |
| Panel type | AMOLED | LTPO AMOLED |
| Resolution | 1200x2608 | 3200x1440 |
| Pixel density | 416 ppi | 515 ppi+24% |
| Refresh rate | 185 Hz+54% | 120 Hz |
| Peak brightness | 4,500 nits+200% | 1,500 nits |
| Screen-to-body | 91.5 % | — |
Performance
| Spec | Redmi K100 Pro Max | Samsung Galaxy S21 Ultra |
|---|---|---|
| Chipset | Snapdragon 8 Elite Gen 5 | Samsung Exynos 2100 |
| AnTuTu | — | 783,817Bottom 22% |
| AnTuTu 11 (CPU) | — | 263,424Bottom 17% |
| AnTuTu 11 (GPU) | — | 126,989Bottom 33% |
| AnTuTu 11 (Memory) | — | 165,563Bottom 35% |
| AnTuTu 11 (UX) | — | 227,841Bottom 20% |
| Geekbench 6 (single) | — | 1,430Top 46% |
| Geekbench 6 (multi) | — | 3,550Bottom 50% |
| 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 K100 Pro Max | Samsung Galaxy S21 Ultra |
|---|---|---|
| Main camera | 200 MP+85% | 108 MP |
| Main aperture | f/1.7 | f/1.8 |
| Ultra-wide | 50 MP+317% | 12 MP |
| Telephoto | 50 MP+400% | 10 MP |
| Optical zoom | 5 x | 10 x+100% |
| Max video | 8K@30fps | 8K@24fps |
| Front camera | 32 MP | 40 MP+25% |
| OIS | Yes | Yes |
Battery
| Spec | Redmi K100 Pro Max | Samsung Galaxy S21 Ultra |
|---|---|---|
| Capacity | 9,070 mAh+81% | 5,000 mAh |
| Wired charging | 100 W+300% | 25 W |
| Wireless charging | 50 W+233% | 15 W |
Design
| Spec | Redmi K100 Pro Max | Samsung Galaxy S21 Ultra |
|---|---|---|
| Weight | 238 g | 228 g+4% |
| Thickness | 8.5 mm+4% | 8.9 mm |
| IP rating | IP68/IP69 | IP68 |
| Frame material | Aluminum | Aluminum |
Connectivity
| Spec | Redmi K100 Pro Max | Samsung Galaxy S21 Ultra |
|---|---|---|
| 5G | Yes | Yes |
| Wi-Fi | Wi-Fi 7 | Wi-Fi 6E |
| Bluetooth | 6.0 | 5.2 |
| NFC | Yes | Yes |
| USB | USB-C | USB-C 3.2 |
| eSIM | No | Yes |
Software
| Spec | Redmi K100 Pro Max | 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 K100 Pro Max | Samsung Galaxy S21 Ultra |
|---|---|---|
| Stereo speakers | Yes | Yes |
| 3.5mm jack | No | No |
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