Redmi K100 Pro vs Samsung Galaxy S21 Ultra
64.4Performance37.2
82.5Display56.3
64.4Camera72
92Battery46.4
86.7Features78.7
10 spec wins — Redmi K100 Pro6 spec wins — Samsung Galaxy S21 Ultra
InnoReviews verdict
Redmi K100 Pro wins this phone face-off, 75.8 to 53.9, pulling ahead mainly in battery (+46) 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 K100 Pro
- Stronger performance score: 64 vs 37
- Stronger display score: 83 vs 56
- Stronger battery score: 92 vs 46
- Stronger features score: 87 vs 79
- 400% higher telephoto: 50 MP vs 10 MP
Reasons to pick the Samsung Galaxy S21 Ultra
- Stronger camera score: 72 vs 64
- 300% higher Optical zoom: 10 x vs 2.5 x
- 50% higher ultra-wide: 12 MP vs 8 MP
- 25% higher Front camera: 40 MP vs 32 MP
- 23% higher Pixel density: 515 ppi vs 419 ppi
Display
| Spec | Redmi K100 Pro | Samsung Galaxy S21 Ultra |
|---|---|---|
| Screen size | 6.59 ″ | 6.8 ″+3% |
| Panel type | AMOLED | LTPO AMOLED |
| Resolution | 1156x2510 | 3200x1440 |
| Pixel density | 419 ppi | 515 ppi+23% |
| Refresh rate | 185 Hz+54% | 120 Hz |
| Peak brightness | 4,500 nits+200% | 1,500 nits |
| Screen-to-body | 89.8 % | — |
Performance
| Spec | Redmi K100 Pro | Samsung Galaxy S21 Ultra |
|---|---|---|
| Chipset | Qualcomm Snapdragon 8 Elite Gen 5 V Series | 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 | 256GB / 512GB | 128GB / 256GB / 512GB |
| Storage type | UFS 4.1 | UFS 3.1 |
Camera
| Spec | Redmi K100 Pro | Samsung Galaxy S21 Ultra |
|---|---|---|
| Main camera | 200 MP+85% | 108 MP |
| Main aperture | f/1.7 | f/1.8 |
| Ultra-wide | 8 MP | 12 MP+50% |
| Telephoto | 50 MP+400% | 10 MP |
| Optical zoom | 2.5 x | 10 x+300% |
| Max video | 4K@60fps | 8K@24fps |
| Front camera | 32 MP | 40 MP+25% |
| OIS | Yes | Yes |
Battery
| Spec | Redmi K100 Pro | Samsung Galaxy S21 Ultra |
|---|---|---|
| Capacity | 8,580 mAh+72% | 5,000 mAh |
| Wired charging | 100 W+300% | 25 W |
| Wireless charging | 50 W+233% | 15 W |
Design
| Spec | Redmi K100 Pro | Samsung Galaxy S21 Ultra |
|---|---|---|
| Weight | 218 g+4% | 228 g |
| Thickness | 8.6 mm+3% | 8.9 mm |
| IP rating | IP66/IP68/IP69 | IP68 |
| Frame material | Aluminum | Aluminum |
Connectivity
| Spec | Redmi K100 Pro | 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 | 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 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Stereo speakers | Yes | Yes |
| 3.5mm jack | No | No |
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