POCO X8 vs Samsung Galaxy S21 Ultra
46.7Performance37.2
66.5Display56.3
42.6Camera72
77.2Battery46.4
86.7Features78.7
6 spec wins — POCO X84 spec wins — Samsung Galaxy S21 Ultra
InnoReviews verdict
POCO X8 wins this phone face-off, 59.9 to 53.9, pulling ahead mainly in battery (+31) and display (+10). 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 POCO X8
- Stronger performance score: 47 vs 37
- Stronger display score: 67 vs 56
- Stronger battery score: 77 vs 46
- Stronger features score: 87 vs 79
- 168% higher Wired charging: 67 W vs 25 W
Reasons to pick the Samsung Galaxy S21 Ultra
- Stronger camera score: 72 vs 43
- 150% higher Front camera: 40 MP vs 16 MP
- 116% higher Main camera: 108 MP vs 50 MP
- 15% higher Pixel density: 515 ppi vs 447 ppi
- Has eSIM — the other doesn't
Display
| Spec | POCO X8 | 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 | 120 Hz | 120 Hz |
| Peak brightness | 3,500 nits+133% | 1,500 nits |
| Screen-to-body | 89.5 % | — |
Performance
| Spec | POCO X8 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Chipset | Snapdragon 6s Gen 4 | 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) | 12 GB | 12 GB |
| Storage options | 128/256GB | 128GB / 256GB / 512GB |
| Storage type | UFS 2.2/3.1 | UFS 3.1 |
Camera
| Spec | POCO X8 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Main camera | 50 MP | 108 MP+116% |
| Main aperture | f/1.8 | f/1.8 |
| Ultra-wide | — | 12 MP |
| Telephoto | — | 10 MP |
| Optical zoom | — | 10 x |
| Max video | 1080p@30fps | 8K@24fps |
| Front camera | 16 MP | 40 MP+150% |
| OIS | Yes | Yes |
Battery
| Spec | POCO X8 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Capacity | 8,340 mAh+67% | 5,000 mAh |
| Wired charging | 67 W+168% | 25 W |
| Wireless charging | — | 15 W |
Design
| Spec | POCO X8 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Weight | 223 g+2% | 228 g |
| Thickness | 8.6 mm+3% | 8.9 mm |
| IP rating | IP66/IP68/IP69/IP69K | IP68 |
| Frame material | Plastic | Aluminum |
Connectivity
| Spec | POCO X8 | Samsung Galaxy S21 Ultra |
|---|---|---|
| 5G | Yes | Yes |
| Wi-Fi | Wi-Fi 5 | Wi-Fi 6E |
| Bluetooth | 5.1 | 5.2 |
| NFC | Yes | Yes |
| USB | USB-C 2.0 | USB-C 3.2 |
| eSIM | No | Yes |
Software
| Spec | POCO X8 | Samsung Galaxy S21 Ultra |
|---|---|---|
| OS at launch | Android 16 (HyperOS 3) | Android 11 (One UI 3.1) |
| OS update pledge | — | 4 years |
Audio
| Spec | POCO X8 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Stereo speakers | Yes | Yes |
| 3.5mm jack | No | No |