OPPO K15 vs Samsung Galaxy S21 Ultra
46.7Performance37.2
53.6Display56.3
58.6Camera72
79.8Battery46.4
86.7Features78.7
6 spec wins — OPPO K155 spec wins — Samsung Galaxy S21 Ultra
InnoReviews verdict
OPPO K15 wins this phone face-off, 61.1 to 53.9, pulling ahead mainly in battery (+33) and performance (+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 OPPO K15
- Stronger performance score: 47 vs 37
- Stronger battery score: 80 vs 46
- Stronger features score: 87 vs 79
- 317% higher ultra-wide: 50 MP vs 12 MP
- 220% higher Wired charging: 80 W vs 25 W
Reasons to pick the Samsung Galaxy S21 Ultra
- Stronger camera score: 72 vs 59
- 116% higher Main camera: 108 MP vs 50 MP
- 25% higher Peak brightness: 1,500 nits vs 1,200 nits
- 12% higher Pixel density: 515 ppi vs 460 ppi
- Has eSIM — the other doesn't
Display
| Spec | OPPO K15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Screen size | 6.59 ″ | 6.8 ″+3% |
| Panel type | AMOLED | LTPO AMOLED |
| Resolution | 2760x1256 | 3200x1440 |
| Pixel density | 460 ppi | 515 ppi+12% |
| Refresh rate | 120 Hz | 120 Hz |
| Peak brightness | 1,200 nits | 1,500 nits+25% |
| Screen-to-body | 88.9 % | — |
Performance
| Spec | OPPO K15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Chipset | Dimensity 7360 Super | 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 | 256GB | 128GB / 256GB / 512GB |
| Storage type | UFS 3.1 | UFS 3.1 |
Camera
| Spec | OPPO K15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Main camera | 50 MP | 108 MP+116% |
| Main aperture | f/1.8 | f/1.8 |
| Ultra-wide | 50 MP+317% | 12 MP |
| Telephoto | — | 10 MP |
| Optical zoom | — | 10 x |
| Max video | 4K@30fps | 8K@24fps |
| Front camera | 50 MP+25% | 40 MP |
| OIS | Yes | Yes |
Battery
| Spec | OPPO K15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Capacity | 8,000 mAh+60% | 5,000 mAh |
| Wired charging | 80 W+220% | 25 W |
| Wireless charging | — | 15 W |
Design
| Spec | OPPO K15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Weight | 205 g+10% | 228 g |
| Thickness | 8.3 mm+7% | 8.9 mm |
| IP rating | IP68/IP69 | IP68 |
| Frame material | Aluminum | Aluminum |
Connectivity
| Spec | OPPO K15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| 5G | Yes | Yes |
| Wi-Fi | Wi-Fi 6 | Wi-Fi 6E |
| Bluetooth | 5.4 | 5.2 |
| NFC | Yes | Yes |
| USB | USB-C 2.0 | USB-C 3.2 |
| eSIM | No | Yes |
Software
| Spec | OPPO K15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| OS at launch | Android 16 (ColorOS 16) | Android 11 (One UI 3.1) |
| OS update pledge | — | 4 years |
Audio
| Spec | OPPO K15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Stereo speakers | Yes | Yes |
| 3.5mm jack | No | No |
Related comparisons
OPPO K15vs Huawei nova 15 ProVSOPPO K15vs Google Pixel 11 Pro FoldVSOPPO K15vs Infinix GT 50 ProVSOPPO K15vs Honor Magic V FlipVSSamsung Galaxy S21 Ultravs realme P4 Power 5GVSSamsung Galaxy S21 Ultravs TECNO POVA Curve 2 5GVSSamsung Galaxy S21 Ultravs Motorola Edge 50 ProVSSamsung Galaxy S21 Ultravs iPhone 16eVS