| OnePlus 9 Pro | Samsung Galaxy A21 | |
| Specifications | ||
| Brand | OnePlus | Samsung |
| Model | - | - |
| Release Date | March 2021 | June 2020 |
| Operating System | OxygenOS (Android 11) | One UI (Android 10) |
| Dimensions | ||
| Size | 163.2 x 73.6 x 8.7 mm 6.43 x 2.90 x 0.34 in |
167.8 x 76.7 x 8.1 mm 6.61 x 3.02 x 0.32 in |
| Weight | 197 g 6.95 oz |
193 g 6.81 oz |
| Screen | ||
| Size | 6.7 inches | 6.5 inches |
| Resolution | 1,440 x 3,216 pixels | 720 x 1,600 pixels |
| PPI | 525 | 270 |
| Features | OLED, 120Hz | - |
| Cameras | ||
| Rear | Quad camera 48 MP f/1.8 Wide 50 MP f/2.2 Ultra Wide 8 MP f/2.4 Telephoto 2 MP f/2.4 Depth |
Quad camera 16 MP f/1.8 Wide 8 MP f/2.2 Ultra Wide 2 MP f/2.4 Macro 2 MP f/2.4 Depth |
| Front | 16 MP f/2.4 Wide | 13 MP f/2.0 Wide |
| Storage | ||
| Memory | 8 GB 12 GB |
3 GB |
| Fixed | 128 GB 256 GB |
32 GB |
| Removable | - | microSDXC |
| Processor | ||
| Chip | Qualcomm Snapdragon 888 5G SM8350 Octa-core processor 5 nm |
MediaTek Helio P35 Octa-core processor 12 nm |
| CPU | 1x 2.84 GHz Kryo 680 Prime 3x 2.42 GHz Kryo 680 Gold 4x 1.80 GHz Kryo 680 Silver |
4x 2.35 GHz Cortex-A53 4x 1.80 GHz Cortex-A53 |
| GPU | Adreno 660 | PowerVR GE8320 |
| Battery | ||
| Capacity | 4,500 mAh | 4,000 mAh |
| Features | Fast charging 65W | Fast charging 15W |
| Removable | ||
| Connectivity | ||
| 5G | ||
| NFC | ||
| 3.5 mm Audio Jack | ||
| Micro USB | ||
| USB Type-C | ||
| Lightning | ||