| Samsung Galaxy M21 | Samsung Galaxy A51 | |
| Specifications | ||
| Brand | Samsung | Samsung |
| Model | - | - |
| Release Date | March 2020 | December 2019 |
| Operating System | One UI (Android 10) | One UI (Android 10) |
| Dimensions | ||
| Size | 159.0 x 75.1 x 8.9 mm 6.26 x 2.96 x 0.35 in |
158.5 x 73.6 x 7.9 mm 6.24 x 2.90 x 0.31 in |
| Weight | 188 g 6.63 oz |
172 g 6.07 oz |
| Screen | ||
| Size | 6.4 inches | 6.5 inches |
| Resolution | 1,080 x 2,340 pixels | 1,080 x 2,400 pixels |
| PPI | 403 | 405 |
| Features | OLED | OLED |
| Cameras | ||
| Rear | Triple camera 48 MP f/2.0 Wide 8 MP f/2.2 Ultra Wide 5 MP f/2.2 Depth |
Quad camera 48 MP f/2.0 Wide 12 MP f/2.2 Ultra Wide 5 MP f/2.4 Macro 5 MP f/2.2 Depth |
| Front | 20 MP f/2.2 Wide | 32 MP f/2.2 Wide |
| Storage | ||
| Memory | 4 GB 6 GB |
4 GB 6 GB 8 GB |
| Fixed | 64 GB 128 GB |
64 GB 128 GB 256 GB |
| Removable | microSDXC | microSDXC |
| Processor | ||
| Chip | Samsung Exynos 9611 Octa-core processor 10 nm |
Samsung Exynos 9611 Octa-core processor 10 nm |
| CPU | 4x 2.30 GHz Cortex-A73 4x 1.70 GHz Cortex-A53 |
4x 2.30 GHz Cortex-A73 4x 1.70 GHz Cortex-A53 |
| GPU | Mali-G72 MP3 | Mali-G72 MP3 |
| Battery | ||
| Capacity | 6,000 mAh | 4,000 mAh |
| Features | Fast charging 15W | Fast charging 15W |
| Removable | ||
| Connectivity | ||
| 5G | ||
| NFC | ||
| 3.5 mm Audio Jack | ||
| Micro USB | ||
| USB Type-C | ||
| Lightning | ||