Compare phones
| Global Score | |
| 85.5 | 91.8 |
| Basic Information | |
| Samsung | Samsung |
| Android 11, 10 | Android 11 |
| 2019-12-27 | 2021-01-29 |
| 6.24 x 2.90 x 0.31 inches | 5.97 x 2.80 x 0.31 inches |
| 6.07 ounces | 6.03 ounces |
| Prism Crush black, Prism Crush blue, Prism Crush pink and Prism Crush white | Gray, Phantom pink, Violet and White |
| Plastic and Plastic | Aluminum and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 282.00 | $ 722.00 |
| Display / Screen | |
| 6.5 inches | 6.2 inches |
| 2400 x 1080 pixels | 2400 x 1080 pixels |
| Super AMOLED | Dynamic AMOLED |
| 405 pixels per inch | 424 pixels per inch |
| -- | 1300 cd/m2 brightness |
| No touch screen | No touch screen |
| 8.1 | 9.2 |
| Performance | |
| Samsung Exynos 9611 chipset | Qualcomm Snapdragon 888 chipset |
| ARM Cortex-A73 and ARM Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor | Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor |
| 4 GB RAM | 8 GB RAM |
| Mali-G72 MP3 GPU | Adreno 660 GPU |
| 9.27 | 9.63 |
| Storage | |
| 128 GB internal memory | 128 GB internal memory |
| microSDXC (up to 512 GB) external memory slot | No SD card slot |
| 14.14 | 10.1 |
| Camera | |
| 48.00 MP + 32.00 MP | 12.00 MP + 10.00 MP |
| f/2.00 aperture | f/1.80 aperture |
| 26.00mm focal length | 26.00mm focal length |
| 0.5 inches (1/2") sensor | 0.57 inches (1/1.76") sensor |
| 3840 x 2160 (30 fps) (4K) video resolution | 7680 x 4320 (24 fps) video resolution |
| 1280 x 720 (240 fps) (HD) slow motion video | 1280 x 720 (960 fps) (HD) slow motion video |
| 11.55 | 10.78 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM, Dual SIM | Nano SIM |
| 6.7 | 10.7 |
| Battery Life | |
| 4000mAh Li - Polymer Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| -- | Wireless Charging |
| 5.92 | 5.92 |
| Other Features | |
| Bluetooth 5.0 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | NFC |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | FM Radio |
Comparison review
Galaxy S21 has a global score of 91.8, which is a bit better than the Samsung Galaxy A51's 85.5 general score. These phones include the same Android 11 OS (operating system). The Galaxy S21 is a just a bit lighter phone than Samsung Galaxy A51, but both of them are equally thin. Galaxy S21 has a little better hardware performance than Galaxy A51, and although they both have the same number of cores, the Galaxy S21 also has a larger amount of RAM.
The Samsung Galaxy S21 counts with a more vivid display than Samsung Galaxy A51, because although it has a quite smaller screen, and they both have the same resolution of 1080 x 2400, the Samsung Galaxy S21 also counts with a little greater pixel density. The Galaxy A51 features a slightly better camera than Samsung Galaxy S21, because although it has a smaller camera sensor taking lower quality videos and photos and a smaller aperture which is not recommended for capturing images or videos in low light environments, and they both have the same 3840x2160 video resolution, the Galaxy A51 also counts with a lot more mega-pixels camera in the back and higher 30 frames per second video frame rates.
The Galaxy A51 features a superior memory capacity to store more apps and games than Galaxy S21, and although they both have exactly the same 128 GB internal storage, the Galaxy A51 also has a SD memory card expansion slot that supports up to 512 GB. Galaxy S21 features a battery lifetime that is just as good as the Samsung Galaxy A51 one.
Although Galaxy S21 is a better device, it costs a lot more money than Galaxy A51, and it doesn't have such a good relation between it's price and quality as Galaxy A51. If you prefer to save a few dollars, you can buy the Galaxy A51, giving up a couple features and specs, but you'll get the most out of your money.
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