Compare phones
| Global Score | |
| 87.7 | 91.8 |
| Basic Information | |
| Samsung | Samsung |
| Android 10 | Android 11 |
| 2020-09-11 | 2021-01-29 |
| 6.45 x 3.00 x 0.37 inches | 5.97 x 2.80 x 0.31 inches |
| 7.51 ounces | 6.03 ounces |
| Black and White | Gray, Phantom pink, Violet and White |
| Plastic and Plastic | Aluminum and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| -- | $ 722.00 |
| Display / Screen | |
| 6.7 inches | 6.2 inches |
| 2340 x 1080 pixels | 2400 x 1080 pixels |
| Super AMOLED Plus | Dynamic AMOLED |
| 385 pixels per inch | 424 pixels per inch |
| -- | 1300 cd/m2 brightness |
| No touch screen | No touch screen |
| 8 | 9.2 |
| Performance | |
| Qualcomm Snapdragon 730 SM7150-AA chipset | Qualcomm Snapdragon 888 chipset |
| Kryo 470, 64-bit, 8 nm (Octa-Core 2200 MHz) processor | Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor |
| 6 GB RAM | 8 GB RAM |
| Adreno 618 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 | |
| 64.00 MP + 32.00 MP | 12.00 MP + 10.00 MP |
| f/1.80 aperture | f/1.80 aperture |
| 26.00mm focal length | 26.00mm focal length |
| 0.57 inches (1/1.76") 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 (960 fps) (HD) slow motion video |
| 11.88 | 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 | |
| 7000mAh Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| -- | Wireless Charging |
| 8.32 | 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
Samsung Galaxy S21 has an overall score of 91.8, which is a little bit better than Samsung Galaxy M51's global score of 87.7. Even when Samsung Galaxy S21 and Samsung Galaxy M51 were only released with a couple months difference, Samsung Galaxy S21 is somewhat lighter and somewhat thinner. Both phones in this review come with Android OS (Operating System), but Samsung Galaxy S21 has a newer 11 version and Samsung Galaxy M51 has Android 10 version.
The Samsung Galaxy S21 counts with a sharper screen than Galaxy M51, because although it has a quite smaller display, it also counts with a quite better resolution of 1080 x 2400 and a little bit more pixels per screen inch. Galaxy S21 has just a little better performance than Galaxy M51, and although they both have a Octa-Core CPU, the Galaxy S21 also has more RAM.
Samsung Galaxy M51 captures much better videos and photos than Galaxy S21, and although they both have the same (4K) video quality, the same back camera sensor size and a same size aperture, the Samsung Galaxy M51 also has a lot better 64 megapixels resolution camera in the back and better 30 frames per second video frame rates.
The Galaxy M51 counts with a much bigger memory for applications and games than Galaxy S21, and although they both have exactly the same 128 GB internal memory capacity, the Galaxy M51 also has an external memory card slot that holds a maximum of 512 GB. The Samsung Galaxy M51 counts with a superior battery life than Samsung Galaxy S21, because it has 7000mAh of battery capacity against 4000mAh.
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