Compare phones
| Global Score | |
| 91.8 | 85.5 |
| Basic Information | |
| Samsung | Samsung |
| Android 11 | Android 11, 10 |
| 2021-01-29 | 2019-12-27 |
| 5.97 x 2.80 x 0.31 inches | 6.24 x 2.90 x 0.31 inches |
| 6.03 ounces | 6.07 ounces |
| Gray, Phantom pink, Violet and White | Prism Crush black, Prism Crush blue, Prism Crush pink and Prism Crush white |
| Aluminum and Plastic | Plastic and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 722.00 | $ 282.00 |
| Display / Screen | |
| 6.2 inches | 6.5 inches |
| 2400 x 1080 pixels | 2400 x 1080 pixels |
| Dynamic AMOLED | Super AMOLED |
| 424 pixels per inch | 405 pixels per inch |
| 1300 cd/m2 brightness | -- |
| No touch screen | No touch screen |
| 9.2 | 8.1 |
| Performance | |
| Qualcomm Snapdragon 888 chipset | Samsung Exynos 9611 chipset |
| Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor | ARM Cortex-A73 and ARM Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor |
| 8 GB RAM | 4 GB RAM |
| Adreno 660 GPU | Mali-G72 MP3 GPU |
| 9.63 | 9.27 |
| Storage | |
| 128 GB internal memory | 128 GB internal memory |
| No SD card slot | microSDXC (up to 512 GB) external memory slot |
| 10.1 | 14.14 |
| Camera | |
| 12.00 MP + 10.00 MP | 48.00 MP + 32.00 MP |
| f/1.80 aperture | f/2.00 aperture |
| 26.00mm focal length | 26.00mm focal length |
| 0.57 inches (1/1.76") sensor | 0.5 inches (1/2") sensor |
| 7680 x 4320 (24 fps) video resolution | 3840 x 2160 (30 fps) (4K) video resolution |
| 1280 x 720 (960 fps) (HD) slow motion video | 1280 x 720 (240 fps) (HD) slow motion video |
| 10.78 | 11.55 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM | Nano SIM, Dual SIM |
| 10.7 | 6.7 |
| 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, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | FM Radio |
Comparison review
Samsung Galaxy S21 is a little bit better than the Samsung Galaxy A51, getting a 91.8 score against 85.5. Samsung Galaxy S21's design has the same thickness than the Samsung Galaxy A51, but it's a little bit lighter. Both phones in this comparison have the same Android 11 OS, so you shouldn't see any differences regarding that.
Samsung Galaxy S21 has a better looking screen than Samsung Galaxy A51, because although it has a little bit smaller screen, and they both have exactly the same resolution of 1080 x 2400px, the Samsung Galaxy S21 also counts with a little bit better pixel density. The Galaxy S21 features a little better processing power than Samsung Galaxy A51, and although they both have 8 processing cores, the Galaxy S21 also has a larger amount of RAM memory.
The Galaxy A51 features a way bigger memory to install applications and games or saving photos and videos than Galaxy S21, and although they both have the same internal memory, the Galaxy A51 also has an external memory card slot that supports a maximum of 512 GB. Galaxy A51 has a battery duration that's just as good as Galaxy S21's battery duration.
The Galaxy A51 has a bit better camera than Samsung Galaxy S21, because although it has a smaller aperture and a tinier back-facing camera sensor offering a lower image quality, and they both have the same 3840x2160 (4K) video resolution, the Galaxy A51 also counts with a lot higher 48 mega pixels resolution back camera and better video frame rates.
Although Galaxy S21 is a better device, it is a lot more expensive than Galaxy A51, and it doesn't have such a good relation between it's price and quality as Galaxy A51. So if you need that extra specs, you can buy Galaxy S21, else you can save some money and buy the Galaxy A51, letting go a couple features and specs.
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