Compare phones
| Global Score | |
| 11.67 | 9.45 |
| Basic Information | |
| Samsung | Xiaomi |
| Android 11 | Android 11, 10, 9.0 Pie |
| 2021-01-29 | 2019-07-24 |
| 6.50 x 2.98 x 0.35 inches | 6.04 x 2.83 x 0.33 inches |
| 8.04 ounces | 6.13 ounces |
| Phantom black and Silver | Blue, Gray and White |
| Aluminum and Glass (Corning Gorilla Glass Victus) | Glass (Corning Gorilla Glass 5) and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 966.00 | -- |
| Display / Screen | |
| 6.8 inches | 6.1 inches |
| 3200 x 1440 pixels | 1560 x 720 pixels |
| Dynamic AMOLED | Super AMOLED |
| 516 pixels per inch | 282 pixels per inch |
| 1500 cd/m2 brightness | -- |
| No touch screen | No touch screen |
| 9.8 | 7.3 |
| Performance | |
| Qualcomm Snapdragon 888 chipset | Qualcomm Snapdragon 665 chipset |
| Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor | Kryo 260, 64-bit, 11 nm (Octa-Core 2000 MHz) processor |
| 12 GB RAM | 4 GB RAM |
| Adreno 660 GPU | Adreno 610 GPU |
| 9.72 | 9.09 |
| Storage | |
| 128 GB internal memory | 128 GB internal memory |
| No SD card slot | microSDXC (up to 256 GB) external memory slot |
| 10.1 | 13.18 |
| Camera | |
| 108.00 MP + 40.00 MP | 48.00 MP + 32.00 MP |
| f/1.80 aperture | f/1.80 aperture |
| 24.00mm focal length | -- |
| 0.75 inches (1/1.33") sensor | 0.43 inches (1/2.3") 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 |
| 13.75 | 11.44 |
| 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 |
| 10.7 | 6.7 |
| Battery Life | |
| 5000mAh Li - Polymer Battery | 4030mAh Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | -- |
| 4.96 | 4.96 |
| Other Features | |
| Bluetooth 5.1 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | -- |
| -- | Infra-red port |
| 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
The Samsung Galaxy S21 Ultra has a score of 11.67, which is much better than the Xiaomi Mi A3's score of 9.45. Samsung Galaxy S21 Ultra's body is newer than Xiaomi Mi A3's, but it's just a bit thicker and much heavier. These phones come with the same Android 11 operating system. The Samsung Galaxy S21 Ultra has just a bit better hardware performance than Xiaomi Mi A3, and although they both have 8 CPU cores, the Samsung Galaxy S21 Ultra also has 8 GB more RAM memory.
Galaxy S21 Ultra features a lot better looking screen than Xiaomi Mi A3, because it has a little bit larger screen, a much higher resolution of 1440 x 3200 pixels and a much better count of pixels per inch in the screen. The Galaxy S21 Ultra takes a lot better photographs and videos than Xiaomi Mi A3, and although they both have a F1.8 aperture, the Galaxy S21 Ultra also has a lot higher resolution back facing camera, a much higher 7680x4320 video quality and a lot larger sensor capturing more light and vivid colors.
Xiaomi Mi A3 has a much greater storage for games and applications than Samsung Galaxy S21 Ultra, and although they both have exactly the same 128 GB internal memory, the Xiaomi Mi A3 also has an external memory slot that allows up to 256 GB. The Xiaomi Mi A3's battery lifetime is just as good as the Samsung Galaxy S21 Ultra one, although the Xiaomi Mi A3 has a 19 percent lower battery size.