Compare phones
| Global Score | |
| 98.1 | 83.3 |
| Basic Information | |
| Samsung | Xiaomi |
| Android 11 | Android 10, 9.0 Pie, 8.0 Oreo |
| 2021-01-29 | 2018-06-05 |
| 6.50 x 2.98 x 0.35 inches | 6.10 x 2.94 x 0.30 inches |
| 8.04 ounces | 6.17 ounces |
| Phantom black and Silver | Black, Blue, Gold and White |
| Aluminum and Glass (Corning Gorilla Glass Victus) | Glass (Corning Gorilla Glass 5) |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 966.00 | -- |
| Display / Screen | |
| 6.8 inches | 6.2 inches |
| 3200 x 1440 pixels | 2248 x 1080 pixels |
| Dynamic AMOLED | AMOLED |
| 516 pixels per inch | 402 pixels per inch |
| 1500 cd/m2 brightness | 600 cd/m2 brightness |
| No touch screen | No touch screen |
| 9.8 | 8.6 |
| Performance | |
| Qualcomm Snapdragon 888 chipset | Qualcomm Snapdragon 845 SDM845 chipset |
| Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor | Kryo 385, 64-bit, 10 nm (Octa-Core 2800 MHz) processor |
| 12 GB RAM | 6 GB RAM |
| Adreno 660 GPU | Adreno 630 GPU |
| 9.72 | 9.63 |
| Storage | |
| 128 GB internal memory | 256 GB internal memory |
| No SD card slot | No SD card slot |
| 10.1 | 13.3 |
| Camera | |
| 108.00 MP + 40.00 MP | 12.00 MP + 20.00 MP |
| f/1.80 aperture | f/1.80 aperture |
| 24.00mm focal length | 56.00mm focal length |
| 0.75 inches (1/1.33") sensor | 0.39 inches (1/2.55") 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 (960 fps) (HD) slow motion video |
| 13.75 | 9.9 |
| 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 | |
| 5000mAh Li - Polymer Battery | 3400mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | -- |
| 6.8 | 5.36 |
| Other Features | |
| Bluetooth 5.1 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | NFC |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | -- |
Comparison review
The Galaxy S21 Ultra has an overall score of 98.1, which is much better than Xiaomi Mi 8's overall score of 83.3. These phones use Android OS (operating system), but the Galaxy S21 Ultra has 11 version while Xiaomi Mi 8 has Android 10 version, providing a couple additional features. The Galaxy S21 Ultra design is way newer, but noticeably heavier and thicker than Xiaomi Mi 8.
Galaxy S21 Ultra has just a little better processing power than Xiaomi Mi 8, and although they both have a Octa-Core CPU, the Galaxy S21 Ultra also has 6 GB more RAM. The Galaxy S21 Ultra counts with a much better screen than Xiaomi Mi 8, because it has a way brighter screen, a quite larger screen, a better resolution of 1440 x 3200px and a higher screen density.
Xiaomi Mi 8 counts with a very superior storage capacity to install games and applications than Galaxy S21 Ultra, because it has 128 GB more internal storage. Samsung Galaxy S21 Ultra takes way better pictures and videos than Xiaomi Mi 8, and although they both have the same aperture, the Samsung Galaxy S21 Ultra also has a way better video definition, a lot bigger sensor taking lot higher quality photographs and videos and a back facing camera with a much better resolution.
The Samsung Galaxy S21 Ultra counts with a superior battery performance than Xiaomi Mi 8, because it has a 5000mAh battery size against 3400mAh.
Disclaimer: As an Amazon Associate I earn from qualifying purchases.