Compare phones
| Global Score | |
| 11.67 | 8.89 |
| Basic Information | |
| Samsung | Xiaomi |
| Android 11 | Android 10 |
| 2021-01-29 | 2019-10-16 |
| 6.50 x 2.98 x 0.35 inches | 6.23 x 2.96 x 0.33 inches |
| 8.04 ounces | 6.70 ounces |
| Phantom black and Silver | Cosmic Purple, Moonlight White, Nebula Purple, Neptune Blue and Space Black |
| Aluminum and Glass (Corning Gorilla Glass Victus) | Glass and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 966.00 | $ 227.00 |
| Display / Screen | |
| 6.8 inches | 6.3 inches |
| 3200 x 1440 pixels | 2340 x 1080 pixels |
| Dynamic AMOLED | IPS LCD |
| 516 pixels per inch | 409 pixels per inch |
| 1500 cd/m2 brightness | -- |
| No touch screen | No touch screen |
| 9.8 | 8.1 |
| Performance | |
| Qualcomm Snapdragon 888 chipset | Qualcomm Snapdragon 665 SM6125 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 | 3 GB RAM |
| Adreno 660 GPU | Adreno 610 GPU |
| 9.72 | 9.09 |
| Storage | |
| 128 GB internal memory | 32 GB internal memory |
| No SD card slot | microSDXC (up to 128 GB) external memory slot |
| 10.1 | 8.12 |
| Camera | |
| 108.00 MP + 40.00 MP | 48.00 MP + 13.00 MP |
| f/1.80 aperture | f/1.80 aperture |
| 24.00mm focal length | -- |
| 0.75 inches (1/1.33") 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 |
| 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) and HSPA |
| Nano SIM | Nano SIM, Dual SIM |
| 10.7 | 6.1 |
| Battery Life | |
| 5000mAh Li - Polymer Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | -- |
| 4.96 | 4.88 |
| Other Features | |
| Bluetooth 5.1 | Bluetooth 4.2 |
| 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 | -- |
Comparison review
Galaxy S21 Ultra has an overall score of 11.67, which is way better than Xiaomi Redmi Note 8's global score of 8.89. These phones work with Android OS, but the Galaxy S21 Ultra has a newer 11 version and Xiaomi Redmi Note 8 has Android 10 version, so it provides some nice extra features. Even though Galaxy S21 Ultra is newer than Xiaomi Redmi Note 8, it is somewhat heavier and a little bit thicker.
Galaxy S21 Ultra features a lot better display than Xiaomi Redmi Note 8, because it has a little larger screen, a better resolution of 1440 x 3200px and a better quantity of pixels per inch of screen. Samsung Galaxy S21 Ultra has a much greater memory to install applications and games than Xiaomi Redmi Note 8, because although it has no external memory card slot, it also counts with 128 GB internal memory capacity.
Galaxy S21 Ultra has a little faster processing unit than Xiaomi Redmi Note 8, and although they both have the same number of cores, the Galaxy S21 Ultra also has 9 GB more RAM. The Galaxy S21 Ultra shoots greater pictures and videos than Xiaomi Redmi Note 8, and although they both have a same size diafragm aperture, the Galaxy S21 Ultra also has a way better video resolution, a lot better 108 MP resolution back camera and a lot larger back camera sensor.
The Samsung Galaxy S21 Ultra features a bit superior battery performance than Xiaomi Redmi Note 8, because it has a 25 percent greater battery capacity.
The Galaxy S21 Ultra is a lot more expensive than Xiaomi Redmi Note 8, but it's still a great deal, as you can get a lot more for that extra money.