Compare phones
| Global Score | |
| 98.1 | 83 |
| Basic Information | |
| Samsung | Xiaomi |
| Android 11 | Android 10 |
| 2021-01-29 | 2021-01-18 |
| 6.50 x 2.98 x 0.35 inches | 6.37 x 3.04 x 0.36 inches |
| 8.04 ounces | 7.02 ounces |
| Phantom black and Silver | Daybreak purple and Nightfall black |
| Aluminum and Glass (Corning Gorilla Glass Victus) | Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 966.00 | -- |
| Display / Screen | |
| 6.8 inches | 6.5 inches |
| 3200 x 1440 pixels | 2340 x 1080 pixels |
| Dynamic AMOLED | IPS LCD |
| 516 pixels per inch | 396 pixels per inch |
| 1500 cd/m2 brightness | -- |
| No touch screen | No touch screen |
| 9.8 | 8.1 |
| Performance | |
| Qualcomm Snapdragon 888 chipset | MediaTek Dimensity 800U chipset |
| Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor | ARM Cortex-A76 and ARM Cortex-A55, 64-bit, 7 nm (Octa-Core 2400 MHz) processor |
| 12 GB RAM | 4 GB RAM |
| Adreno 660 GPU | Mali-G57 MC3 GPU |
| 9.72 | 9.36 |
| Storage | |
| 128 GB internal memory | 64 GB internal memory |
| No SD card slot | microSDXC (up to 512 GB) external memory slot |
| 10.1 | 11.74 |
| 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 | 1920 x 1080 (120 fps) (Full HD) slow motion video |
| 13.75 | 11.55 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM | Nano SIM, Dual SIM |
| 10.7 | 10.7 |
| Battery Life | |
| 5000mAh Li - Polymer Battery | 5000mAh Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | -- |
| 6.8 | 6.8 |
| Other Features | |
| Bluetooth 5.1 | Bluetooth 5.1 |
| GPS | GPS |
| NFC | 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 a score of 98.1, which is much better than the Xiaomi Redmi Note 9T's score of 83. Both phones in this comparison have Android OS (operating system), but Galaxy S21 Ultra has a more recent 11 version while Xiaomi Redmi Note 9T has Android 10, providing some additional features. The Galaxy S21 Ultra construction is heavier but a little bit thinner than Xiaomi Redmi Note 9T, and both of them were only released 0 months apart.
Samsung Galaxy S21 Ultra has a lot better display than Xiaomi Redmi Note 9T, because it has a better display density, a bit bigger screen and a higher resolution of 1440 x 3200px. Xiaomi Redmi Note 9T counts with a bigger storage capacity to install applications and games or saving photos and videos than Galaxy S21 Ultra, because although it has 0 less internal memory capacity, it also counts with a SD extension slot that supports up to 512 GB.
Samsung Galaxy S21 Ultra has a bit better processing power than Xiaomi Redmi Note 9T, and although they both have the same number of cores, the Samsung Galaxy S21 Ultra also has a greater amount of RAM memory. The Xiaomi Redmi Note 9T's battery life is very similar to the battery life in Galaxy S21 Ultra.
Galaxy S21 Ultra shoots better pictures and videos than Xiaomi Redmi Note 9T, and although they both have the same aperture, the Galaxy S21 Ultra also has a back-facing camera with way more mega-pixels, a way better video quality and a much larger back camera sensor.
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