Compare phones
| Global Score | |
| 98.1 | 76.6 |
| Basic Information | |
| Samsung | Xiaomi |
| Android 11 | Android 10 |
| 2021-01-29 | 2020-05-20 |
| 6.50 x 2.98 x 0.35 inches | 6.39 x 3.04 x 0.35 inches |
| 8.04 ounces | 7.02 ounces |
| Phantom black and Silver | Forest green, Midnight gray and Polar white |
| Aluminum and Glass (Corning Gorilla Glass Victus) | Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 966.00 | $ 283.00 |
| 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 |
| Performance | |
| Qualcomm Snapdragon 888 chipset | MediaTek Helio G85 chipset |
| Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor | Arm Cortex-A75 and ArmCortex-A55, 64-bit, 12 nm (Octa-Core 2000 MHz) processor |
| 12 GB RAM | 3 GB RAM |
| Adreno 660 GPU | Mali G52 MC2 GPU |
| 9.72 | 9.09 |
| Storage | |
| 128 GB internal memory | 64 GB internal memory |
| No SD card slot | microSDXC (up to 128 GB) external memory slot |
| 10.1 | 10.02 |
| 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 | 1920 x 1080 (30 fps) (Full HD) video resolution |
| 1280 x 720 (960 fps) (HD) slow motion video | 1280 x 720 (120 fps) (HD) slow motion video |
| 13.75 | 11 |
| 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 | 5020mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | -- |
| 6.8 | 6.8 |
| Other Features | |
| Bluetooth 5.1 | Bluetooth 5.0 |
| 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
The Galaxy S21 Ultra has a general score of 98.1, which is way better than Xiaomi Redmi Note 9's 76.6 global score. Galaxy S21 Ultra's design has the same thickness than the Xiaomi Redmi Note 9, but it's heavier. These devices work with Android OS, but the Galaxy S21 Ultra has the newer 11 version while Xiaomi Redmi Note 9 has Android 10 version, so it counts with some extra features and optimized performance.
Samsung Galaxy S21 Ultra has a much sharper display than Xiaomi Redmi Note 9, because it has a little bit bigger display, a higher resolution of 1440 x 3200 pixels and more pixels per display inch. Samsung Galaxy S21 Ultra has a slightly bigger storage for apps and games than Xiaomi Redmi Note 9, because although it has no external memory slot, it also counts with 128 GB internal memory.
The Galaxy S21 Ultra features a bit better processor than Xiaomi Redmi Note 9, and although they both have the same number of cores, the Galaxy S21 Ultra also has 9 GB more RAM memory. The Xiaomi Redmi Note 9 counts with a battery life that is very similar to Samsung Galaxy S21 Ultra's battery life, although the Xiaomi Redmi Note 9 also has 5020mAh of battery capacity.
The Samsung Galaxy S21 Ultra takes a lot better videos and photos than Xiaomi Redmi Note 9, and although they both have a F1.8 camera aperture, the Samsung Galaxy S21 Ultra also has a lot bigger sensor, a back camera with a lot higher 108 megapixels resolution and a lot better 7680x4320 video quality.
The Galaxy S21 Ultra costs a lot more money than the Xiaomi Redmi Note 9, but you can get a much better phone for that few more dollars.
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