Compare phones
| Global Score | |
| 98.1 | 80.1 |
| Basic Information | |
| Samsung | Xiaomi |
| Android 11 | Android 15 |
| 2021-01-29 | -- |
| 6.50 x 2.98 x 0.35 inches | -- |
| 8.04 ounces | -- |
| Phantom black and Silver | -- |
| Aluminum and Glass (Corning Gorilla Glass Victus) | -- |
| Scratch-Resistant Glass | -- |
| $ 966.00 | -- |
| Display / Screen | |
| 6.8 inches | 6.7 inches |
| 3200 x 1440 pixels | -- |
| Dynamic AMOLED | AMOLED |
| 516 pixels per inch | -- |
| 1500 cd/m2 brightness | 3000 cd/m2 brightness |
| No touch screen | No touch screen |
| 9.8 | 5 |
| Performance | |
| Qualcomm Snapdragon 888 chipset | Qualcomm Snapdragon 8 Elite SM8750-AB (4 nm) chipset |
| Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor | processor |
| 12 GB RAM | 16 GB RAM |
| Adreno 660 GPU | Adreno 830 GPU |
| 9.72 | 6.3 |
| Storage | |
| 128 GB internal memory | 512 GB internal memory |
| No SD card slot | No SD card slot |
| 10.1 | 17.6 |
| Camera | |
| 108.00 MP + 40.00 MP | 200.00 MP + 32.00 MP |
| f/1.80 aperture | -- |
| 24.00mm focal length | -- |
| 0.75 inches (1/1.33") sensor | -- |
| 7680 x 4320 (24 fps) video resolution | 7680 x 4320 (30 fps) video resolution |
| 1280 x 720 (960 fps) (HD) slow motion video | 1920 x 1080 (1920 fps) (Full HD) slow motion video |
| 13.75 | 12.87 |
| Networks | |
| Wi-Fi | -- |
| Mobile Hotspot | -- |
| 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G) and HSDPA |
| Nano SIM | Nano SIM |
| 10.7 | 7.6 |
| Battery Life | |
| 5000mAh Li - Polymer Battery | 6000mAh Si - Carbon Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | Wireless Charging |
| 6.8 | 7.52 |
| Other Features | |
| Bluetooth 5.1 | Bluetooth 5.4 |
| GPS | GPS |
| NFC | NFC |
| -- | Infra-red port |
| 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
Galaxy S21 Ultra has an overall score of 98.1, which is much better than the Xiaomi 15 Ultra (Rumored)'s general score of 80.1. Both of these phones include Android OS, but Galaxy S21 Ultra has the previous 11 version and Xiaomi 15 Ultra (Rumored) has Android 15 version. Galaxy S21 Ultra counts with a much better looking screen than Xiaomi 15 Ultra (Rumored), because although it has way less brightness, it also counts with a quite larger display.
The Galaxy S21 Ultra counts with an extremely better processor than Xiaomi 15 Ultra (Rumored), although it has 4 GB lesser RAM, they both have the same number of cores. Xiaomi 15 Ultra (Rumored) features a much greater storage for apps and games than Galaxy S21 Ultra, because it has 512 GB internal storage capacity.
Xiaomi 15 Ultra (Rumored) has improved battery duration than Galaxy S21 Ultra, because it has a 6000mAh battery capacity against 5000mAh. The Galaxy S21 Ultra counts with a little bit better camera than Xiaomi 15 Ultra (Rumored), although it has a back camera with a way lower resolution and a worse video definition.
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