Compare phones
| Global Score | |
| 80.6 | 98.1 |
| Basic Information | |
| Xiaomi | Samsung |
| Android 14 | Android 11 |
| 2024-10-29 | 2021-01-29 |
| 6.00 x 2.80 x 0.32 inches | 6.50 x 2.98 x 0.35 inches |
| 6.67 ounces | 8.04 ounces |
| -- | Phantom black and Silver |
| Glass | Aluminum and Glass (Corning Gorilla Glass Victus) |
| -- | Scratch-Resistant Glass |
| -- | $ 966.00 |
| Display / Screen | |
| 6.4 inches | 6.8 inches |
| 2670 x 1200 pixels | 3200 x 1440 pixels |
| OLED | Dynamic AMOLED |
| 457 pixels per inch | 516 pixels per inch |
| 3200 cd/m2 brightness | 1500 cd/m2 brightness |
| No touch screen | No touch screen |
| 10.2 | 9.8 |
| Performance | |
| Snapdragon 8 Elite SM8750-AB (3 nm) chipset | Qualcomm Snapdragon 888 chipset |
| processor | Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor |
| 12 GB RAM | 12 GB RAM |
| Adreno 830 GPU | Adreno 660 GPU |
| 6.21 | 9.72 |
| Storage | |
| 256 GB internal memory | 128 GB internal memory |
| No SD card slot | No SD card slot |
| 13.3 | 10.1 |
| Camera | |
| 50.00 MP + 32.00 MP | 108.00 MP + 40.00 MP |
| f/1.60 aperture | f/1.80 aperture |
| 23.00mm focal length | 24.00mm focal length |
| -- | 0.75 inches (1/1.33") sensor |
| 7680 x 4320 (30 fps) video resolution | 7680 x 4320 (24 fps) video resolution |
| 1920 x 1080 (960 fps) (Full HD) slow motion video | 1280 x 720 (960 fps) (HD) slow motion video |
| 12.1 | 13.75 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| 5G, 5G | 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM | Nano SIM |
| 7 | 10.7 |
| Battery Life | |
| 5400mAh Battery | 5000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | Wireless Charging |
| 7.12 | 6.8 |
| Other Features | |
| Bluetooth 5.4 | Bluetooth 5.1 |
| GPS | GPS |
| NFC | NFC |
| Infra-red port | -- |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Barometer, Compass and Gyroscope | Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| -- | FM Radio |
Comparison review
Galaxy S21 Ultra is much better than Xiaomi 15, with a overall score of 98.1 against 80.6. Although it's the best phone we compare here, Galaxy S21 Ultra's construction is noticeably older, somewhat heavier and a bit thicker than the Xiaomi 15. These phones include Android OS (Operating System), but Galaxy S21 Ultra has an older 11 version while Xiaomi 15 has Android 14.
Xiaomi 15 counts with a bit more vivid screen than Galaxy S21 Ultra, because although it has a quite lower number of pixels per inch of display, a bit smaller screen and a bit worse 1200 x 2670 pixels resolution, it also counts with much more display brightness. Xiaomi 15 has a much bigger memory to install applications and games than Galaxy S21 Ultra, because it has 256 GB internal storage.
Samsung Galaxy S21 Ultra has a much better performing processing unit than Xiaomi 15. Both of them have 8 cores and 12 GB of RAM memory. The Galaxy S21 Ultra has a superior camera than Xiaomi 15, because although it has worse video frame rate and a smaller diafragm aperture which is not recommended for low-light photos and videos, and they both have the same 7680x4320 video definition, the Galaxy S21 Ultra also counts with a back-facing camera with way more MP.
The Xiaomi 15 counts with a bit longer battery performance than Galaxy S21 Ultra, because it has 5400mAh of battery capacity.
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