Compare phones
| Global Score | |
| 98.1 | 80.6 |
| Basic Information | |
| Samsung | Xiaomi |
| Android 11 | Android 14 |
| 2021-01-29 | 2024-10-29 |
| 6.50 x 2.98 x 0.35 inches | 6.00 x 2.80 x 0.32 inches |
| 8.04 ounces | 6.67 ounces |
| Phantom black and Silver | -- |
| Aluminum and Glass (Corning Gorilla Glass Victus) | Glass |
| Scratch-Resistant Glass | -- |
| $ 966.00 | -- |
| Display / Screen | |
| 6.8 inches | 6.4 inches |
| 3200 x 1440 pixels | 2670 x 1200 pixels |
| Dynamic AMOLED | OLED |
| 516 pixels per inch | 457 pixels per inch |
| 1500 cd/m2 brightness | 3200 cd/m2 brightness |
| No touch screen | No touch screen |
| 9.8 | 10.2 |
| Performance | |
| Qualcomm Snapdragon 888 chipset | Snapdragon 8 Elite SM8750-AB (3 nm) chipset |
| Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor | processor |
| 12 GB RAM | 12 GB RAM |
| Adreno 660 GPU | Adreno 830 GPU |
| 9.72 | 6.21 |
| Storage | |
| 128 GB internal memory | 256 GB internal memory |
| No SD card slot | No SD card slot |
| 10.1 | 13.3 |
| Camera | |
| 108.00 MP + 40.00 MP | 50.00 MP + 32.00 MP |
| f/1.80 aperture | f/1.60 aperture |
| 24.00mm focal length | 23.00mm 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 (960 fps) (Full HD) slow motion video |
| 13.75 | 12.1 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | 5G, 5G |
| Nano SIM | Nano SIM |
| 10.7 | 7 |
| Battery Life | |
| 5000mAh Li - Polymer Battery | 5400mAh Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | Wireless Charging |
| 6.8 | 7.12 |
| 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 and Gyroscope |
| FM Radio | -- |
Comparison review
The Galaxy S21 Ultra is way better than the Xiaomi 15, getting a global score of 98.1 against 80.6. Both of these devices use Android operating system, but Galaxy S21 Ultra has an older 11 version while Xiaomi 15 has Android 14 version. Despite being the best cellphone in our current comparison, Galaxy S21 Ultra is a older, heavier and just a bit thicker cellphone than the Xiaomi 15.
Xiaomi 15 counts with a little more vivid display than Galaxy S21 Ultra, because although it has a little smaller display, a little lower resolution of 1200 x 2670 and a little bit worse pixel density, it also counts with a way brighter display. The Samsung Galaxy S21 Ultra has a way better hardware performance than Xiaomi 15. Both of them have the same RAM memory amount and 8 cpu cores.
Xiaomi 15 counts with a superior memory capacity for applications and games than Samsung Galaxy S21 Ultra, because it has 128 GB more internal storage capacity. The Galaxy S21 Ultra shoots better photos and videos than Xiaomi 15, because although it has a tinier camera aperture which is not nice for capturing images and videos in low-light situations and lower video frame rate, and they both have the same 7680x4320 video resolution, the Galaxy S21 Ultra also counts with a way better 108 MP resolution camera.
Xiaomi 15 has a bit superior battery duration than Galaxy S21 Ultra, because it has an 8 percent greater battery capacity.
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