Compare phones
| Global Score | |
| 11.67 | 8.97 |
| Basic Information | |
| Samsung | Xiaomi |
| Android 11 | Android 9.0 Pie, 8.1 Oreo, 8.0 Oreo, 7.1 Nougat |
| 2021-01-29 | 2017-09-12 |
| 6.50 x 2.98 x 0.35 inches | 6.12 x 2.98 x 0.29 inches |
| 8.04 ounces | 5.82 ounces |
| Phantom black and Silver | Black, Gold and Pink |
| Aluminum and Glass (Corning Gorilla Glass Victus) | Metal |
| Scratch-Resistant Glass | -- |
| $ 966.00 | -- |
| Display / Screen | |
| 6.8 inches | 5.5 inches |
| 3200 x 1440 pixels | 1920 x 1080 pixels (Full HD) |
| Dynamic AMOLED | IPS LCD |
| 516 pixels per inch | 401 pixels per inch |
| 1500 cd/m2 brightness | 450 cd/m2 brightness |
| No touch screen | No touch screen |
| 9.8 | 8.4 |
| Performance | |
| Qualcomm Snapdragon 888 chipset | Qualcomm Snapdragon 625 8953 chipset |
| Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor | ARM Cortex-A53, 64-bit, 14 nm (Octa-Core 2000 MHz) processor |
| 12 GB RAM | 4 GB RAM |
| Adreno 660 GPU | Adreno 506 GPU |
| 9.72 | 9.09 |
| Storage | |
| 128 GB internal memory | 64 GB internal memory |
| No SD card slot | microSDXC (up to 256 GB) external memory slot |
| 10.1 | 10.78 |
| Camera | |
| 108.00 MP + 40.00 MP | 12.00 MP + 5.00 MP |
| f/1.80 aperture | f/2.20 aperture |
| 24.00mm focal length | 26.00mm focal length |
| 0.75 inches (1/1.33") 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 | 1280 x 720 (120 fps) (HD) slow motion video |
| 13.75 | 9.35 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | LTE (4G), HSPA and HSUPA |
| Nano SIM | Nano SIM |
| 10.7 | 6.1 |
| Battery Life | |
| 5000mAh Li - Polymer Battery | 3080mAh Li - Ion Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | -- |
| 4.96 | 4.48 |
| Other Features | |
| Bluetooth 5.1 | Bluetooth 4.2 |
| GPS | GPS |
| NFC | -- |
| -- | Infra-red port |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | FM Radio |
Comparison review
The Samsung Galaxy S21 Ultra is way better than the Xiaomi Mi A1, having a general score of 11.67 against 8.97. Both phones in our current comparison come with Android OS (Operating System), but the Samsung Galaxy S21 Ultra has an older 11 version and Xiaomi Mi A1 has Android 9.0 Pie version. Samsung Galaxy S21 Ultra's design is much newer than the Xiaomi Mi A1's, although it is somewhat thicker and a lot heavier.
The Samsung Galaxy S21 Ultra counts with a bit faster processing unit than Xiaomi Mi A1, and although they both have the same number of cores, the Samsung Galaxy S21 Ultra also has 8 GB more RAM memory. Galaxy S21 Ultra features a more vivid screen than Xiaomi Mi A1, because it has a bigger screen, a way better 1440 x 3200 resolution, way more brightness and more pixels per inch of display.
Galaxy S21 Ultra counts with a lot better camera than Xiaomi Mi A1, because it has a bigger camera aperture, a way higher 108 megapixels resolution camera and a way higher video definition. Xiaomi Mi A1 features a bit more storage capacity for apps and games than Samsung Galaxy S21 Ultra, because although it has 0 less internal memory capacity, it also counts with a SD memory card expansion slot that supports a maximum of 256 GB.
The Samsung Galaxy S21 Ultra features improved battery performance than Xiaomi Mi A1, because it has a 5000mAh battery size.