Compare phones
| Global Score | |
| 76.7 | 83.2 |
| Basic Information | |
| Xiaomi | Xiaomi |
| Android 11 | -- |
| 2021-05-27 | 2019-03-06 |
| 6.23 x 2.96 x 0.33 inches | 6.20 x 2.94 x 0.30 inches |
| 6.70 ounces | 6.10 ounces |
| Moonlight White, Neptune Blue and Space Black, | Black, Blue and Purple |
| Glass and Plastic | Glass (Corning Gorilla Glass 5) and Metal |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| Display / Screen | |
| 6.3 inches | 6.4 inches |
| 2340 x 1080 pixels | 2340 x 1080 pixels |
| IPS LCD | AMOLED |
| 409 pixels per inch | 403 pixels per inch |
| -- | 600 cd/m2 brightness |
| No touch screen | No touch screen |
| 8.1 | 8.6 |
| Performance | |
| MediaTek Helio G85 MT6769Z chipset | Qualcomm Snapdragon 855 chipset |
| Cortex-A75, 64-bit, 12 nm (Octa-Core 2000 MHz) processor | Kryo 485, 64-bit, 7 nm (Octa-Core 2840 MHz) processor |
| 4 GB RAM | 6 GB RAM |
| Mali G52 MC2 GPU | Adreno 640 GPU |
| 9.09 | 9.63 |
| Storage | |
| 64 GB internal memory | 128 GB internal memory |
| microSDXC (up to 128 GB) external memory slot | No SD card slot |
| 10.02 | 10.1 |
| Camera | |
| 48.00 MP + 13.00 MP | 48.00 MP + 20.00 MP |
| f/1.80 aperture | f/1.80 aperture |
| -- | 26.00mm focal length |
| 0.5 inches (1/2") sensor | 0.5 inches (1/2") sensor |
| 1920 x 1080 (30 fps) (Full HD) video resolution | 3840 x 2160 (60 fps) (4K) video resolution |
| 1280 x 720 (120 fps) (HD) slow motion video | 1920 x 1080 (960 fps) (Full HD) slow motion video |
| 11 | 12.1 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSPA | LTE-A (4G), LTE (4G), HSPA and HSUPA |
| Nano SIM | Nano SIM, Dual SIM |
| 6.6 | 6.3 |
| Battery Life | |
| 4000mAh Li - Polymer Battery | 3300mAh Battery |
| Non-Removable Battery | Non-Removable Battery |
| -- | Wireless Charging |
| 5.92 | 5.28 |
| Other Features | |
| Bluetooth 5.2 | Bluetooth 5.0 |
| GPS | GPS |
| -- | NFC |
| Infra-red port | Infra-red port |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
Comparison review
Xiaomi Mi 9 is a little bit better than Xiaomi Redmi Note 8 2021, getting an 83.2 score against 76.7. The Xiaomi Mi 9 is an much older phone than Xiaomi Redmi Note 8 2021, but it's just a little thinner and a little lighter anyway. The Xiaomi Mi 9 has a bit more powerful CPU than Xiaomi Redmi Note 8 2021, and although they both have the same number of cores, the Xiaomi Mi 9 also has a greater amount of RAM.
The Xiaomi Mi 9 features a little more vivid display than Xiaomi Redmi Note 8 2021, because although it has a just a little lower pixel amount in each inch in the display, and they both have the same resolution of 1080 x 2340px, the Xiaomi Mi 9 also counts with a quite bigger screen. The Xiaomi Mi 9 features a little bit more memory capacity for games and applications than Xiaomi Redmi Note 8 2021, because although it has no SD memory card expansion slot, it also counts with 128 GB internal storage capacity.
The Xiaomi Mi 9 features a superior camera than Xiaomi Redmi Note 8 2021, and although they both have a 48 mega pixels camera in the back, a same size aperture and a 0.5 inches sensor, the Xiaomi Mi 9 also has a much better (4K) video quality. The Xiaomi Redmi Note 8 2021 features improved battery duration than Xiaomi Mi 9, because it has 4000mAh of battery capacity.
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