Compare phones
| Global Score | |
| 83.2 | 76.7 |
| Basic Information | |
| Xiaomi | Xiaomi |
| -- | Android 11 |
| 2019-03-06 | 2021-05-27 |
| 6.20 x 2.94 x 0.30 inches | 6.23 x 2.96 x 0.33 inches |
| 6.10 ounces | 6.70 ounces |
| Black, Blue and Purple | Moonlight White, Neptune Blue and Space Black, |
| Glass (Corning Gorilla Glass 5) and Metal | Glass and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| Display / Screen | |
| 6.4 inches | 6.3 inches |
| 2340 x 1080 pixels | 2340 x 1080 pixels |
| AMOLED | IPS LCD |
| 403 pixels per inch | 409 pixels per inch |
| 600 cd/m2 brightness | -- |
| No touch screen | No touch screen |
| 8.6 | 8.1 |
| Performance | |
| Qualcomm Snapdragon 855 chipset | MediaTek Helio G85 MT6769Z chipset |
| Kryo 485, 64-bit, 7 nm (Octa-Core 2840 MHz) processor | Cortex-A75, 64-bit, 12 nm (Octa-Core 2000 MHz) processor |
| 6 GB RAM | 4 GB RAM |
| Adreno 640 GPU | Mali G52 MC2 GPU |
| 9.63 | 9.09 |
| Storage | |
| 128 GB internal memory | 64 GB internal memory |
| No SD card slot | microSDXC (up to 128 GB) external memory slot |
| 10.1 | 10.02 |
| Camera | |
| 48.00 MP + 20.00 MP | 48.00 MP + 13.00 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 |
| 3840 x 2160 (60 fps) (4K) video resolution | 1920 x 1080 (30 fps) (Full HD) video resolution |
| 1920 x 1080 (960 fps) (Full HD) slow motion video | 1280 x 720 (120 fps) (HD) slow motion video |
| 12.1 | 11 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE-A (4G), LTE (4G), HSPA and HSUPA | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSPA |
| Nano SIM, Dual SIM | Nano SIM |
| 6.3 | 6.6 |
| Battery Life | |
| 3300mAh Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | -- |
| 5.28 | 5.92 |
| Other Features | |
| Bluetooth 5.0 | Bluetooth 5.2 |
| 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 has a global score of 83.2, which is just a bit better than Xiaomi Redmi Note 8 2021's global score of 76.7. The Xiaomi Mi 9 construction is just a bit thinner and a bit lighter than Xiaomi Redmi Note 8 2021, even though it was released many years before. The Xiaomi Mi 9 features a bit more powerful processor than Xiaomi Redmi Note 8 2021, and although they both have a Octa-Core processing unit, the Xiaomi Mi 9 also has a greater amount of RAM memory.
Xiaomi Mi 9 features a bit more vivid display than Xiaomi Redmi Note 8 2021, because although it has a bit worse display pixel density, and they both have exactly the same 1080 x 2340 resolution, the Xiaomi Mi 9 also counts with a bit larger display. The Xiaomi Mi 9 counts with just a bit bigger memory capacity to install games and applications than Xiaomi Redmi Note 8 2021, because although it has no SD memory slot, it also counts with 128 GB internal memory capacity.
Xiaomi Redmi Note 8 2021 features longer battery performance than Xiaomi Mi 9, because it has 4000mAh of battery capacity instead of 3300mAh. The Xiaomi Mi 9 captures much better videos and photos than Xiaomi Redmi Note 8 2021, and although they both have a 48 MP resolution back-facing camera, a same size aperture and the same back-facing camera sensor size, the Xiaomi Mi 9 also has a much higher video definition.
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