Compare phones
| Global Score | |
| 84.1 | 76.7 |
| Basic Information | |
| Samsung | Xiaomi |
| Android 11, 10 | Android 11 |
| 2020-03-23 | 2021-05-27 |
| 6.26 x 2.96 x 0.35 inches | 6.23 x 2.96 x 0.33 inches |
| 6.63 ounces | 6.70 ounces |
| Midnight blue and Raven black | Moonlight White, Neptune Blue and Space Black, |
| Plastic and Plastic | 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 |
| Super AMOLED | IPS LCD |
| 403 pixels per inch | 409 pixels per inch |
| 420 cd/m2 brightness | -- |
| No touch screen | No touch screen |
| 8.4 | 8.1 |
| Performance | |
| Exynos 9611 chipset | MediaTek Helio G85 MT6769Z chipset |
| Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor | Cortex-A75, 64-bit, 12 nm (Octa-Core 2000 MHz) processor |
| 4 GB RAM | 4 GB RAM |
| Mali-G72 MP3 GPU | Mali G52 MC2 GPU |
| 9.27 | 9.09 |
| Storage | |
| 64 GB internal memory | 64 GB internal memory |
| microSDXC (up to 512 GB) external memory slot | microSDXC (up to 128 GB) external memory slot |
| 11.74 | 10.02 |
| Camera | |
| 48.00 MP + 20.00 MP | 48.00 MP + 13.00 MP |
| f/2.00 aperture | f/1.80 aperture |
| 26.00mm focal length | -- |
| 0.5 inches (1/2") sensor | 0.5 inches (1/2") sensor |
| 3840 x 2160 (30 fps) (4K) video resolution | 1920 x 1080 (30 fps) (Full HD) video resolution |
| 1920 x 1080 (240 fps) (Full HD) slow motion video | 1280 x 720 (120 fps) (HD) slow motion video |
| 11.55 | 11 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSPA |
| Nano SIM, Dual SIM | Nano SIM |
| 6.7 | 6.6 |
| Battery Life | |
| 6000mAh Li - Polymer Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| 7.52 | 5.92 |
| Other Features | |
| Bluetooth 5.0 | Bluetooth 5.2 |
| GPS | GPS |
| -- | Infra-red port |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Gyroscope and Proximity Sensor | Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | -- |
Comparison review
The Galaxy M21 has a score of 84.1, which is a bit better than Xiaomi Redmi Note 8 2021's global score of 76.7. Both of these phones include the same Android 11 OS. Although Galaxy M21 is older and a little thicker than the Xiaomi Redmi Note 8 2021, it's body is still a little bit lighter. Samsung Galaxy M21 counts with a bit sharper screen than Xiaomi Redmi Note 8 2021, because although it has a bit worse display density, and they both have the same 1080 x 2340 resolution, the Samsung Galaxy M21 also counts with a little bigger display.
The Galaxy M21 counts with a bit faster CPU than Xiaomi Redmi Note 8 2021. Both of them have a Octa-Core processing unit and the same RAM memory amount. The Samsung Galaxy M21 counts with a greater storage capacity to install applications and games or saving photos and videos than Xiaomi Redmi Note 8 2021, and although they both have the same 64 GB internal memory capacity, the Samsung Galaxy M21 also has an external memory slot that supports a maximum of 512 GB.
Galaxy M21 has a slightly better camera than Xiaomi Redmi Note 8 2021, because although it has a smaller camera aperture, and they both have a same resolution camera in the back and a same size back-facing camera sensor, the Galaxy M21 also counts with a way higher (4K) video resolution. Galaxy M21 features a much longer battery life than Xiaomi Redmi Note 8 2021, because it has 6000mAh of battery capacity instead of 4000mAh.
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