Compare phones
| Global Score | |
| 84.1 | 79.8 |
| Basic Information | |
| Samsung | Samsung |
| Android 11, 10 | Android 11, 10, 9.0 Pie |
| 2020-03-23 | 2019-09-20 |
| 6.26 x 2.96 x 0.35 inches | 6.24 x 2.94 x 0.30 inches |
| 6.63 ounces | 5.86 ounces |
| Midnight blue and Raven black | Prism crush black, Prism crush green, Prism crush violet and Prism crush white |
| Plastic and Plastic | -- |
| Scratch-Resistant Glass | -- |
| Display / Screen | |
| 6.4 inches | 6.4 inches |
| 2340 x 1080 pixels | 1560 x 720 pixels |
| Super AMOLED | Super AMOLED |
| 403 pixels per inch | 268 pixels per inch |
| 420 cd/m2 brightness | -- |
| No touch screen | No touch screen |
| 8.4 | 7.2 |
| Performance | |
| Exynos 9611 chipset | Samsung Exynos 7 Octa 7885 chipset |
| Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor | ARM Cortex-A73 and ARM Cortex-A53, 64-bit, 14 nm (Octa-Core 1800 MHz) processor |
| 4 GB RAM | 4 GB RAM |
| Mali-G72 MP3 GPU | Mali-G71 MP2 GPU |
| 9.27 | 8.91 |
| Storage | |
| 64 GB internal memory | 128 GB internal memory |
| microSDXC (up to 512 GB) external memory slot | microSDXC (up to 512 GB) external memory slot |
| 11.74 | 14.14 |
| Camera | |
| 48.00 MP + 20.00 MP | 25.00 MP + 16.00 MP |
| f/2.00 aperture | f/1.70 aperture |
| 26.00mm focal length | 27.00mm focal length |
| 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 | -- |
| 11.55 | 9.68 |
| 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 HSUPA |
| Nano SIM, Dual SIM | Nano SIM |
| 6.7 | 6.7 |
| 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 5.0 |
| GPS | GPS |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Gyroscope and Proximity Sensor | Accelerometer, Compass, Light Sensor and Proximity Sensor |
| FM Radio | -- |
Comparison review
The Galaxy M21 has a global score of 84.1, which is just a bit better than the Galaxy A30s's global score of 79.8. Although it's the best cellphone in our current comparison, Galaxy M21 is a somewhat heavier and thicker cellphone than the Galaxy A30s. Both phones in our current comparison come with the same Android 11 OS.
The Galaxy M21 counts with a bit superior CPU than Galaxy A30s. Both have the same RAM amount and 8 cores. Galaxy M21 features a better display than Galaxy A30s, and although they both have a same size display, the Galaxy M21 also has a much better resolution of 1080 x 2340 and a way greater quantity of pixels per screen inch.
Galaxy A30s features a very superior memory to install applications and games than Samsung Galaxy M21, and although they both have a slot for SD memory cards that admits a maximum of 512 GB, the Galaxy A30s also has 128 GB internal memory capacity. Galaxy M21 has a superior camera than Galaxy A30s, because although it has a tinier aperture which is not so good for shooting images and/or video in low light situations, it also counts with a back camera with a lot higher 48 megapixels resolution and a lot higher video definition.
The Galaxy M21 features a superior battery duration than Galaxy A30s, because it has a 6000mAh battery capacity.
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