Compare phones
| Global Score | |
| 82.1 | 84.1 |
| Basic Information | |
| Samsung | Samsung |
| Android 9.0 Pie, 8.0 Oreo | Android 11, 10 |
| 2018-08-27 | 2020-03-23 |
| 6.39 x 3.03 x 0.30 inches | 6.26 x 2.96 x 0.35 inches |
| 6.74 ounces | 6.63 ounces |
| Black and White | Midnight blue and Raven black |
| Glass and Metal | Plastic and Plastic |
| -- | Scratch-Resistant Glass |
| Display / Screen | |
| 6.3 inches | 6.4 inches |
| 2220 x 1080 pixels | 2340 x 1080 pixels |
| Super AMOLED | Super AMOLED |
| 392 pixels per inch | 403 pixels per inch |
| -- | 420 cd/m2 brightness |
| No touch screen | No touch screen |
| 8 | 8.4 |
| Performance | |
| Qualcomm Snapdragon 660 SDM660 chipset | Exynos 9611 chipset |
| Kryo 260, 64-bit, 14 nm (Octa-Core 2200 MHz) processor | Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor |
| 6 GB RAM | 4 GB RAM |
| Adreno 512 GPU | Mali-G72 MP3 GPU |
| 9.27 | 9.27 |
| Storage | |
| 64 GB internal memory | 64 GB internal memory |
| microSDXC (up to 400 GB) external memory slot | microSDXC (up to 512 GB) external memory slot |
| 11.34 | 11.74 |
| Camera | |
| 16.00 MP + 24.00 MP | 48.00 MP + 20.00 MP |
| f/1.70 aperture | f/2.00 aperture |
| 26.00mm focal length | 26.00mm focal length |
| 0.36 inches (1/2.8") sensor | 0.5 inches (1/2") sensor |
| 3840 x 2160 (30 fps) (4K) video resolution | 3840 x 2160 (30 fps) (4K) video resolution |
| -- | 1920 x 1080 (240 fps) (Full HD) slow motion video |
| 10.01 | 11.55 |
| 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 | Nano SIM, Dual SIM |
| 6.7 | 6.7 |
| Battery Life | |
| 3700mAh Li - Ion Battery | 6000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| 5.68 | 7.52 |
| Other Features | |
| Bluetooth 5.0 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | -- |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Gyroscope and Proximity Sensor |
| FM Radio | FM Radio |
Comparison review
Samsung Galaxy M21 has an overall score of 84.1, which is a little bit better than Samsung Galaxy A8 Star's 82.1 global score. The Samsung Galaxy M21 is a newer and a little bit lighter cellphone than the Samsung Galaxy A8 Star, but it's thicker. These devices come with Android OS, but the Samsung Galaxy M21 has the older 11 version while Samsung Galaxy A8 Star has Android 9.0 Pie version.
Galaxy M21 has a bit more vivid screen than Galaxy A8 Star, because it has a little bit higher display density, a slightly higher resolution of 1080 x 2340px and a quite larger screen. The Galaxy M21 counts with a little bit better storage to install games and applications than Galaxy A8 Star, and although they both have the same 64 GB internal storage, the Galaxy M21 also has a slot for an SD memory card that admits a maximum of 512 GB.
The Samsung Galaxy A8 Star and the Samsung Galaxy M21 both have extremely similar processing units, and although the Samsung Galaxy M21 has lesser RAM memory, they both have the same number of cores. Samsung Galaxy M21 takes much better photographs and videos than Galaxy A8 Star, because although it has a tinier aperture which is not favorable for capturing photographs and videos in poorly lited situations, and they both have the same video frame rates and the same 3840x2160 video definition, the Samsung Galaxy M21 also counts with a camera in the back with a way higher resolution and a much larger sensor taking more light and vivid colors.
Galaxy M21 features a way better battery life than Galaxy A8 Star, because it has 6000mAh of battery capacity.
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