Compare phones
| Global Score | |
| 72.5 | 84.1 |
| Basic Information | |
| Samsung | Samsung |
| -- | Android 11, 10 |
| 2018-07-13 | 2020-03-23 |
| 6.03 x 3.00 x 0.34 inches | 6.26 x 2.96 x 0.35 inches |
| 6.38 ounces | 6.63 ounces |
| Black | Midnight blue and Raven black |
| Plastic | Plastic and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 230.00 | -- |
| Display / Screen | |
| 5.5 inches | 6.4 inches |
| 1280 x 720 pixels (HD) | 2340 x 1080 pixels |
| TFT | Super AMOLED |
| 267 pixels per inch | 403 pixels per inch |
| -- | 420 cd/m2 brightness |
| No touch screen | No touch screen |
| 7.1 | 8.4 |
| Performance | |
| Samsung Exynos 7 Octa 7870 chipset | Exynos 9611 chipset |
| ARM Cortex-A53, 64-bit, 14 nm (Octa-Core 1600 MHz) processor | Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor |
| 2 GB RAM | 4 GB RAM |
| Mali-T830 MP1 GPU | Mali-G72 MP3 GPU |
| 8.73 | 9.27 |
| Storage | |
| 32 GB internal memory | 64 GB internal memory |
| microSDXC (up to 400 GB) external memory slot | microSDXC (up to 512 GB) external memory slot |
| 9.44 | 11.74 |
| Camera | |
| 13.00 MP + 13.00 MP | 48.00 MP + 20.00 MP |
| f/1.70 aperture | f/2.00 aperture |
| 28.00mm focal length | 26.00mm focal length |
| 0.33 inches (1/3.06") sensor | 0.5 inches (1/2") sensor |
| 1920 x 1080 (30 fps) (Full HD) video resolution | 3840 x 2160 (30 fps) (4K) video resolution |
| -- | 1920 x 1080 (240 fps) (Full HD) slow motion video |
| 9.13 | 11.55 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE (4G), HSPA and HSUPA | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM | Nano SIM, Dual SIM |
| 6.1 | 6.7 |
| Battery Life | |
| 3300mAh Battery | 6000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| 5.28 | 7.52 |
| Other Features | |
| Bluetooth 4.2 | Bluetooth 5.0 |
| GPS | GPS |
| -- | Fingerprint ID Scanner |
| Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Gyroscope and Proximity Sensor |
| -- | FM Radio |
Comparison review
The Galaxy M21 is much better than the Samsung Galaxy J7 (2018), getting a global score of 84.1 against 72.5. Galaxy M21's body is newer than the Samsung Galaxy J7 (2018)'s, but it is just a little heavier and a little thicker. The Galaxy M21 features a more vivid screen than Galaxy J7 (2018), because it has a larger screen, a way higher 1080 x 2340 resolution and a much higher count of pixels per inch of screen.
The Samsung Galaxy M21 features a superior storage capacity to install games and applications than Galaxy J7 (2018), because it has more internal storage capacity and a SD memory card expansion slot that allows up to 512 GB. Galaxy M21 has a bit better hardware performance than Samsung Galaxy J7 (2018), and although they both have a Octa-Core CPU, the Galaxy M21 also has a greater amount of RAM memory.
The Galaxy M21 has a superior battery lifetime than Samsung Galaxy J7 (2018), because it has a 6000mAh battery size against 3300mAh. Galaxy M21 counts with a much better camera than Samsung Galaxy J7 (2018), because although it has a tinier aperture which is not favorable for capturing pictures and videos in poorly lited situations, it also counts with a camera in the back with a much better 48 mega pixels resolution, a much larger back camera sensor which provides a much better photo and video quality and a lot better (4K) video definition.
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