Compare phones
| Global Score | |
| 72.7 | 84.1 |
| Basic Information | |
| Samsung | Samsung |
| Android 8.0 Oreo | Android 11, 10 |
| 2018-06-29 | 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 |
| 16 777 216 | Midnight blue and Raven black |
| -- | Plastic and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| 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 7884 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-A (4G), LTE (4G), HSPA and HSUPA | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM | Nano SIM, Dual SIM |
| 6.3 | 6.7 |
| Battery Life | |
| 3300mAh Li - Polymer 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 has a score of 84.1, which is much better than the Samsung Galaxy J7 Refine's general score of 72.7. Galaxy M21's design is newer, but a little bit heavier and just a bit thicker than Samsung Galaxy J7 Refine. Both phones in our current comparison work with Android OS, but Galaxy M21 has 11 version while Samsung Galaxy J7 Refine has Android 8.0 Oreo version.
Galaxy M21 has a much better looking display than Samsung Galaxy J7 Refine, because it has a much higher resolution of 1080 x 2340, a lot better pixel density and a bigger screen. The Samsung Galaxy M21 has a way bigger memory to install applications and games than Samsung Galaxy J7 Refine, because it has a SD extension slot that admits a maximum of 512 GB and 32 GB more internal storage capacity.
Samsung Galaxy M21 counts with just a bit better hardware performance than Galaxy J7 Refine, and although they both have 8 CPU cores, the Samsung Galaxy M21 also has a higher amount of RAM memory. The Samsung Galaxy M21 counts with a greater camera than Samsung Galaxy J7 Refine, because although it has a tinier aperture which is not favorable for low light photography and videos, it also counts with a back-facing camera with much more mega pixels, a lot better video quality and a much larger sensor shooting way higher quality videos and photographs.
Samsung Galaxy M21 features a really longer battery lifetime than Galaxy J7 Refine, because it has an 82 percent larger battery capacity.
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