Compare phones
| Global Score | |
| 73.1 | 84.1 |
| Basic Information | |
| Samsung | Samsung |
| Android 9.0 Pie, 8.0 Oreo | 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 |
| Blue | Midnight blue and Raven black |
| -- | Plastic and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 107.00 | -- |
| 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+ (4G), HSDPA and HSUPA | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM | Nano SIM, Dual SIM |
| 6.6 | 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 |
| NFC | -- |
| -- | Fingerprint ID Scanner |
| Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Gyroscope and Proximity Sensor |
| -- | FM Radio |
Comparison review
The Samsung Galaxy M21 is better than the Galaxy J7 Star, having a score of 84.1 against 73.1. Both phones we are comparing here use Android operating system, but the Samsung Galaxy M21 has older 11 version and Galaxy J7 Star has Android 9.0 Pie version. Even though Samsung Galaxy M21 is newer than Galaxy J7 Star, it is just a bit thicker and just a bit heavier.
The Samsung Galaxy M21 features a bit better processing power than Galaxy J7 Star, and although they both have 8 cpu cores, the Samsung Galaxy M21 also has a greater amount of RAM. Galaxy M21 has a better looking display than Samsung Galaxy J7 Star, because it has a way better resolution of 1080 x 2340 pixels, a larger screen and a way greater display density.
The Samsung Galaxy M21 counts with a very superior storage for games and applications than Samsung Galaxy J7 Star, because it has an external SD slot that supports a maximum of 512 GB and 64 GB internal storage capacity. Galaxy M21 shoots greater pictures and videos than Samsung Galaxy J7 Star, because although it has a smaller camera aperture, it also counts with a way better (4K) video definition, a much more mega-pixels camera in the back and a lot larger sensor which offers a lot better image and video quality.
Samsung Galaxy M21 counts with a very superior battery lifetime than Galaxy J7 Star, because it has an 82 percent bigger battery size.
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