Compare phones
| Global Score | |
| 84.1 | 76.7 |
| Basic Information | |
| Samsung | Samsung |
| Android 11, 10 | Android 10, 8.0 Oreo |
| 2020-03-23 | 2018-06-28 |
| 6.26 x 2.96 x 0.35 inches | 6.27 x 2.98 x 0.32 inches |
| 6.63 ounces | 6.24 ounces |
| Midnight blue and Raven black | Black, Blue, Gold and Pink |
| Plastic and Plastic | Plastic |
| Scratch-Resistant Glass | -- |
| Display / Screen | |
| 6.4 inches | 6 inches |
| 2340 x 1080 pixels | 1480 x 720 pixels |
| Super AMOLED | Super AMOLED |
| 403 pixels per inch | 274 pixels per inch |
| 420 cd/m2 brightness | -- |
| No touch screen | No touch screen |
| 8.4 | 7.2 |
| Performance | |
| Exynos 9611 chipset | Qualcomm Snapdragon 450 SDM450 chipset |
| Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor | ARM Cortex-A53, 64-bit, 14 nm (Octa-Core 1800 MHz) processor |
| 4 GB RAM | 4 GB RAM |
| Mali-G72 MP3 GPU | Adreno 506 GPU |
| 9.27 | 8.91 |
| Storage | |
| 64 GB internal memory | 64 GB internal memory |
| microSDXC (up to 512 GB) external memory slot | microSDXC (up to 256 GB) external memory slot |
| 11.74 | 10.78 |
| Camera | |
| 48.00 MP + 20.00 MP | 16.00 MP + 16.00 MP |
| f/2.00 aperture | f/1.70 aperture |
| 26.00mm focal length | 26.00mm focal length |
| 0.5 inches (1/2") sensor | 0.36 inches (1/2.8") 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 | 9.46 |
| 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 and HSUPA |
| Nano SIM, Dual SIM | Nano SIM, Dual SIM |
| 6.7 | 6.3 |
| Battery Life | |
| 6000mAh Li - Polymer Battery | 3500mAh Battery |
| Non-Removable Battery | Non-Removable Battery |
| 7.52 | 5.44 |
| Other Features | |
| Bluetooth 5.0 | Bluetooth 4.2 |
| GPS | GPS |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Gyroscope and Proximity Sensor | Accelerometer and Proximity Sensor |
| FM Radio | FM Radio |
Comparison review
The Samsung Galaxy M21 is just a bit better than the Samsung Galaxy J8, getting an 84.1 score against 76.7. Samsung Galaxy M21's design is newer, but a bit heavier and a little bit thicker than the Samsung Galaxy J8. Both devices in our current comparison have Android OS (Operating System), but the Samsung Galaxy M21 has a more recent 11 version while Samsung Galaxy J8 has Android 10, so it provides you a lot of extra features and enhanced performance.
The Samsung Galaxy M21 counts with a more vivid screen than Samsung Galaxy J8, because it has a much better resolution of 1080 x 2340px, a little bigger display and a higher amount of pixels per display inch. Galaxy M21 has a slightly bigger storage for games and applications than Galaxy J8, and although they both have the same 64 GB internal storage capacity, the Galaxy M21 also has a slot for an external memory card that admits up to 512 GB.
Galaxy M21 features a bit better hardware performance than Samsung Galaxy J8. They have a Octa-Core processor and 4 GB of RAM. The Samsung Galaxy M21 features a really longer battery lifetime than Samsung Galaxy J8, because it has 6000mAh of battery capacity. Galaxy M21 captures way better pictures and videos than Galaxy J8, because although it has a smaller camera aperture, it also counts with a back facing camera with a lot better resolution, a lot higher 3840x2160 video quality and a lot bigger sensor which offers a much better image and video quality.
Disclaimer: As an Amazon Associate I earn from qualifying purchases.