Compare phones
| Global Score | |
| 74.6 | 86.5 |
| Basic Information | |
| Samsung | Samsung |
| Android 8.0 Oreo | Android 11, 10 |
| -- | 2020-03-05 |
| 6.04 x 3.04 x 0.32 inches | 6.27 x 2.96 x 0.35 inches |
| 6.14 ounces | 6.74 ounces |
| 16 777 216 | Black, Blue and Red |
| Plastic | 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 |
| Super AMOLED | 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 |
| 4 GB RAM | 6 GB RAM |
| ARM Mali-G71 GPU | Mali-G72 MP3 GPU |
| 8.82 | 9.36 |
| Storage | |
| 32 GB internal memory | 64 GB internal memory |
| microSDXC (up to 256 GB) external memory slot | microSDXC (up to 512 GB) external memory slot |
| 8.88 | 11.74 |
| Camera | |
| 13.00 MP + 8.00 MP | 64.00 MP + 32.00 MP |
| f/1.90 aperture | f/1.80 aperture |
| 27.00mm focal length | 26.00mm focal length |
| 0.33 inches (1/3.06") sensor | 0.59 inches (1/1.7") 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 |
| 9.02 | 12.1 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE (4G), HSPA and HSUPA | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Micro SIM, Dual SIM | Nano SIM, Dual SIM |
| 6.1 | 6.7 |
| Battery Life | |
| 3000mAh Battery | 6000mAh Li - Polymer Battery |
| Removable Battery | Non-Removable Battery |
| 4.96 | 7.52 |
| Other Features | |
| Bluetooth 5.0 | Bluetooth 5.0 |
| GPS | GPS |
| -- | NFC |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Light Sensor and Proximity Sensor | Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | FM Radio |
Comparison review
Samsung Galaxy M31 has a global score of 86.5, which is better than Galaxy J7 Duo's 74.6 global score. Both of these phones have Android OS (operating system), but the Samsung Galaxy M31 has older 11 version while Galaxy J7 Duo has Android 8.0 Oreo version. Even being the best in this comparison review, the Samsung Galaxy M31 is a just a little bit heavier and just a little thicker device than the Galaxy J7 Duo.
Galaxy M31 counts with a little better performance than Galaxy J7 Duo, and although they both have a Octa-Core processor, the Galaxy M31 also has a larger amount of RAM. The Samsung Galaxy M31 features a much better display than Samsung Galaxy J7 Duo, because it has a bigger display, way more pixels per display inch and a much better resolution of 1080 x 2340 pixels.
Samsung Galaxy M31 takes a lot better photographs and videos than Galaxy J7 Duo, because it has a lot better (4K) video resolution, a larger aperture to capture better low-light photography and video, a much larger sensor taking more light and vivid colors and a way higher resolution back facing camera.
Samsung Galaxy M31 has a much better memory to store more games and applications than Samsung Galaxy J7 Duo, because it has 64 GB internal storage capacity and an external memory card slot that allows up to 512 GB. The Galaxy M31 features a way better battery lifetime than Samsung Galaxy J7 Duo, because it has a 6000mAh battery capacity.
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