Compare phones
| Global Score | |
| 74.6 | 88 |
| Basic Information | |
| Samsung | Samsung |
| Android 8.0 Oreo | Android 11, 10 |
| -- | 2020-08-06 |
| 6.04 x 3.04 x 0.32 inches | 6.27 x 2.93 x 0.37 inches |
| 6.14 ounces | 7.16 ounces |
| 16 777 216 | Mirage black and Mirage blue |
| Plastic | -- |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| Display / Screen | |
| 5.5 inches | 6.5 inches |
| 1280 x 720 pixels (HD) | 2400 x 1080 pixels |
| Super AMOLED | Super AMOLED |
| 267 pixels per inch | 405 pixels per inch |
| No touch screen | No touch screen |
| 7.1 | 8.1 |
| Performance | |
| Samsung Exynos 7 Octa 7884 chipset | Samsung 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 | 128 GB internal memory |
| microSDXC (up to 256 GB) external memory slot | microSDXC (up to 512 GB) external memory slot |
| 8.88 | 14.14 |
| 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 |
| -- | 1280 x 720 (480 fps) (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 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 M31s has a general score of 88, which is better than Galaxy J7 Duo's global score of 74.6. Both of these devices use Android OS (operating system), but the Samsung Galaxy M31s has an older 11 version and Galaxy J7 Duo has Android 8.0 Oreo. Samsung Galaxy M31s is a somewhat heavier and thicker device than the Galaxy J7 Duo.
Galaxy M31s features a sharper screen than Galaxy J7 Duo, because it has a way higher display pixel density, a bigger screen and a much higher resolution of 1080 x 2400px. Galaxy M31s has a much greater memory capacity for games and applications than Samsung Galaxy J7 Duo, because it has a SD extension slot that holds a maximum of 512 GB and more internal memory.
The Samsung Galaxy M31s features a bit superior CPU than Samsung Galaxy J7 Duo, and although they both have the same number of cores, the Samsung Galaxy M31s also has more RAM memory. The Samsung Galaxy M31s features a much longer battery performance than Samsung Galaxy J7 Duo, because it has a 6000mAh battery capacity.
The Galaxy M31s shoots greater pictures and videos than Galaxy J7 Duo, because it has a lot higher video definition, a way more megapixels camera, a much bigger back camera sensor providing a way better image quality and a bigger camera aperture.
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