Compare phones
| Global Score | |
| 74.6 | 91.8 |
| Basic Information | |
| Samsung | Samsung |
| Android 8.0 Oreo | Android 11 |
| -- | 2021-01-29 |
| 6.04 x 3.04 x 0.32 inches | 5.97 x 2.80 x 0.31 inches |
| 6.14 ounces | 6.03 ounces |
| 16 777 216 | Gray, Phantom pink, Violet and White |
| Plastic | Aluminum and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| -- | $ 722.00 |
| Display / Screen | |
| 5.5 inches | 6.2 inches |
| 1280 x 720 pixels (HD) | 2400 x 1080 pixels |
| Super AMOLED | Dynamic AMOLED |
| 267 pixels per inch | 424 pixels per inch |
| -- | 1300 cd/m2 brightness |
| No touch screen | No touch screen |
| 7.1 | 9.2 |
| Performance | |
| Samsung Exynos 7 Octa 7884 chipset | Qualcomm Snapdragon 888 chipset |
| ARM Cortex-A53, 64-bit, 14 nm (Octa-Core 1600 MHz) processor | Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor |
| 4 GB RAM | 8 GB RAM |
| ARM Mali-G71 GPU | Adreno 660 GPU |
| 8.82 | 9.63 |
| Storage | |
| 32 GB internal memory | 128 GB internal memory |
| microSDXC (up to 256 GB) external memory slot | No SD card slot |
| 8.88 | 10.1 |
| Camera | |
| 13.00 MP + 8.00 MP | 12.00 MP + 10.00 MP |
| f/1.90 aperture | f/1.80 aperture |
| 27.00mm focal length | 26.00mm focal length |
| 0.33 inches (1/3.06") sensor | 0.57 inches (1/1.76") sensor |
| 1920 x 1080 (30 fps) (Full HD) video resolution | 7680 x 4320 (24 fps) video resolution |
| -- | 1280 x 720 (960 fps) (HD) slow motion video |
| 9.02 | 10.78 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE (4G), HSPA and HSUPA | 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Micro SIM, Dual SIM | Nano SIM |
| 6.1 | 10.7 |
| Battery Life | |
| 3000mAh Battery | 4000mAh Li - Polymer Battery |
| Removable Battery | Non-Removable Battery |
| -- | Wireless Charging |
| 4.96 | 5.92 |
| Other Features | |
| Bluetooth 5.0 | Bluetooth 5.0 |
| GPS | GPS |
| -- | NFC |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Light Sensor and Proximity Sensor | Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | FM Radio |
Comparison review
The Samsung Galaxy S21 is way better than Galaxy J7 Duo, getting a 91.8 score against 74.6. Both devices in this comparison review come with Android OS (operating system), but the Samsung Galaxy S21 has older 11 version and Galaxy J7 Duo has Android 8.0 Oreo version. The Samsung Galaxy S21 design is just a little lighter and just a bit thinner than Galaxy J7 Duo.
Galaxy S21 has a much more vibrant display than Samsung Galaxy J7 Duo, because it has a lot higher pixels amount per inch in the display, a bit bigger screen and a lot higher 1080 x 2400 resolution. Galaxy S21 has a little bit better hardware performance than Samsung Galaxy J7 Duo, and although they both have a Octa-Core processing unit, the Galaxy S21 also has a higher amount of RAM memory.
The Samsung Galaxy S21 has more memory capacity to store more apps and games than Samsung Galaxy J7 Duo, because although it has no SD extension slot, it also counts with 128 GB internal memory. Galaxy S21 has longer battery performance than Samsung Galaxy J7 Duo, because it has 4000mAh of battery capacity against 3000mAh.
Galaxy S21 features a much better camera than Galaxy J7 Duo, because although it has a worse 12 mega pixels resolution back-facing camera, it also counts with a way bigger back-facing camera sensor capturing more light and vivid colors, a larger aperture and a lot better video definition.
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