Compare phones
| Global Score | |
| 73.5 | 91.8 |
| Basic Information | |
| Samsung | Samsung |
| Android 9.0 Pie, 7.0 Nougat | Android 11 |
| 2017-07-01 | 2021-01-29 |
| 6.00 x 2.94 x 0.31 inches | 5.97 x 2.80 x 0.31 inches |
| 6.38 ounces | 6.03 ounces |
| Black, Gold, Rose gold and Silver | Gray, Phantom pink, Violet and White |
| Aluminum | Aluminum and Plastic |
| -- | Scratch-Resistant Glass |
| -- | $ 722.00 |
| Display / Screen | |
| 5.5 inches | 6.2 inches |
| 1920 x 1080 pixels (Full HD) | 2400 x 1080 pixels |
| Super AMOLED | Dynamic AMOLED |
| 401 pixels per inch | 424 pixels per inch |
| -- | 1300 cd/m2 brightness |
| No touch screen | No touch screen |
| 7.9 | 9.2 |
| Performance | |
| Samsung Exynos 7 Octa 7870 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 |
| 3 GB RAM | 8 GB RAM |
| Mali-T830 MP2 GPU | Adreno 660 GPU |
| 8.73 | 9.63 |
| Storage | |
| 16 GB internal memory | 128 GB internal memory |
| microSDXC (up to 256 GB) external memory slot | No SD card slot |
| 7.48 | 10.1 |
| Camera | |
| 13.00 MP + 13.00 MP | 12.00 MP + 10.00 MP |
| f/1.70 aperture | f/1.80 aperture |
| -- | 26.00mm focal length |
| -- | 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-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM, Dual SIM | Nano SIM |
| 6.7 | 10.7 |
| Battery Life | |
| 3600mAh Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| -- | Wireless Charging |
| 5.6 | 5.92 |
| Other Features | |
| Bluetooth 4.1 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | NFC |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Compass, Gyroscope, 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 much better than Samsung Galaxy J7 (2017), getting a overall score of 91.8 against 73.5. The Samsung Galaxy S21 construction has the same thickness than the Samsung Galaxy J7 (2017), but it's a bit lighter. Both devices in this comparison review have Android OS (operating system), but the Samsung Galaxy S21 has the older 11 version and Samsung Galaxy J7 (2017) has Android 9.0 Pie.
The Galaxy S21 has a better screen than Galaxy J7 (2017), because it has a slightly higher resolution of 1080 x 2400px, a quite bigger display and a just a bit more pixels per inch of screen. The Samsung Galaxy S21 features a way bigger memory capacity to install applications and games than Galaxy J7 (2017), because although it has no SD extension slot, it also counts with more internal storage capacity.
Galaxy S21 features a quite superior performance than Galaxy J7 (2017), and although they both have the same number of cores, the Galaxy S21 also has a higher amount of RAM memory. Samsung Galaxy S21 counts with a much better camera than Galaxy J7 (2017), because although it has a camera with a lower resolution and a tinier aperture which is not good for taking photos or videos in low light situations, it also counts with a much better video quality.
Galaxy S21 features a bit longer battery lifetime than Samsung Galaxy J7 (2017), because it has an 11 percent bigger battery size.
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