Compare phones
| Global Score | |
| 98.1 | 74.6 |
| Basic Information | |
| Samsung | Samsung |
| Android 11 | Android 8.0 Oreo |
| 2021-01-29 | -- |
| 6.50 x 2.98 x 0.35 inches | 6.04 x 3.04 x 0.32 inches |
| 8.04 ounces | 6.14 ounces |
| Phantom black and Silver | 16 777 216 |
| Aluminum and Glass (Corning Gorilla Glass Victus) | Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 966.00 | -- |
| Display / Screen | |
| 6.8 inches | 5.5 inches |
| 3200 x 1440 pixels | 1280 x 720 pixels (HD) |
| Dynamic AMOLED | Super AMOLED |
| 516 pixels per inch | 267 pixels per inch |
| 1500 cd/m2 brightness | -- |
| No touch screen | No touch screen |
| 9.8 | 7.1 |
| Performance | |
| Qualcomm Snapdragon 888 chipset | Samsung Exynos 7 Octa 7884 chipset |
| Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor | ARM Cortex-A53, 64-bit, 14 nm (Octa-Core 1600 MHz) processor |
| 12 GB RAM | 4 GB RAM |
| Adreno 660 GPU | ARM Mali-G71 GPU |
| 9.72 | 8.82 |
| Storage | |
| 128 GB internal memory | 32 GB internal memory |
| No SD card slot | microSDXC (up to 256 GB) external memory slot |
| 10.1 | 8.88 |
| Camera | |
| 108.00 MP + 40.00 MP | 13.00 MP + 8.00 MP |
| f/1.80 aperture | f/1.90 aperture |
| 24.00mm focal length | 27.00mm focal length |
| 0.75 inches (1/1.33") sensor | 0.33 inches (1/3.06") sensor |
| 7680 x 4320 (24 fps) video resolution | 1920 x 1080 (30 fps) (Full HD) video resolution |
| 1280 x 720 (960 fps) (HD) slow motion video | -- |
| 13.75 | 9.02 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | LTE (4G), HSPA and HSUPA |
| Nano SIM | Micro SIM, Dual SIM |
| 10.7 | 6.1 |
| Battery Life | |
| 5000mAh Li - Polymer Battery | 3000mAh Battery |
| Non-Removable Battery | Removable Battery |
| Wireless Charging | -- |
| 6.8 | 4.96 |
| Other Features | |
| Bluetooth 5.1 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | -- |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Light Sensor and Proximity Sensor |
| FM Radio | FM Radio |
Comparison review
The Galaxy S21 Ultra is way better than the Samsung Galaxy J7 Duo, having a 98.1 score against 74.6. Both phones we compare here use Android OS (Operating System), but Galaxy S21 Ultra has the previous 11 version and Samsung Galaxy J7 Duo has Android 8.0 Oreo version. Even being the best in this comparison, the Galaxy S21 Ultra is a just a little thicker and much heavier phone than the Samsung Galaxy J7 Duo.
Galaxy S21 Ultra counts with a faster processing unit than Galaxy J7 Duo, and although they both have a Octa-Core processor, the Galaxy S21 Ultra also has more RAM. Galaxy S21 Ultra counts with a much more vibrant display than Samsung Galaxy J7 Duo, because it has much more pixels per inch in the screen, a lot better resolution of 1440 x 3200px and a larger display.
Galaxy S21 Ultra has more storage capacity to store more apps and games than Galaxy J7 Duo, because although it has no external memory slot, it also counts with more internal storage capacity. The Samsung Galaxy S21 Ultra features a superior battery performance than Galaxy J7 Duo, because it has a 67% greater battery capacity.
Galaxy S21 Ultra takes much clearer photos and videos than Galaxy J7 Duo, because it has a larger aperture to capture better images in low-light environments, a lot higher 7680x4320 video resolution, a back-facing camera with lot more megapixels and a way bigger camera sensor providing a much better image quality.
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