Compare phones
| Global Score | |
| 74.6 | 76.1 |
| Basic Information | |
| Samsung | Samsung |
| Android 8.0 Oreo | Android 10 |
| -- | 2020-06-29 |
| 6.04 x 3.04 x 0.32 inches | 6.61 x 3.02 x 0.32 inches |
| 6.14 ounces | 6.81 ounces |
| 16 777 216 | Black |
| Plastic | Plastic and Plastic |
| Scratch-Resistant Glass | -- |
| -- | $ 194.00 |
| Display / Screen | |
| 5.5 inches | 6.5 inches |
| 1280 x 720 pixels (HD) | 1600 x 720 pixels |
| Super AMOLED | IPS LCD |
| 267 pixels per inch | 270 pixels per inch |
| No touch screen | No touch screen |
| 7.1 | 7.3 |
| Performance | |
| Samsung Exynos 7 Octa 7884 chipset | Mediatek Helio P35 chipset |
| ARM Cortex-A53, 64-bit, 14 nm (Octa-Core 1600 MHz) processor | Arm Cortex-A53, 64-bit, 12 nm (Octa-Core 2300 MHz) processor |
| 4 GB RAM | 3 GB RAM |
| ARM Mali-G71 GPU | PowerVR GE8320 GPU |
| 8.82 | 9.27 |
| Storage | |
| 32 GB internal memory | 32 GB internal memory |
| microSDXC (up to 256 GB) external memory slot | microSDXC (up to 512 GB) external memory slot |
| 8.88 | 9.84 |
| Camera | |
| 13.00 MP + 8.00 MP | 16.00 MP + 13.00 MP |
| f/1.90 aperture | f/1.80 aperture |
| 27.00mm focal length | -- |
| 0.33 inches (1/3.06") sensor | 0.33 inches (1/3.06") sensor |
| 1920 x 1080 (30 fps) (Full HD) video resolution | 1920 x 1080 (30 fps) (Full HD) video resolution |
| 9.02 | 9.35 |
| 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 |
| 6.1 | 6.7 |
| Battery Life | |
| 3000mAh Battery | 4000mAh Li - Polymer Battery |
| Removable Battery | Non-Removable Battery |
| 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, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | FM Radio |
Comparison review
The Samsung Galaxy A21 is slightly better than the Galaxy J7 Duo, getting a 76.1 score against 74.6. Both phones in this comparison work with Android operating system, but the Samsung Galaxy A21 has older 10 version and Galaxy J7 Duo has Android 8.0 Oreo. The Samsung Galaxy A21 is a a bit heavier phone than Galaxy J7 Duo, but they are equally thin.
Galaxy A21 has a bit faster processing unit than Samsung Galaxy J7 Duo, although it has 1 GB less RAM, they both have the same number of cores. The Galaxy A21 has a little more vivid display than Samsung Galaxy J7 Duo, because it has a just a bit greater pixels quantity per inch of screen, a larger display and a slightly better 720 x 1600 resolution.
The Galaxy A21 counts with more memory to store more apps and games than Galaxy J7 Duo, and although they both have exactly the same internal storage capacity, the Galaxy A21 also has an external memory card slot that admits a maximum of 512 GB. Samsung Galaxy A21 takes clearer videos and photos than Samsung Galaxy J7 Duo, and although they both have the same (Full HD) video resolution, the same video frame rates and a 0.33 inches camera sensor, the Samsung Galaxy A21 also has a camera with a higher 16 mega-pixels resolution and a larger aperture.
Galaxy A21 features superior battery duration than Galaxy J7 Duo, because it has a 4000mAh battery size against 3000mAh.
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