Compare phones
| Global Score | |
| 73.5 | 76.1 |
| Basic Information | |
| Samsung | Samsung |
| Android 9.0 Pie, 7.0 Nougat | Android 10 |
| 2017-07-01 | 2020-06-29 |
| 6.00 x 2.94 x 0.31 inches | 6.61 x 3.02 x 0.32 inches |
| 6.38 ounces | 6.81 ounces |
| Black, Gold, Rose gold and Silver | Black |
| Aluminum | Plastic and Plastic |
| -- | $ 194.00 |
| Display / Screen | |
| 5.5 inches | 6.5 inches |
| 1920 x 1080 pixels (Full HD) | 1600 x 720 pixels |
| Super AMOLED | IPS LCD |
| 401 pixels per inch | 270 pixels per inch |
| No touch screen | No touch screen |
| 7.9 | 7.3 |
| Performance | |
| Samsung Exynos 7 Octa 7870 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 |
| 3 GB RAM | 3 GB RAM |
| Mali-T830 MP2 GPU | PowerVR GE8320 GPU |
| 8.73 | 9.27 |
| Storage | |
| 16 GB internal memory | 32 GB internal memory |
| microSDXC (up to 256 GB) external memory slot | microSDXC (up to 512 GB) external memory slot |
| 7.48 | 9.84 |
| Camera | |
| 13.00 MP + 13.00 MP | 16.00 MP + 13.00 MP |
| f/1.70 aperture | f/1.80 aperture |
| -- | 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-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM, Dual SIM | Nano SIM |
| 6.7 | 6.7 |
| Battery Life | |
| 3600mAh Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| 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, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | FM Radio |
Comparison review
Galaxy A21 is a bit better than Galaxy J7 (2017), with a 76.1 score against 73.5. Galaxy A21's construction is noticeably newer, but a little bit thicker and a bit heavier than Galaxy J7 (2017). These phones work with Android OS, but the Galaxy A21 has the older 10 version while Galaxy J7 (2017) has Android 9.0 Pie.
Samsung Galaxy J7 (2017) counts with a bit better looking screen than Galaxy A21, because although it has a little smaller display, it also counts with a better 1080 x 1920 pixels resolution and a higher pixel density. Samsung Galaxy A21 counts with a bit faster CPU than Galaxy J7 (2017). Both of them have a Octa-Core CPU and a 3 GB RAM.
The Samsung Galaxy A21 has a slightly better camera than Galaxy J7 (2017), because although it has a tinier diafragm aperture, and they both have the same 1920x1080 (Full HD) video resolution and the same 30 fps video frame rate, the Samsung Galaxy A21 also counts with a back camera with a better 16 mega-pixels resolution.
The Galaxy A21 has a much greater memory to store more games and applications than Galaxy J7 (2017), because it has 16 GB more internal storage and a slot for external memory cards that admits a maximum of 512 GB. The Galaxy A21 has a bit longer battery lifetime than Galaxy J7 (2017), because it has an 11 percent greater battery capacity.
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