Compare phones
| Global Score | |
| 73.1 | 91.8 |
| Basic Information | |
| Samsung | Samsung |
| Android 9.0 Pie, 8.0 Oreo | Android 11 |
| 2018-07-13 | 2021-01-29 |
| 6.03 x 3.00 x 0.34 inches | 5.97 x 2.80 x 0.31 inches |
| 6.38 ounces | 6.03 ounces |
| Blue | Gray, Phantom pink, Violet and White |
| -- | Aluminum and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 107.00 | $ 722.00 |
| Display / Screen | |
| 5.5 inches | 6.2 inches |
| 1280 x 720 pixels (HD) | 2400 x 1080 pixels |
| TFT | 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 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 |
| 2 GB RAM | 8 GB RAM |
| Mali-T830 MP1 GPU | Adreno 660 GPU |
| 8.73 | 9.63 |
| Storage | |
| 32 GB internal memory | 128 GB internal memory |
| microSDXC (up to 400 GB) external memory slot | No SD card slot |
| 9.44 | 10.1 |
| Camera | |
| 13.00 MP + 13.00 MP | 12.00 MP + 10.00 MP |
| f/1.70 aperture | f/1.80 aperture |
| 28.00mm 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 |
| 9.13 | 10.78 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE (4G), HSPA+ (4G), HSDPA and HSUPA | 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM | Nano SIM |
| 6.6 | 10.7 |
| Battery Life | |
| 3300mAh Li - Polymer Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| -- | Wireless Charging |
| 5.28 | 5.92 |
| Other Features | |
| Bluetooth 4.2 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | NFC |
| -- | Fingerprint ID Scanner |
| Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| -- | FM Radio |
Comparison review
Samsung Galaxy S21 has a global score of 91.8, which is way better than Samsung Galaxy J7 Star's global score of 73.1. Both phones in this comparison review include Android OS (operating system), but the Samsung Galaxy S21 has older 11 version and Samsung Galaxy J7 Star has Android 9.0 Pie version. The Samsung Galaxy S21 is a incredibly newer cellphone, and it is also just a bit thinner and a bit lighter than Samsung Galaxy J7 Star.
The Samsung Galaxy S21 features a more powerful processor than Galaxy J7 Star, and although they both have a Octa-Core processing unit, the Samsung Galaxy S21 also has a greater amount of RAM memory. Galaxy S21 features a much better looking display than Samsung Galaxy J7 Star, because it has a little bit bigger screen, a way higher 1080 x 2400 resolution and a way better pixel quantity per inch in the display.
The Samsung Galaxy S21 counts with just a bit bigger memory capacity to install games and applications than Galaxy J7 Star, because although it has no SD memory slot, it also counts with 128 GB internal memory capacity. Galaxy S21 features longer battery performance than Galaxy J7 Star, because it has 4000mAh of battery capacity instead of 3300mAh.
The Galaxy S21 captures much better videos and photos than Galaxy J7 Star, because although it has a back-facing camera with less MP resolution and a tinier aperture which is not recommended for shooting pictures and video in low light situations, it also counts with a way higher 7680x4320 video definition and a much bigger sensor.
Although Samsung Galaxy S21 is a better device, it costs a lot more than Galaxy J7 Star, and it doesn't have such a good relation between it's price and quality as Galaxy J7 Star. If you are trying to save some dollars, you can get Galaxy J7 Star, and give up a few features and specs, but you will get the most with your savings.
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