| Global Score | |
| 87.4 | 76.1 |
| Basic Information | |
| Samsung | Samsung |
| Android 5.0 | Android 10 |
| 2015-04-11 | 2020-06-29 |
| 5.65 x 2.78 x 0.27 inches | 6.61 x 3.02 x 0.32 inches |
| 4.87 ounces | 6.81 ounces |
| Black, Blue, Gold and White | Black |
| Aluminium and Glass | Plastic and Plastic |
| Scratch-Resistant Glass | -- |
| $ 252.00 | $ 194.00 |
| Display / Screen | |
| 5.1 inches | 6.5 inches |
| 1440 x 2560 pixels (Quad HD / 2K) | 1600 x 720 pixels |
| Super AMOLED | IPS LCD |
| 576 pixels per inch | 270 pixels per inch |
| Capacitive, Multi-touch | No touch screen |
| 9.9 | 7.3 |
| Performance | |
| Exynos 7 Octa 7420 chipset | Mediatek Helio P35 chipset |
| 64-bit ARM Cortex-A57 (Quad-Core 2100 MHz + Quad-Core 1500 MHz) processor | Arm Cortex-A53, 64-bit, 12 nm (Octa-Core 2300 MHz) processor |
| 3 GB (1600 MHz) RAM | 3 GB RAM |
| Mali-T760 MP8 (650 MHz) GPU | PowerVR GE8320 GPU |
| 10.08 | 9.27 |
| Storage | |
| 128 GB internal memory | 32 GB internal memory |
| No SD card slot | microSDXC (up to 512 GB) external memory slot |
| 10.1 | 9.84 |
| Camera | |
| 16.00 MP + 5.00 MP | 16.00 MP + 13.00 MP |
| f/1.90 aperture | f/1.80 aperture |
| 28.00mm focal length | -- |
| 0.38 inches (1/2.6") sensor | 0.33 inches (1/3.06") sensor |
| 3840 x 2160 (30 fps) (4K) video resolution | 1920 x 1080 (30 fps) (Full HD) video resolution |
| 10.01 | 9.35 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE-A (4G), LTE (4G), HSPA, HSUPA, UMTS, EDGE, GPRS and GSM | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM, Dual SIM | Nano SIM |
| 6.7 | 6.7 |
| Battery Life | |
| 2550mAh Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | -- |
| 4.56 | 5.92 |
| Other Features | |
| Bluetooth 4.1 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | NFC |
| Infra-red port | -- |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| -- | FM Radio |
Samsung Galaxy S6 is much better than the Samsung Galaxy A21, getting an 87.4 score against 76.1. Although Samsung Galaxy S6 is way older than Samsung Galaxy A21, it's body is thinner and incredibly lighter. Both devices we compare here include Android OS, but Samsung Galaxy S6 has older 5.0 version and Samsung Galaxy A21 has Android 10.
The Samsung Galaxy S6 has just a little better performance than Samsung Galaxy A21, and although they both have the same number of cores and the same RAM amount, the Samsung Galaxy S6 also has a 64-bit CPU and an extra graphics processor. Samsung Galaxy S6 counts with an incredibly better screen than Samsung Galaxy A21, because although it has a way smaller screen, it also counts with a much greater amount of pixels per display inch and a much higher resolution of 2560 x 1440 pixels.
The Galaxy S6 features slightly more storage capacity to store more apps and games than Galaxy A21, because although it has no slot for external memory cards, it also counts with more internal memory. The Samsung Galaxy A21 features a superior battery performance than Samsung Galaxy S6, because it has a 57 percent more battery capacity.
The Galaxy S6 counts with a slightly better camera than Galaxy A21, because although it has a smaller aperture which is not favorable for low-light photography, and they both have the same resolution back facing camera, the Galaxy S6 also counts with a much higher video quality and a bigger sensor providing a better image quality.
Samsung Galaxy S6 is more expensive than Galaxy A21, but you can get a better phone for that extra dollars.
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