| Global Score | |
| 87.4 | 98.1 |
| Basic Information | |
| Samsung | Samsung |
| Android 5.0 | Android 11 |
| 2015-04-11 | 2021-01-29 |
| 5.65 x 2.78 x 0.27 inches | 6.50 x 2.98 x 0.35 inches |
| 4.87 ounces | 8.04 ounces |
| Black, Blue, Gold and White | Phantom black and Silver |
| Aluminium and Glass | Aluminum and Glass (Corning Gorilla Glass Victus) |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 252.00 | $ 966.00 |
| Display / Screen | |
| 5.1 inches | 6.8 inches |
| 1440 x 2560 pixels (Quad HD / 2K) | 3200 x 1440 pixels |
| Super AMOLED | Dynamic AMOLED |
| 576 pixels per inch | 516 pixels per inch |
| -- | 1500 cd/m2 brightness |
| Capacitive, Multi-touch | No touch screen |
| 9.9 | 9.8 |
| Performance | |
| Exynos 7 Octa 7420 chipset | Qualcomm Snapdragon 888 chipset |
| 64-bit ARM Cortex-A57 (Quad-Core 2100 MHz + Quad-Core 1500 MHz) processor | Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor |
| 3 GB (1600 MHz) RAM | 12 GB RAM |
| Mali-T760 MP8 (650 MHz) GPU | Adreno 660 GPU |
| 10.08 | 9.72 |
| Storage | |
| 128 GB internal memory | 128 GB internal memory |
| No SD card slot | No SD card slot |
| 10.1 | 10.1 |
| Camera | |
| 16.00 MP + 5.00 MP | 108.00 MP + 40.00 MP |
| f/1.90 aperture | f/1.80 aperture |
| 28.00mm focal length | 24.00mm focal length |
| 0.38 inches (1/2.6") sensor | 0.75 inches (1/1.33") sensor |
| 3840 x 2160 (30 fps) (4K) video resolution | 7680 x 4320 (24 fps) video resolution |
| -- | 1280 x 720 (960 fps) (HD) slow motion video |
| 10.01 | 13.75 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE-A (4G), LTE (4G), HSPA, HSUPA, UMTS, EDGE, GPRS and GSM | 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM, Dual SIM | Nano SIM |
| 6.7 | 10.7 |
| Battery Life | |
| 2550mAh Battery | 5000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | Wireless Charging |
| 4.56 | 6.8 |
| Other Features | |
| Bluetooth 4.1 | Bluetooth 5.1 |
| GPS | GPS |
| NFC | NFC |
| Infra-red port | -- |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| -- | FM Radio |
Galaxy S21 Ultra has an overall score of 98.1, which is much better than the Galaxy S6's general score of 87.4. These devices work with Android operating system, but Galaxy S21 Ultra has the newer 11 version while Galaxy S6 has Android 5.0, providing you some nice extra features. The Galaxy S21 Ultra body is noticeably newer, but incredibly thicker and extremely heavier than Galaxy S6.
Galaxy S6 counts with a bit more vivid display than Galaxy S21 Ultra, because although it has a lot smaller screen and a little bit worse resolution of 2560 x 1440px, it also counts with a bit greater display density. The Galaxy S21 Ultra features as much storage to install applications and games as the Galaxy S6 one, both of them have the same internal storage.
Galaxy S6 features just a bit better performance than Galaxy S21 Ultra, because although it has 9 GB lesser RAM, and they both have a Octa-Core processing unit, the Galaxy S6 also counts with a 64-bits processing unit and a GPU. The Galaxy S21 Ultra features a way better battery lifetime than Galaxy S6, because it has 5000mAh of battery capacity instead of 2550mAh.
Samsung Galaxy S21 Ultra counts with a greater camera than Galaxy S6, because it has a back-facing camera with much more megapixels, a lot bigger back camera sensor taking way higher quality videos and photographs, a much better video definition and a larger aperture.
Although Samsung Galaxy S21 Ultra is a better device, it is way more expensive than Galaxy S6, and it doesn't have such a good price and quality relation as Galaxy S6. If you are trying to save a few dollars, you can get the Galaxy S6, and give up a few features and specs, but you will get the most with your money.
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