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Global Score
Basic Information
Android 11Android 11, 10
6.50 x 2.98 x 0.35 inches6.26 x 2.90 x 0.34 inches
8.04 ounces6.60 ounces
Phantom black and SilverPrism cube black
Aluminum and Glass (Corning Gorilla Glass Victus)Aluminum and Plastic
Scratch-Resistant GlassScratch-Resistant Glass
$ 966.00$ 339.00
Display / Screen
6.8 inches6.5 inches
3200 x 1440 pixels 2400 x 1080 pixels
516 pixels per inch405 pixels per inch
1500 cd/m2 brightness--
No touch screenNo touch screen
Qualcomm Snapdragon 888 chipsetSamsung Exynos 980 chipset
Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processorARM Cortex-A77 and ARM Cortex-A55, 64-bit, 8 nm (Octa-Core 2200 MHz) processor
Adreno 660 GPUMali-G76 MP5 GPU
128 GB internal memory128 GB internal memory
No SD card slotmicroSDXC (up to 1000 GB) external memory slot
108.00 MP + 40.00 MP48.00 MP + 32.00 MP
f/1.80 aperturef/2.00 aperture
24.00mm focal length26.00mm focal length
0.75 inches (1/1.33") sensor0.5 inches (1/2") sensor
7680 x 4320 (24 fps) video resolution3840 x 2160 (30 fps) (4K) video resolution
1280 x 720 (960 fps) (HD) slow motion video1280 x 720 (480 fps) (HD) slow motion video
Mobile HotspotMobile Hotspot
5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA
Nano SIMNano SIM
Battery Life
5000mAh Li - Polymer Battery4500mAh Li - Polymer Battery
Non-Removable BatteryNon-Removable Battery
Wireless Charging--
Other Features
Bluetooth 5.1 Bluetooth 5.0
Fingerprint ID ScannerFingerprint ID Scanner
Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity SensorAccelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor
FM RadioFM Radio

Comparison review

The Samsung Galaxy S21 Ultra is a little bit better than the Galaxy A51 5G, with a 11.67 score against 10.82. Even though the Samsung Galaxy S21 Ultra is newer than Galaxy A51 5G, it's heavier and a little thicker. Both of these phones use the same Android 11 OS (Operating System), so both of them should provide you identical operating system features.

The Galaxy S21 Ultra features just a little better processing power than Samsung Galaxy A51 5G, and although they both have a Octa-Core processing unit, the Galaxy S21 Ultra also has more RAM. The Galaxy S21 Ultra has a much more vibrant display than Galaxy A51 5G, because it has a quite larger display, a greater count of pixels per display inch and a better 1440 x 3200 resolution.

The Samsung Galaxy A51 5G has a superior storage capacity to install games and applications than Samsung Galaxy S21 Ultra, and although they both have exactly the same internal memory capacity, the Samsung Galaxy A51 5G also has a slot for an SD memory card that holds up to 1000 GB. The Galaxy A51 5G counts with just a bit longer battery duration than Samsung Galaxy S21 Ultra, although it has just 4500mAh of battery size instead of 5000mAh.

Samsung Galaxy S21 Ultra counts with a better camera than Samsung Galaxy A51 5G, because it has a bigger aperture to capture better low-light photos and videos, a much larger camera sensor providing a much higher image quality, a much more MP camera in the back and a much higher 7680x4320 video resolution.

Although Samsung Galaxy S21 Ultra is a better device, it is way more expensive than Galaxy A51 5G, and it doesn't have such a good price and quality relation as the Galaxy A51 5G. If you prefer to save some money, you can buy Galaxy A51 5G, and give up some specs and features, but you'll get the most out of your savings.