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Global Score
Basic Information
Android 11Android 10
6.50 x 2.98 x 0.35 inches6.61 x 3.02 x 0.32 inches
8.04 ounces6.81 ounces
Phantom black and SilverBlack
Aluminum and Glass (Corning Gorilla Glass Victus)Plastic and Plastic
Scratch-Resistant Glass--
$ 966.00$ 194.00
Display / Screen
6.8 inches6.5 inches
3200 x 1440 pixels 1600 x 720 pixels
516 pixels per inch270 pixels per inch
1500 cd/m2 brightness--
No touch screenNo touch screen
Qualcomm Snapdragon 888 chipsetMediatek Helio P35 chipset
Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processorArm Cortex-A53, 64-bit, 12 nm (Octa-Core 2300 MHz) processor
Adreno 660 GPUPowerVR GE8320 GPU
128 GB internal memory32 GB internal memory
No SD card slotmicroSDXC (up to 512 GB) external memory slot
108.00 MP + 40.00 MP16.00 MP + 13.00 MP
f/1.80 aperturef/1.80 aperture
24.00mm focal length--
0.75 inches (1/1.33") sensor0.33 inches (1/3.06") sensor
7680 x 4320 (24 fps) video resolution1920 x 1080 (30 fps) (Full HD) video resolution
1280 x 720 (960 fps) (HD) slow motion video--
Mobile HotspotMobile Hotspot
5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPALTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA
Nano SIMNano SIM
Battery Life
5000mAh Li - Polymer Battery4000mAh 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

Galaxy S21 Ultra has an overall score of 11.67, which is a lot better than the Galaxy A21's general score of 9.06. These phones come with Android OS (Operating System), but Galaxy S21 Ultra has the newer 11 version and Galaxy A21 has Android 10 version, so it provides you lots of additional features. Galaxy S21 Ultra is an a little thicker and heavier phone than Galaxy A21.

The Samsung Galaxy S21 Ultra features a bit more powerful CPU than Galaxy A21, and although they both have 8 cpu cores, the Samsung Galaxy S21 Ultra also has 9 GB more RAM memory. The Galaxy S21 Ultra counts with an incredibly better looking display than Galaxy A21, because it has a much higher 1440 x 3200 resolution, a quite larger display and a lot greater display pixels density.

Galaxy S21 Ultra features a slightly better storage capacity to store more apps and games than Samsung Galaxy A21, because although it has no slot for external memory cards, it also counts with 128 GB internal storage. Samsung Galaxy S21 Ultra features just a little bit longer battery performance than Samsung Galaxy A21, because it has a 25% larger battery size.

The Galaxy S21 Ultra shoots way better photos and videos than Samsung Galaxy A21, and although they both have a F1.8 aperture, the Galaxy S21 Ultra also has a back facing camera with much more MP, a much larger sensor which provides a way better photo and video quality and a much higher video quality.

Although Galaxy S21 Ultra is a better device, it is a lot more expensive than Samsung Galaxy A21, and it doesn't have such a good price and quality relation as the Samsung Galaxy A21. If you prefer to save some money, you can buy the Samsung Galaxy A21, and give up a couple features, but you will get the most with your savings.