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Global Score
Basic Information
Android 11Android 10
6.50 x 2.98 x 0.35 inches6.50 x 3.02 x 0.33 inches
8.04 ounces6.77 ounces
Phantom black and SilverBlue, Pink and Titanium
Aluminum and Glass (Corning Gorilla Glass Victus)--
Scratch-Resistant Glass--
$ 966.00$ 190.00
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 MT6765 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 memory64 GB internal memory
No SD card slotmicroSDXC (up to 2 TB) external memory slot
108.00 MP + 40.00 MP32.00 MP + 13.00 MP
f/1.80 aperture--
24.00mm focal length--
0.75 inches (1/1.33") 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, Dual SIM
Battery Life
5000mAh Li - Polymer Battery4000mAh 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 Radio--

Comparison review

Samsung Galaxy S21 Ultra is a lot better than LG K51S, with a general score of 11.67 against 9.31. Both of these devices come with Android operating system, but Samsung Galaxy S21 Ultra has newer 11 version and LG K51S has Android 10. The Samsung Galaxy S21 Ultra is a newer cellphone than LG K51S, although it is just a bit thicker and somewhat heavier.

The Galaxy S21 Ultra has just a bit better performance than LG K51S, and although they both have the same number of cores, the Galaxy S21 Ultra also has a higher amount of RAM. Galaxy S21 Ultra counts with an incredibly better screen than LG K51S, because it has a way higher display pixels density, a bit larger display and a way better 1440 x 3200 resolution.

LG K51S has a lot bigger memory for apps and games than Galaxy S21 Ultra, because although it has just 64 GB internal memory, it also counts with a slot for SD memory cards that allows a maximum of 2 TB. Galaxy S21 Ultra captures way better videos and photos than LG K51S, because it has a way higher video definition and a lot higher resolution camera.

Samsung Galaxy S21 Ultra counts with a bit better battery lifetime than LG K51S, because it has a 25% bigger battery capacity.

Although Samsung Galaxy S21 Ultra is a better device, it is way more expensive than the LG K51S, and it doesn't have such a good relation between it's price and quality as LG K51S. So if you want that extra specs, you can buy the Samsung Galaxy S21 Ultra, but if you don't you can save a couple dollars and buy the LG K51S, letting go a couple specifications.