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Samsung Galaxy A21 vs LG K51 Specs Comparison

Compare mobile phone specifications of up to three devices at once. Our specs comparison tool helps you find and compare the perfect phone for your needs.

Comparison mode:
Specs Size
Differences only
Samsung Galaxy A21
LG K51
Samsung Galaxy A21 LG K51
Released · Jun 29, 2020
Released · May 06, 2020
6.5-inch · 1600x720px
6.5-inch · 1560x720px
Quad camera
Triple camera
3GB · 32GB
3GB · 32GB
4000 mAh
4000 mAh

Design

Dimensions
6.61 x 3.02 x 0.32 inches
167.8 x 76.7 x 8.1 mm 		6.57 x 3.07 x 0.33 inches
166.9 x 77.9 x 8.4 mm
Weight
6.81 oz (193.0 g) 7.17 oz (203.4 g)
Materials
Back: Plastic
Frame: Plastic
Resistance
Yes; MIL-STD-810 certified
Biometrics
Fingerprint (touch) Fingerprint (touch)
Keys
Right: Volume control, Lock/Unlock key Left: Volume control; Right: Lock/Unlock key
Colors
Black Titan gray

Display

Size
6.5-inch 6.5-inch
Resolution
1600x720px, 20:9 ratio, 270 PPI 1560x720px, 19.5:9 ratio, 264 PPI
Technology
IPS LCD IPS LCD
Refresh rate
60Hz
Screen-to-body
79.20 % 79.70 %
Features
Ambient light sensor, Proximity sensor Ambient light sensor, Proximity sensor

Hardware

System chip
Mediatek Helio P35 MT6765 (12 nm) MediaTek Helio P22 MT6762 (12 nm)
Processor
Octa-core
4x 2.3GHz Cortex-A53 + 4x 1.8GHz Cortex-A53 		Octa-core
2000 MHz
Arm Cortex-A53
GPU
PowerVR GE8320 IMG PowerVR GE8320
RAM
3GB (LPDDR4) 3GB
Internal storage
32GB (eMMC 5.1), available to use: 19.8 GB 32GB, available to use: 18 GB
Storage expansion
microSDXC up to 512 GB microSDXC up to 2000 GB
OS
Android (10), Samsung One UI Android (10)

Battery

Capacity
4000 mAh 4000 mAh
Type
Li - Polymer Li - Ion
Charging
Fast charging
Charge speed
Wired: 15.0W

Camera

Rear
Quad camera Triple camera
Main camera
16 MP (PDAF)
Aperture size: F1.8
Sensor size: 1/3.06"
Pixel size: 1 μm 		13 MP (PDAF)
Aperture size: F1.8
Sensor size: 1/3"
Pixel size: 1.12 μm
Second camera
8 MP (Ultra-wide)
Aperture size: F2.2
Sensor size: 1/4"
Pixel size: 1.12 μm 		5 MP (Ultra-wide)
Aperture size: F2.2
Sensor size: 1/5"
Pixel size: 1.12 μm
Third camera
2 MP (Macro)
Aperture size: F2.4 		2 MP (Depth information)
Sensor size: 1/5"
Pixel size: 1.75 μm
Fourth camera
2 MP (Depth information)
Aperture size: F2.4
Flash
LED LED
Video recording
1920x1080 (Full HD) (30 fps) 1920x1080 (Full HD)
Picture-taking during video recording
Front
13 MP, Video capture: 1920x1080 (Full HD) 13 MP, Video capture: 1920x1080 (Full HD)

Connectivity & Features

Bluetooth
5.0 5.0
WLAN
802.11 a,b,g,n,ac,dual-band
Wi-Fi Direct, Hotspot 		802.11 a,b,g,n,ac,dual-band
Wi-Fi Direct, Hotspot
USB
Type-C, USB 2.0 Type-C, USB 2.0
Hearing aid compatible
M4/T3 M3/T3
Location
GPS, A-GPS, Glonass, BeiDou, Cell ID, Wi-Fi positioning GPS, A-GPS, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass Accelerometer, Gyroscope, Compass
Other
NFC

Multimedia

Headphones
3.5mm jack 3.5mm jack
Speakers
Earpiece, Loudspeaker Earpiece, Multiple speakers
Features
DTS:X Virtual Surround
Screen mirroring
Wireless screen share Wireless screen share
Radio
FM FM
Additional microphone(s)
Noise cancellation

Cellular

4G (FDD)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 17(700 b), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 66(AWS-3), 71(600) Bands 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 12(700 a), 13(700 c), 20(800 DD), 25(1900+), 26(850+), 66(AWS-3), 71(600)
4G (TDD)
Bands 38(2600), 39(1900+), 40(2300), 41(2600+) Bands 41(2600+)
3G
Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900) Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)
Data Speed
LTE-A Cat 6 (300/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s LTE-A Cat 6 (300/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
SIM type
Nano SIM Nano SIM
HD Voice
Yes Yes
VoLTE
Yes

Regulatory Approval

FCC approval
Date approved: Apr 17, 2020
FCC ID value: ZCASMA215U 		Date approved: Jun 16, 2020
FCC ID value: ZNFL555DL
Measured SAR
Head: 0.42 W/kg
Body: 1.27 W/kg
Simultaneous Transmission: 1.27 W/kg
Wireless Router: 1.27 W/kg 		Head: 0.66 W/kg
Body: 1.20 W/kg
Simultaneous Transmission: 1.59 W/kg
Wireless Router: 1.27 W/kg
Phablet: 3.96 W/kg

Buyers information

MSRP
$ 250 $ 200
In The Box
This is the official Samsu​ng Galaxy A21 User Guide in English provided from the manufacturer. Charger, USB Cable, SIM Ejector

Availability

Officially announced
Apr 08, 2020 May 06, 2020

Alternative variants

for Verizon
4G (FDD) Bands 1(2100), 2(1900), 3(1800), 5(850), 7(2600), 8(900), 20(800 DD), 28(700 APT)
4G (TDD) Bands 38(2600), 40(2300), 41(2600+)
3G Bands 5(850), 8(900), 2(1900), 1(2100)
for Boost Mobile
OS Android (9.0 Pie)
4G (FDD) Bands 2(1900), 4(AWS-1), 5(850), 12(700 a), 13(700 c), 25(1900+), 26(850+), 66(AWS-3), 71(600)
for Sprint
4G (FDD) Bands 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 12(700 a), 13(700 c), 25(1900+), 26(850+), 66(AWS-3), 71(600)
4G (TDD) Bands 41(2600+)
for Verizon
4G (FDD) Bands 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 12(700 a), 13(700 c), 20(800 DD), 66(AWS-3)
MSRP $ 170
for Metro
4G (FDD) Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 12(700 a), 13(700 c), 20(800 DD), 25(1900+), 26(850+), 66(AWS-3), 71(600)
4G (TDD) Bands 38(2600), 41(2600+)
3G Bands 5(850), 4(1700/2100), 2(1900), 1(2100)
FCC OKs Cingular\'s purchase of AT&T Wireless