Samsung Galaxy A21 vs Google Pixel 4a vs Google Pixel 3a

Compare phone and tablet specifications of up to three devices at once.

Display

Size:

6.5 inches
5.8 inches
5.6 inches

Resolution:

1600 x 720 pixels, 20:9 ratio, 270 PPI
2340 x 1080 pixels, 19.5:9 ratio, 444 PPI
2220 x 1080 pixels, 18.5:9 ratio, 444 PPI

Technology:

IPS LCD
OLED
OLED

Screen-to-body:

79.20 %
82.53 %
73.93 %

Features:

60Hz refresh rate, Ambient light sensor, Proximity sensor
60Hz refresh rate, HDR support, Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor
Scratch-resistant glass (Dragontrail), Ambient light sensor, Proximity sensor

Hardware

System chip:

Mediatek Helio P35
Qualcomm Snapdragon 730 SM7150-AA
Qualcomm Snapdragon 670 SDM670

Processor:

Octa-core, 2300 MHz, Arm Cortex-A53, 64-bit, 12 nm
Octa-core, 2200 MHz, Kryo 470, 64-bit, 8 nm
Octa-core, 2000 MHz, Kryo 360, 64-bit, 10 nm

GPU:

PowerVR GE8320
Adreno 618
Adreno 615

RAM:

3GB LPDDR4
6GB LPDDR4
4GB LPDDR4

Internal storage:

32GB (eMMC 5.1), available to use: 19.8 GB
128GB, not expandable
64GB (eMMC), not expandable

Storage expansion:

microSDXC up to 512 GB

Device type:

Smartphone
Smartphone
Smartphone

OS:

Android (10), Samsung One UI
Android (11, 10)
Android (11, 10, 9.0 Pie)

Battery

Capacity:

4000 mAh
3140 mAh
3000 mAh

Type:

Li - Polymer, Not user replaceable
Li - Polymer, Not user replaceable
Not user replaceable

Battery life test results:

Charging:

Fast charging
USB Power Delivery
USB Power Delivery

Max charge speed:

Wired: 15.0W
Wired: 18.0W

Camera

Rear:

Quad camera
Single camera
Single camera

Main camera:

16 MP (PDAF)
12.2 MP (OIS, PDAF)
12.2 MP (OIS, PDAF)

Specifications:

Aperture size: F1.8; Sensor size: 1/3.06"; Pixel size: 1 μm
Aperture size: F1.7; Focal length: 27 mm; Sensor size: 1/2.55"; Pixel size: 1.4 μm
Aperture size: F1.8; Focal length: 28 mm; Sensor size: 1/2.55"; Pixel size: 1.4 μm

Second camera:

8 MP (Ultra-wide)

Specifications:

Aperture size: F2.2; Sensor size: 1/4"; Pixel size: 1.12 μm

Third camera:

2 MP (Macro)

Specifications:

Aperture size: F2.4

Fourth camera:

2 MP (Depth information)

Specifications:

Aperture size: F2.4

Video recording:

1920x1080 (Full HD) (30 fps)
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (240 fps)
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (240 fps)

Features:

EIS
EIS

Front:

13 MP
8 MP
8 MP

Video capture:

1920x1080 (Full HD)
1920x1080 (Full HD)
1920x1080 (Full HD)

Design

Dimensions:

6.61 x 3.02 x 0.32 inches (167.8 x 76.7 x 8.1 mm)
5.67 x 2.73 x 0.32 inches (144 x 69.4 x 8.2 mm)
5.96 x 2.76 x 0.32 inches (151.3 x 70.1 x 8.2 mm)

Weight:

6.81 oz (193.0 g)
5.04 oz (143.0 g)
5.19 oz (147.0 g)

Materials:

Back: Plastic; Frame: Plastic
Back: Plastic; Frame: Plastic
Back: Plastic

Biometrics:

Fingerprint (touch)
Fingerprint (touch)
Fingerprint (touch)

Keys:

Right: Volume control, Lock/Unlock key
Right: Volume control, Lock/Unlock key
Right: Volume control, Lock/Unlock key

Colors:

Black
Just black
Black, Purple, White

Cellular

LTE (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 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 14(700 PS), 17(700 b), 18(800 Lower), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 29(700 d), 30(2300 WCS), 66(AWS-3), 71(600)
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), 32(1500 L-band), 66(AWS-3)

LTE (TDD):

Bands 38(2600), 39(1900+), 40(2300), 41(2600+)
Bands 38(2600), 39(1900+), 40(2300), 41(2600+)
Bands 38(2600), 40(2300), 41(2600+)

UMTS:

Bands 5(850), 8(900), 4(1700/2100), 2(1900), 1(2100)
Bands 5(850), 8(900), 4(1700/2100), 2(1900), 1(2100)
Bands 5(850), 8(900), 4(1700/2100), 2(1900), 1(2100)

Data Speed:

LTE-A Cat 6 (300/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE-A Cat 11 (600/75 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE-A Cat 11 (600/75 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s

Dual SIM:

Yes

SIM type:

Nano SIM
Nano SIM, eSIM
Nano SIM

HD Voice:

Yes
Yes

Multimedia

Headphones:

3.5mm jack
3.5mm jack
3.5mm jack

Speakers:

Earpiece, Loudspeaker
Earpiece, Multiple speakers
Earpiece, Multiple speakers

Features:

aptX, aptX-HD
aptX-HD

Screen mirroring:

Wireless screen share
Wireless screen share
Wireless screen share

Radio:

FM

Additional microphone(s):

for Noise cancellation
for Noise cancellation

Connectivity & Features

Bluetooth:

5.0
5.1
5.0

Wi-Fi:

802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot
802.11 a, b, g, n, ac, dual-band; MIMO, Wi-Fi Direct, Hotspot
802.11 a, b, g, n, ac, dual-band; MIMO, Wi-Fi Direct, Hotspot

USB:

Type-C (reversible), USB 2.0
Type-C (reversible), USB 3.1
Type-C (reversible), USB 2.0

Features:

Charging
Charging
Charging, Mass storage device

Location:

GPS, A-GPS, Glonass, BeiDou, Cell ID, Wi-Fi positioning
GPS, A-GPS, Glonass, Galileo, Cell ID, Wi-Fi positioning
GPS, A-GPS, Glonass, Galileo, Cell ID, Wi-Fi positioning

Sensors:

Accelerometer, Gyroscope, Compass
Accelerometer, Gyroscope, Compass, Barometer
Accelerometer, Gyroscope, Compass, Barometer

Other:

NFC
NFC
NFC, VoIP, Tethering, Computer sync, OTA sync

Hearing aid compatible:

M4, T3
M3, T4
M3, T3

Regulatory Approval

FCC approval:

Date approved:

Apr 17, 2020
Jun 25, 2020
Feb 25, 2019

FCC ID value:

ZCASMA215U link
A4RG025J link
A4RG020G link

Measured SAR:

Head:

0.42 W/kg
1.18 W/kg
1.15 W/kg

Body:

1.27 W/kg
1.19 W/kg
1.13 W/kg

Simultaneous Transmission:

1.27 W/kg
1.59 W/kg
1.59 W/kg

Wireless Router:

1.27 W/kg
1.00 W/kg
1.19 W/kg

Buyers information

Price:

$ 250
$ 349
$ 399

In The Box:

This is the official Samsu​ng Galaxy A21 User Guide in English provided from the manufacturer.
18W USB-C power adapter, 1 m USB-C to USB-C cable (USB 2.0), Quick Start Guide, Quick Switch Adapter, SIM tool
18W USB-C power adapter, 1M USB-C to USB-C cable (USB 2.0), Quick Start Guide, Quick Switch Adapter, SIM tool

Availability

Officially announced:

Apr 08, 2020
Aug 03, 2020
May 07, 2019
FCC OKs Cingular\'s purchase of AT&T Wireless