Motorola One Action vs Samsung Galaxy A21 vs Samsung Galaxy A51 - specs comparison

Display

Size:

6.3 inches

6.5 inches

Resolution:

2520 x 1080 pixels, 21:9 ratio, 435 PPI

1600 x 720 pixels, 20:9 ratio, 270 PPI

2400 x 1080 pixels, 20:9 ratio, 405 PPI

Technology:

IPS LCD

Super AMOLED

Screen-to-body:

81.47 %

79.20 %

87.37 %

Features:

Ambient light sensor, Proximity sensor

60Hz refresh rate, Ambient light sensor, Proximity sensor

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

Hardware

System chip:

Samsung Exynos 7 Octa 9609

Mediatek Helio P35

Samsung Exynos 9611

Processor:

Octa-core, 2200 MHz, ARM Cortex-A73 and ARM Cortex-A53, 64-bit, 10 nm

Octa-core, 2300 MHz, Arm Cortex-A53, 64-bit, 12 nm

Octa-core, 2300 MHz, ARM Cortex-A73 and ARM Cortex-A53, 64-bit, 10 nm

GPU:

Mali-G72 MP3

PowerVR GE8320

Mali-G72 MP3

RAM:

4GB

3GB LPDDR4

4GB LPDDR4

Internal storage:

128GB

32GB (eMMC 5.1), available to use: 19.8 GB

128GB, available to use: 105.9 GB

Storage expansion:

microSDXC up to 1000 GB

microSDXC up to 512 GB

Device type:

Smartphone

OS:

Android (10, 9.0 Pie)

Android (10), Samsung One UI

Android (11, 10), Samsung One UI

Battery

Capacity:

3500 mAh

4000 mAh

Type:

Li - Polymer, Not user replaceable

Battery life test results:

link

Charging:

Motorola TurboPower

Fast charging

Max charge speed:

Wired: 15.0W

Camera

Rear:

Triple camera

Quad camera

Main camera:

12 MP (PDAF)

16 MP (PDAF)

48 MP (PDAF)

Specifications:

F1.8; 1.25 μm

F1.8; 1/3.06"; 1 μm

F2.0; 26 mm; 1/2"; 0.8 μm

Second camera:

16 MP (Ultra-wide)

8 MP (Ultra-wide)

12 MP (Ultra-wide)

Specifications:

Aperture size: F2.2; Focal Length: 13 mm; Pixel size: 1 μm

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

Aperture size: F2.2; Focal Length: 13 mm; Pixel size: 1.12 μm

Third camera:

5 MP (Depth information)

2 MP (Macro)

5 MP (Macro)

Specifications:

Aperture size: F2.4

Aperture size: F2.4; Focal Length: 40 mm

Fourth camera:

2 MP (Depth information)

5 MP (Depth information)

Specifications:

Aperture size: F2.4

Aperture size: F2.2; Sensor size: 1/5"; Pixel size: 1.12 μm

Video recording:

3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (60 fps), 1280x720 (HD) (120 fps)

1920x1080 (Full HD) (30 fps)

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

Features:

Time-lapse video, Hyperlapse, Continuous autofocus, EIS

Hyperlapse, EIS

Front:

12 MP (HDR)

13 MP

32 MP (HDR)

Video capture:

1920x1080 (Full HD)

Design

Dimensions:

6.30 x 2.80 x 0.36 inches (160.1 x 71.2 x 9.15 mm)

6.61 x 3.02 x 0.32 inches (167.8 x 76.7 x 8.1 mm)

6.24 x 2.90 x 0.31 inches (158.5 x 73.6 x 7.9 mm)

Weight:

6.21 oz (176.0 g)

6.81 oz (193.0 g)

6.07 oz (172.0 g)

Materials:

Back: Plastic

Back: Plastic; Frame: Plastic

Resistance:

Splash; IPX2

Biometrics:

2D Face unlock, Fingerprint (touch)

Fingerprint (touch)

2D Face unlock, In-screen fingerprint

Keys:

Right: Volume control, Lock/Unlock key

Colors:

Denim blue, Pearl white

Black

Prism Crush black, Prism Crush white, Prism Crush pink, Prism Crush blue

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), 25(1900+), 26(850+), 66(AWS-3)

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), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 29(700 d), 30(2300 WCS), 66(AWS-3), 71(600)

LTE (TDD):

Bands 38(2600), 41(2600+)

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

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

UMTS:

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, UMTS

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

LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s

Dual SIM:

Shared with microSD

SIM type:

Nano SIM

HD Voice:

Yes

Multimedia

Headphones:

3.5mm jack

Speakers:

Earpiece, Loudspeaker

Features:

Dolby Mobile

Dolby Atmos

Screen mirroring:

Wireless screen share

Radio:

FM

Additional microphone(s):

for Noise cancellation

Connectivity & Features

Bluetooth:

5.0, EDR

5.0

Wi-Fi:

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

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

USB:

Type-C (reversible), USB 2.0

Features:

Charging, Mass storage device

Charging

Charging, OTG

Location:

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

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

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

Sensors:

Accelerometer, Gyroscope, Compass

Accelerometer, Gyroscope, Compass, Hall (for flip covers)

Other:

NFC

NFC, ANT+

Hearing aid compatible:

M4, T3

Regulatory Approval

FCC approval:

Date approved:

Apr 17, 2020

Nov 28, 2019

FCC ID value:

ZCASMA215U link

A3LSMA515FN link

Measured SAR:

Head:

0.42 W/kg

0.89 W/kg

Body:

1.27 W/kg

1.18 W/kg

Simultaneous Transmission:

1.27 W/kg

1.56 W/kg

Wireless Router:

1.27 W/kg

1.12 W/kg

Phablet:

2.76 W/kg

Buyers information

Price:

$ 350

$ 250

$ 400

User Manual:

This is the official Samsung Galaxy A51 User Guide in English provided from the manufacturer.

In The Box:

10W Charger, USB-C Cable, SIM Pin, Guides, Protect cover, Earphones (for selected countries)

This is the official Samsung Galaxy A21 User Guide in English provided from the manufacturer.

Availability

Officially announced:

Aug 16, 2019

Apr 08, 2020

Dec 12, 2019