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

Display

Size:

6.3 inches

6.5 inches

Resolution:

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

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

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

Technology:

IPS LCD

Super AMOLED

IPS LCD

Screen-to-body:

81.47 %

87.37 %

79.20 %

Features:

Ambient light sensor, Proximity sensor

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

60Hz refresh rate, Ambient light sensor, Proximity sensor

Hardware

System chip:

Samsung Exynos 7 Octa 9609

Samsung Exynos 9611

Mediatek Helio P35

Processor:

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

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

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

GPU:

Mali-G72 MP3

PowerVR GE8320

RAM:

4GB

4GB LPDDR4

3GB LPDDR4

Internal storage:

128GB

128GB, available to use: 105.9 GB

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

Storage expansion:

microSDXC up to 1000 GB

microSDXC up to 512 GB

Device type:

Smartphone

OS:

Android (10, 9.0 Pie)

Android (11, 10), Samsung One UI

Android (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)

48 MP (PDAF)

16 MP (PDAF)

Specifications:

F1.8; 1.25 μm

F2.0; 26 mm; 1/2"; 0.8 μm

F1.8; 1/3.06"; 1 μm

Second camera:

16 MP (Ultra-wide)

12 MP (Ultra-wide)

8 MP (Ultra-wide)

Specifications:

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

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

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

Third camera:

5 MP (Depth information)

5 MP (Macro)

2 MP (Macro)

Specifications:

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

Aperture size: F2.4

Fourth camera:

5 MP (Depth information)

2 MP (Depth information)

Specifications:

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

Aperture size: F2.4

Video recording:

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

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

1920x1080 (Full HD) (30 fps)

Features:

Time-lapse video, Hyperlapse, Continuous autofocus, EIS

Hyperlapse, EIS

Front:

12 MP (HDR)

32 MP (HDR)

13 MP

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)

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

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

Weight:

6.21 oz (176.0 g)

6.07 oz (172.0 g)

6.81 oz (193.0 g)

Materials:

Back: Plastic

Back: Plastic; Frame: Plastic

Resistance:

Splash; IPX2

Biometrics:

2D Face unlock, Fingerprint (touch)

2D Face unlock, In-screen fingerprint

Fingerprint (touch)

Keys:

Right: Volume control, Lock/Unlock key

Colors:

Denim blue, Pearl white

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

Black

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), 14(700 PS), 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), 66(AWS-3), 71(600)

LTE (TDD):

Bands 38(2600), 41(2600+)

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

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

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, OTG

Charging

Location:

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

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

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

Sensors:

Accelerometer, Gyroscope, Compass

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

Accelerometer, Gyroscope, Compass

Other:

NFC

NFC, ANT+

NFC

Hearing aid compatible:

M4, T3

Regulatory Approval

FCC approval:

Date approved:

Nov 28, 2019

Apr 17, 2020

FCC ID value:

A3LSMA515FN link

ZCASMA215U link

Measured SAR:

Head:

0.89 W/kg

0.42 W/kg

Body:

1.18 W/kg

1.27 W/kg

Simultaneous Transmission:

1.56 W/kg

1.27 W/kg

Wireless Router:

1.12 W/kg

1.27 W/kg

Phablet:

2.76 W/kg

Buyers information

Price:

$ 350

$ 400

$ 250

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

Dec 12, 2019

Apr 08, 2020