Samsung Galaxy S9 vs Samsung Galaxy A51

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Display

Size

5.8 inches
6.5 inches

Resolution

1440 x 2960 pixels
1080 x 2400 pixels

Pixel density

568 PPI
405 PPI

Technology

Super AMOLED
Super AMOLED

Screen-to-body

84.36 %
87.37 %

Features

HDR video support, Scratch-resistant glass (Corning Gorilla Glass 5), Ambient light sensor, Proximity sensor
Ambient light sensor, Proximity sensor

Hardware & Performance

System chip

Qualcomm Snapdragon 845 SDM845
Samsung Exynos 9611

Processor

Octa-core, 2800 MHz, Kryo 385, 64-bit, 10 nm
Octa-core, 2300 MHz, ARM Cortex-A73 and ARM Cortex-A53, 64-bit, 10 nm

GPU

Adreno 630
Mali-G72 MP3

RAM

4GB
4GB

Internal storage

64GB
128GB

Storage expansion

microSDXC up to 400 GB
microSDXC up to 512 GB

OS

Android (9.0 Pie, 8.0 Oreo), Samsung One UI
Android (10), Samsung One UI

Battery

Capacity

3000 mAh
4000 mAh

Type

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

Charging

Qualcomm Quick Charge 2.0, Samsung Adaptive Fast Charging, Qi and Powermat wireless charging
Fast charging

Camera

Rear

Single camera
Quad camera

Main camera

12 megapixels
48 megapixels

Features

Optical image stabilization, Phase-detection autofocus
Phase-detection autofocus

Second camera

 
12 megapixels

Features

 
Ultra-wide

Third camera

 
5 megapixels

Features

 
Macro

Fourth camera

 
5 megapixels

Features

 
Depth information

Video recording

3840x2160 (4K UHD) (60 fps), 1920x1080 (Full HD) (240 fps), 1280x720 (HD) (960 fps)
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (240 fps)

Features

High Dynamic Range mode (HDR), Time-lapse video, Hyperlapse, Continuous autofocus, Object tracking, Picture-taking during video recording, Video calling, Video sharing
Hyperlapse, Digital image stabilization

Front

8 megapixels
32 megapixels

Features

Autofocus, High Dynamic Range mode (HDR)
High Dynamic Range mode (HDR)

Design

Dimensions

5.81 x 2.70 x 0.33 inches (147.7 x 68.7 x 8.5 mm)
6.24 x 2.90 x 0.31 inches (158.5 x 73.6 x 7.9 mm)

Weight

5.75 oz (163 g)
the average is 6.2 oz (176 g)
6.07 oz (172 g)
the average is 6.2 oz (176 g)

Materials

Back: Glass (Corning Gorilla Glass 5); Frame: Aluminum
Back: Plastic

Resistance

Water, Dust; IP 68
 

Biometrics

Iris scanner, 2D Face unlock, Fingerprint (touch)
2D Face unlock, In-screen fingerprint

Features

Notification light
 

Colors

Midnight black, Coral blue, Titanium gray, Lilac purple, Burgundy red, Sunrise gold, Ice blue
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), 14(700 PS), 17(700 b), 18(800 Lower), 19(800 Upper), 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), 26(850+), 28(700 APT), 66(AWS-3)

LTE (TDD)

Bands 38(2600), 39(1900+), 40(2300), 41(2600+), 46
Bands 38(2600), 40(2300), 41(2600+)

UMTS

850, 900, 1700/2100, 1900, 2100 MHz
850, 900, 1700/2100, 1900, 2100 MHz

Data Speed

LTE-A Pro Cat 18 (1200/150 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA
LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s

Dual SIM

 
Yes

SIM type

Nano SIM
Nano SIM

Multimedia

Headphones

3.5mm jack
3.5mm jack

Features

32-Bit DAC, aptX-HD
Dolby Atmos

Connectivity & Features

Bluetooth

5.0
5.0

Wi-Fi

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

USB

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

Features

Charging, OTG, Video out
Charging, OTG

Sensors

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

Other

NFC, ANT+
NFC, ANT+

Shopping information

MSRP

$ 720
 
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