Samsung Galaxy A9 (2018) vs Samsung Galaxy A51

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Display

Size

6.3 inches
6.5 inches

Resolution

1080 x 2220 pixels
1080 x 2400 pixels

Pixel density

392 PPI
405 PPI

Technology

Super AMOLED
Super AMOLED

Screen-to-body

80.51 %
87.37 %

Features

Ambient light sensor, Proximity sensor
Ambient light sensor, Proximity sensor

Hardware & Performance

System chip

Qualcomm Snapdragon 660 SDM660
Samsung Exynos 9611

Processor

Octa-core, 2200 MHz, Kryo 260, 64-bit, 14 nm
Octa-core, 2300 MHz, ARM Cortex-A73 and ARM Cortex-A53, 64-bit, 10 nm

GPU

Adreno 512
Mali-G72 MP3

RAM

6GB
4GB

Internal storage

128GB
128GB

Storage expansion

microSDXC up to 512 GB
microSDXC up to 512 GB

OS

Android (8.0 Oreo), Samsung Experience UI
Android (10), Samsung One UI

Battery

Capacity

3800 mAh
4000 mAh

Type

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

Charging

Samsung Adaptive Fast Charging
Fast charging

Camera

Rear

Quad camera
Quad camera

Main camera

24 megapixels
48 megapixels

Features

Phase-detection autofocus
Phase-detection autofocus

Second camera

10 megapixels
12 megapixels

Features

Telephoto, Autofocus
Ultra-wide

Third camera

8 megapixels
5 megapixels

Features

Ultra-wide
Macro

Fourth camera

5 megapixels
5 megapixels

Features

Depth information
Depth information

Video recording

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

Features

Hyperlapse, Continuous autofocus, Digital image stabilization, Video calling, Video sharing
Hyperlapse, Digital image stabilization

Front

24 megapixels
32 megapixels

Features

 
High Dynamic Range mode (HDR)

Design

Dimensions

6.40 x 3.03 x 0.31 inches (162.5 x 77 x 7.8 mm)
6.24 x 2.90 x 0.31 inches (158.5 x 73.6 x 7.9 mm)

Weight

6.46 oz (183 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; Frame: Metal
Back: Plastic

Biometrics

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

Colors

Caviar black, Lemonade blue, Bubblegum pink
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), 20(800 DD), 26(850+), 28(700 APT), 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), 26(850+), 28(700 APT), 66(AWS-3)

LTE (TDD)

Bands 38(2600), 40(2300), 41(2600+)
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 Cat 9 (450/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA, UMTS
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

Album art cover, Background playback
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 2.0
Type-C (reversible), USB 2.0

Features

Charging, Mass storage device
Charging, OTG

Sensors

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

Other

NFC, ANT+, VoIP, Tethering, Computer sync, OTA sync
NFC, ANT+

Shopping information

In The Box

Charger, USB cable, Headphones, SIM removal tool, Documentation
 
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