Samsung Galaxy A51 vs Samsung Galaxy S21 Specs Comparison

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

Display

Size:

6.5 inches

6.2 inches

Resolution:

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

2400 x 1080 pixels, 20:9 ratio, 424 PPI

Technology:

Super AMOLED

Dynamic AMOLED

Refresh rate:

60Hz

120Hz (adaptive)

Screen-to-body:

87.37 %

86.06 %

Peak brightness:

1300 cd/m2 (nit)

Features:

Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor

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

Hardware

System chip:

Samsung Exynos 9611 (10 nm)

Qualcomm Snapdragon 888 (5 nm)

Processor:

Octa-core, 2300 MHz, 4x 2.3GHz Cortex-A73 + 4x 1.7GHz Cortex-A53, 64-bit

Octa-core, 1x 2.84GHz Kryo 680 + 3x 2.42GHz Kryo 680 + 4x 1.80GHz Kryo 680, 64-bit

GPU:

Mali-G72 MP3

Adreno 660

RAM:

4GB LPDDR4

8GB LPDDR5

Internal storage:

128GB, available to use: 105.9 GB

128GB (UFS 3.0), not expandable

Storage expansion:

microSDXC up to 512 GB

Device type:

Smartphone

OS:

Android (11, 10), Samsung One UI

Android (13, 12, 11), Samsung One UI

Battery

Capacity:

4000 mAh

Type:

Li - Polymer, Not user replaceable

Battery life test results:

link

Charging:

Fast charging

Qualcomm Quick Charge 2.0, USB Power Delivery, Samsung Adaptive Fast Charging, Qi and Powermat wireless charging, Reverse wireless charging

Max charge speed:

Wired: 25.0W; Wireless: 15.0W

Camera

Rear:

Quad camera

Triple camera

Main camera:

48 MP (PDAF)

12 MP (OIS, PDAF)

Specifications:

F2.0; 26 mm; 1/2"; 0.8 μm

F1.8; 26 mm; 1/1.76"; 1.8 μm

Second camera:

12 MP (Ultra-wide)

64 MP (Telephoto, OIS, PDAF)

Specifications:

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

Aperture size: F2.0; Focal Length: 29 mm; Sensor size: 1/1.7"; Pixel size: 0.8 μm

Third camera:

5 MP (Macro)

12 MP (Ultra-wide, Autofocus)

Specifications:

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

Aperture size: F2.2; Focal Length: 13 mm; Sensor size: 1/2.55"; Pixel size: 1.4 μm

Fourth camera:

5 MP (Depth information)

Specifications:

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

Flash:

LED

Video recording:

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

7680x4320 (8K UHD) (24 fps), 3840x2160 (4K UHD) (60 fps), 1920x1080 (Full HD) (240 fps), 1280x720 (HD) (960 fps)

Features:

Hyperlapse, EIS

OIS, HDR, Hyperlapse, Continuous autofocus, Video light, EIS

Front:

32 MP (HDR)

10 MP (PDAF, HDR)

Video capture:

1920x1080 (Full HD)

3840x2160 (4K UHD) (60 fps)

Design

Dimensions:

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

5.97 x 2.80 x 0.31 inches (151.7 x 71.2 x 7.9 mm)

Weight:

6.07 oz (172.0 g)

6.03 oz (171.0 g)

Materials:

Back: Plastic; Frame: Plastic

Back: Plastic; Frame: Aluminum

Resistance:

Water, Dust; IP68

Biometrics:

2D Face unlock, In-screen fingerprint

2D Face unlock, Ultrasonic in-screen fingerprint

Keys:

Right: Volume control, Lock/Unlock key

Colors:

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

Phantom pink, Violet, Gray, White

Cellular

5G:

n2, n5, n12, n25, n41, n66, n71, n77, n260, n261, SA, NSA, Sub-6, mmWave

4G (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), 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), 14(700 PS), 18(800 Lower), 19(800 Upper), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 30(2300 WCS), 66(AWS-3), 71(600)