Samsung Galaxy A21 vs Xiaomi Redmi Note 9 Pro vs Samsung Galaxy A51 - specs comparison

Display

Size:

6.5 inches

6.7 inches

6.5 inches

Resolution:

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

2400 x 1080 pixels, 20:9 ratio, 395 PPI

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

Technology:

IPS LCD

Super AMOLED

Screen-to-body:

79.20 %

84.42 %

87.37 %

Features:

60Hz refresh rate, Ambient light sensor, Proximity sensor

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

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

Hardware

System chip:

Mediatek Helio P35

Qualcomm Snapdragon 720G SM7125

Samsung Exynos 9611

Processor:

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

Octa-core, 2300 MHz, Kryo 465, 64-bit, 8 nm

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

GPU:

PowerVR GE8320

Adreno 618

Mali-G72 MP3

RAM:

3GB LPDDR4

6GB LPDDR4

4GB LPDDR4

Internal storage:

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

64GB (UFS 2.1)

128GB, available to use: 105.9 GB

Storage expansion:

microSDXC up to 512 GB

Device type:

Smartphone

OS:

Android (10), Samsung One UI

Android (10), Xiaomi MI UI

Android (10), Samsung One UI

Battery

Capacity:

4000 mAh

5020 mAh

4000 mAh

Type:

Li - Polymer, Not user replaceable

Battery life test results:

link

Charging:

Fast charging

Max charge speed:

Wired: 15.0W

Wired: 30.0W

Camera

Rear:

Quad camera

Main camera:

16 MP (PDAF)

64 MP (PDAF)

48 MP (PDAF)

Specifications:

F1.8; 1/3.06"; 1 μm

F1.9; 26 mm; 1/1.7"; 0.8 μm

F2.0; 26 mm; 1/2"; 0.8 μm

Second camera:

8 MP (Ultra-wide)

12 MP (Ultra-wide)

Specifications:

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

Aperture size: F2.2; Focal Length: 13 mm; Sensor size: 1/4"; Pixel size: 1.12 μm

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

Third camera:

2 MP (Macro)

5 MP (Macro, Autofocus)

5 MP (Macro)

Specifications:

Aperture size: F2.4

Aperture size: F2.4; Sensor size: 1/5"; Pixel size: 1.12 μm

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: F2.4; Sensor size: 1/5"; Pixel size: 1.75 μm

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

Video recording:

1920x1080 (Full HD) (30 fps)

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

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

Features:

Hyperlapse, EIS

Front:

13 MP

16 MP (HDR, Slow-motion videos)

32 MP (HDR)

Video capture:

1920x1080 (Full HD)

Design

Dimensions:

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

6.53 x 3.02 x 0.35 inches (165.8 x 76.7 x 8.8 mm)

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

Weight:

6.81 oz (193.0 g)

7.37 oz (209.0 g)

6.07 oz (172.0 g)

Materials:

Back: Plastic; Frame: Plastic

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

Back: Plastic; Frame: Plastic

Biometrics:

Fingerprint (touch)

2D Face unlock, In-screen fingerprint

Keys:

Right: Volume control, Lock/Unlock key

Colors:

Black

Interstellar gray, Tropical green, Glacier white

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), 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), 20(800 DD), 28(700 APT)

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)