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Xiaomi Redmi 9T vs Samsung Galaxy A51 5G vs Samsung Galaxy S21

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

Comparison mode:

Display

Size:

6.5 inches
6.5 inches
6.2 inches

Resolution:

2340 x 1080 pixels, 19.5:9 ratio, 395 PPI
2400 x 1080 pixels, 20:9 ratio, 405 PPI
2400 x 1080 pixels, 20:9 ratio, 424 PPI

Technology:

IPS LCD
Super AMOLED
Dynamic AMOLED

Refresh rate:

60Hz
120Hz (adaptive)

Screen-to-body:

82.14 %
87.37 %
86.06 %

Peak brightness:

1300 cd/m2 (nit)

Features:

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

Qualcomm Snapdragon 662 SM6115
Samsung Exynos 980
Qualcomm Snapdragon 888

Processor:

Octa-core, 2000 MHz, Kryo 260, 64-bit, 11 nm
Octa-core, 2200 MHz, ARM Cortex-A77 and ARM Cortex-A55, 64-bit, 8 nm
Octa-core, 2840 MHz, Kryo 680, 64-bit, 5 nm

GPU:

Adreno 610
Mali-G76 MP5
Adreno 660

RAM:

4GB
6GB LPDDR4
8GB LPDDR5

Internal storage:

64GB (UFS 2.1)
128GB, available to use: 105.3 GB
128GB (UFS 3.0), not expandable

Storage expansion:

microSDXC up to 512 GB
microSDXC up to 1000 GB

Device type:

Smartphone
Smartphone
Smartphone

OS:

Android (10)
Android (11, 10), Samsung One UI
Android (11), Samsung One UI

Battery

Capacity:

6000 mAh
4500 mAh
4000 mAh

Type:

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

Charging:

Fast charging, Reverse 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: 18.0W
Wired: 25.0W
Wired: 25.0W; Wireless: 15.0W

Camera

Rear:

Quad camera
Quad camera
Triple camera

Main camera:

48 MP (PDAF)
48 MP (PDAF)
12 MP (OIS, PDAF)

Specifications:

Aperture size: F1.8; Sensor size: 1/2"; Pixel size: 0.8 μm
Aperture size: F2.0; Focal length: 26 mm; Sensor size: 1/2"; Pixel size: 0.8 μm
Aperture size: F1.8; Focal length: 26 mm; Sensor size: 1/1.76"; Pixel size: 1.8 μm

Second camera:

8 MP (Ultra-wide)
12 MP (Ultra-wide)
64 MP (Telephoto, OIS, PDAF)

Specifications:

Aperture size: F2.2
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:

2 MP (Macro)
5 MP (Macro)
12 MP (Ultra-wide, Autofocus)

Specifications:

Aperture size: F2.4; Pixel size: 1.75 μm
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:

2 MP (Depth information)
5 MP (Depth information)

Specifications:

Aperture size: F2.4; 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), 1280x720 (HD) (30 fps)
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (480 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:

8 MP
32 MP (HDR)
10 MP (PDAF, HDR)

Video capture:

1920x1080 (Full HD)
1920x1080 (Full HD)
3840x2160 (4K UHD) (60 fps)

Design

Dimensions:

6.39 x 3.04 x 0.38 inches (162.3 x 77.3 x 9.6 mm)
6.26 x 2.90 x 0.34 inches (158.9 x 73.6 x 8.7 mm)
5.97 x 2.80 x 0.31 inches (151.7 x 71.2 x 7.9 mm)

Weight:

6.98 oz (198.0 g)
6.60 oz (187.0 g)
6.03 oz (171.0 g)

Materials:

Back: Plastic; Frame: Plastic
Back: Plastic; Frame: Aluminum
Back: Plastic; Frame: Aluminum

Resistance:

Splash
Water, Dust; IP68

Biometrics:

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

Keys:

Right: Volume control, Lock/Unlock key
Right: Volume control, Lock/Unlock key
Right: Volume control, Lock/Unlock key

Colors:

Carbon gray, Twilight blue, Sunrise orange, Ocean green
Prism cube black
Phantom pink, Violet, Gray, White

Cellular

5G:

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

LTE (FDD):

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), 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), 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)

LTE (TDD):

Bands 38(2600), 40(2300), 41(2600+)
Bands 38(2600), 39(1900+), 40(2300), 41(2600+)
Bands 38(2600), 39(1900+), 40(2300), 41(2600+), 46, 48(3600)

UMTS:

Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)
Bands 1(2100), 2(1900), 4(1700/2100), 5(850)
Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)

Data Speed:

LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE-A Pro Cat 16 (1000/150 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s, UMTS

Dual SIM:

Yes

SIM type:

Nano SIM
Nano SIM

HD Voice:

Yes

Multimedia

Headphones:

3.5mm jack
3.5mm jack
No 3.5mm jack

Speakers:

Earpiece, Multiple speakers
Earpiece, Loudspeaker
Earpiece, Multiple speakers

Features:

Dolby Atmos
32-Bit DAC, Dolby Atmos, aptX, Dolby Digital, Dolby Digital Plus

Screen mirroring:

Wireless screen share
Wireless screen share
Wireless screen share

Radio:

FM
FM
FM, Stereo, RDS

Additional microphone(s):

for Noise cancellation
for Noise cancellation
for Noise cancellation, Video recording

Connectivity & Features

Bluetooth:

5.0
5.0
5.0

Wi-Fi:

802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot
802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot
802.11 a, b, g, n, ac, ax (Wi-Fi 6), dual-band; MIMO, Wi-Fi Direct, Hotspot

USB:

Type-C (reversible)
Type-C (reversible), USB 2.0
Type-C (reversible), USB 3.2

Features:

Charging
Charging, OTG
Charging, Headphones port, OTG, Video out

Location:

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

Sensors:

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

Other:

Infrared
NFC, ANT+
NFC, ANT+

Hearing aid compatible:

M3, T3
M3, T3

Regulatory Approval

FCC approval:

Date approved:

Jan 19, 2021
Jul 15, 2020
Dec 08, 2020

FCC ID value:

2AFZZJ19SL
A3LSMA516U
A3LSMG991U

Measured SAR:

Head:

1.09 W/kg
1.18 W/kg
0.36 W/kg

Body:

0.72 W/kg
1.20 W/kg
1.08 W/kg

Simultaneous Transmission:

1.58 W/kg
3.25 W/kg
3.96 W/kg

Wireless Router:

1.10 W/kg
1.37 W/kg
1.09 W/kg

Phablet:

2.49 W/kg

Buyers information

Price:

€ 159
$ 500
$ 800

User Manual:

This is the official Samsu​ng Galaxy A51 5G User Guide in English provided from the manufacturer.

In The Box:

22.5W adapter, USB-C cable, SIM eject tool, Soft case, User guide, Warranty card
A to C USB Cable, Wall Adapter, SIM Pin/Ejector, Quick Start Guide, Terms & Conditions
C to C Data Cable, Ejection Pin

Availability

Officially announced:

Jan 08, 2021
Apr 08, 2020
Jan 14, 2021
FCC OKs Cingular\'s purchase of AT&T Wireless