Samsung Galaxy A21s vs Xiaomi Redmi Note 9

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Display

Size

6.5 inches
6.5 inches

Resolution

1600 x 720 pixels, 20:9 ratio,
270 PPI
2340 x 1080 pixels, 19.5:9 ratio,
395 PPI

Technology

TFT
IPS LCD

Screen-to-body

82.94 %
83.52 %

Features

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

Hardware

System chip

Samsung Exynos 850
MediaTek Helio G85

Processor

Octa-core, 2000 MHz, Arm Cortex-A55, 64-bit
Octa-core, 2000 MHz, Arm Cortex-A75 and ArmCortex-A55, 64-bit, 12 nm

GPU

Mali-G76
Mali G52 MC2

RAM

3GB LPDDR4
3GB LPDDR4

Internal storage

32GB (eMMC 5.1), available to use: 19.5 GB
64GB (eMMC 5.1)

Storage expansion

microSDXC up to 512 GB
microSDXC up to 128 GB

OS

Android (10), Samsung One UI
Android (10), Xiaomi MI UI

Battery

Capacity

5000 mAh
5020 mAh

Type

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

Battery life test results

 

Charging

Fast charging
Fast charging, Reverse charging

Max charge speed

 
Wired: 18.0W

Camera

Rear

Quad camera
Quad camera

Main camera

48 MP (PDAF)
48 MP (PDAF)

Specifications

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

Second camera

8 MP (Ultra-wide)
8 MP (Ultra-wide)

Specifications

Aperture size: F2.2; Sensor size: 1/4"; Pixel size: 1.12 μm
Aperture size: F2.2; Sensor size: 1/4"; Pixel size: 1.2 μm

Third camera

2 MP (Macro)
2 MP (Macro, Autofocus)

Specifications

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

Fourth camera

2 MP (Depth information)
2 MP

Specifications

Aperture size: F2.4
Aperture size: F2.4; Sensor size: 1/5"; Pixel size: 1.7 μm

Video recording

1920x1080 (Full HD) (30 fps)
1920x1080 (Full HD) (30 fps), 1280x720 (HD) (120 fps)

Front

13 MP
13 MP (HDR)

Design

Dimensions

6.44 x 2.96 x 0.35 inches (163.7 x 75.3 x 8.9 mm)
6.39 x 3.04 x 0.35 inches (162.3 x 77.2 x 8.9 mm)

Weight

6.77 oz (192.0 g)
the average is 6.2 oz (178 g)
7.02 oz (199.0 g)
the average is 6.2 oz (178 g)

Materials

 
Frame: Plastic

Resistance

 
Splash

Biometrics

2D Face unlock, Fingerprint (touch)
Fingerprint (touch)

Colors

Black, White, Blue, Red
Forest green, Polar white, Midnight gray

Cellular

LTE (FDD)

Bands 1(2100), 2(1900), 3(1800), 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), 20(800 DD), 28(700 APT)

LTE (TDD)

Bands 38(2600), 40(2300), 41(2600+)
Bands 38(2600), 40(2300), 41(2600+)

UMTS

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

Data Speed

LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s

Dual SIM

Yes
Yes

SIM type

Nano SIM
Nano SIM

VoLTE

 
Yes

Multimedia

Headphones

3.5mm jack
3.5mm jack

Speakers

Earpiece, Loudspeaker
Earpiece, Loudspeaker

Screen mirroring

Wireless screen share
Wireless screen share

Additional microphone(s)

 
for Noise cancellation

Connectivity & Features

Bluetooth

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

USB

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

Features

Charging
Charging

Location

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

Sensors

Accelerometer, Gyroscope
Accelerometer, Gyroscope, Compass

Other

NFC
NFC, Infrared

Buyers information

In The Box

 
22.5W Charger, Simple protective cover, USB Type-C cable, SIM eject tool, User guide, Warranty card
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