Samsung Galaxy M21 vs Xiaomi Redmi Note 9

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Display

Size

6.4 inches
6.5 inches

Resolution

2340 x 1080 pixels, 19.5:9 ratio,
403 PPI
2340 x 1080 pixels, 19.5:9 ratio,
395 PPI

Technology

Super AMOLED
IPS LCD

Screen-to-body

84.11 %
83.52 %

Peak brightness

420 cd/m2 (nit)
 

Features

Scratch-resistant glass (Corning Gorilla Glass 3), Proximity sensor
Scratch-resistant glass (Corning Gorilla Glass 5), Ambient light sensor, Proximity sensor

Hardware

System chip

Exynos 9611
MediaTek Helio G85

Processor

Octa-core, 2300 MHz, Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm
Octa-core, 2000 MHz, Arm Cortex-A75 and ArmCortex-A55, 64-bit, 12 nm

GPU

Mali-G72 MP3
Mali G52 MC2

RAM

4GB LPDDR4
3GB LPDDR4

Internal storage

64GB, available to use: 49 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

6000 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

Triple 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; Focal Length: 12 mm; Sensor size: 1/4"; Pixel size: 1.12 μm
Aperture size: F2.2; Sensor size: 1/4"; Pixel size: 1.2 μm

Third camera

5 MP (Depth information)
2 MP (Macro, Autofocus)

Specifications

Aperture size: F2.2
Aperture size: F2.4; Pixel size: 1.75 μm

Fourth camera

 
2 MP

Specifications

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

Video recording

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

Features

EIS
 

Front

20 MP (HDR)
13 MP (HDR)

Design

Dimensions

6.26 x 2.96 x 0.35 inches (159.0 x 75.1 x 8.9 mm)
6.39 x 3.04 x 0.35 inches (162.3 x 77.2 x 8.9 mm)

Weight

6.63 oz (188.0 g)
the average is 6.2 oz (176 g)
7.02 oz (199.0 g)
the average is 6.2 oz (176 g)

Materials

Back: Plastic; Frame: Plastic
Frame: Plastic

Resistance

 
Splash

Biometrics

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

Colors

Midnight blue, Raven black
Forest green, Polar white, Midnight gray

Cellular

LTE (FDD)

Bands 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800 DD)
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

Features

Dolby Atmos
 

Screen mirroring

Wireless screen share
Wireless screen share

Radio

FM
 

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, 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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