Samsung Galaxy M21 vs Xiaomi Redmi Note 9S

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Display

Size

6.4 inches
6.7 inches

Resolution

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

Technology

Super AMOLED
IPS LCD

Screen-to-body

84.11 %
84.42 %

Features

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

Hardware & Performance

System chip

Exynos 9611
Qualcomm Snapdragon 720G SM7125

Processor

Octa-core, 2300 MHz, Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm
Octa-core, 2300 MHz, Kryo 465, 64-bit, 8 nm

GPU

Mali-G72 MP3
Adreno 618

RAM

4GB LPDDR4
4GB LPDDR4

Internal storage

64GB
64GB

Storage expansion

microSDXC up to 512 GB
microSDXC up to 512 GB

OS

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

Battery

Capacity

6000 mAh
5020 mAh

Type

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

Charging

Fast charging
Fast charging

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; Pixel size: 1.12 μm

Third camera

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

Specifications

Aperture size: F2.2
Aperture size: F2.4; Pixel size: 1.12 μm

Fourth camera

 
2 MP (Depth information)

Specifications

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

Video recording

3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD), 1280x720 (HD) (240 fps)
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (960 fps)

Features

EIS
 

Front

20 MP (HDR)
16 MP (HDR, Slow-motion videos)

Design

Dimensions

6.26 x 2.96 x 0.35 inches (159.0 x 75.1 x 8.9 mm)
6.53 x 3.02 x 0.35 inches (165.75 x 76.68 x 8.8 mm)

Weight

6.63 oz (188 g)
the average is 6.5 oz (184 g)
7.37 oz (209 g)
the average is 6.5 oz (184 g)

Materials

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

Biometrics

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

Colors

Midnight blue, Raven black
Interstellar grey, Aurora blue, Glacier white

Cellular

LTE (FDD)

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

LTE (TDD)

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

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

Features

Dolby Atmos
 

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)

Features

Charging
Charging

Sensors

Accelerometer, Gyroscope
Accelerometer, Gyroscope, Compass

Other

 
Infrared

Shopping information

In The Box

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

MSRP

 
$ 249
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