Samsung Galaxy M21 vs Xiaomi Redmi 9 Specs Comparison

Design

Dimensions
6.26 x 2.96 x 0.35 inches 159.0 x 75.1 x 8.9 mm	6.43 x 3.03 x 0.36 inches 163.32 x 77.01 x 9.1 mm
Weight
6.63 oz (188.0 g)	6.98 oz (198.0 g)
Materials
Back: Plastic Frame: Plastic
Biometrics
2D Face unlock, Fingerprint (touch)	2D Face unlock, Fingerprint (touch)
Keys
Right: Volume control, Lock/Unlock key	Right: Volume control, Lock/Unlock key
Colors
Midnight blue, Raven black	Carbon gray, Sunset purple, Ocean green

Display

Size
6.4-inch	6.5-inch
Resolution
2340x1080px, 19.5:9 ratio, 403 PPI	2340x1080px, 19.5:9 ratio, 395 PPI
Technology
Super AMOLED	IPS LCD
Screen-to-body
84.11 %	83.27 %
Peak brightness
420 cd/m2 (nit)
Features
Scratch-resistant glass (Corning Gorilla Glass 3), Proximity sensor	Oleophobic coating, Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor

Hardware

System chip
Exynos 9611 (10 nm)	MediaTek Helio G80 (12 nm)
Processor
Octa-core 4x 2.3GHz Cortex-A73 + 4x 1.7GHz Cortex-A53	Octa-core 2000 MHz Arm Cortex-A75 and Arm Cortex-A55
GPU
Mali-G72 MP3	Mali G52 MC2
RAM
4GB (LPDDR4)	3GB (LPDDR4)
Internal storage
64GB, available to use: 49 GB	32GB (eMMC 5.1)
Storage expansion
microSDXC up to 512 GB	microSDXC
OS
Android (11, 10), Samsung One UI	Android

Battery

Capacity
6000 mAh	5020 mAh
Type
Li - Polymer
Charging
Fast charging	Qualcomm Quick Charge 3.0
Charge speed
	Wired: 18.0W

PhoneArena Battery Tests

Battery Life Estimate

Untested

Browsing

Untested

Video

Untested

Gaming

Untested

Battery Life Estimate

Untested

Browsing

Untested

Video

9h 15min

Gaming

7h 3min

Learn more on our PhoneArena Battery Test Results page

Camera

Rear
Triple camera	Quad camera
Main camera
48 MP (PDAF) Aperture size: F2.0 Focal length: 26 mm Sensor size: 1/2" Pixel size: 0.8 μm	13 MP (PDAF) Aperture size: F2.2
Second camera
8 MP (Ultra-wide) Aperture size: F2.2 Focal Length: 12 mm Sensor size: 1/4" Pixel size: 1.12 μm	8 MP (Ultra-wide) Aperture size: F2.2
Third camera
5 MP (Depth information) Aperture size: F2.2	5 MP (Macro) Aperture size: F2.4
Fourth camera
	2 MP (Depth information)
Flash
LED	LED
Video recording
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD), 1280x720 (HD) (240 fps) EIS	1920x1080 (Full HD)
Front
20 MP (HDR), Video capture: 1920x1080 (Full HD)	8 MP (HDR), Video capture: 1920x1080 (Full HD)

Connectivity & Features

Bluetooth
5.0	5.0
WLAN
802.11 a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot	802.11 b,g,n Wi-Fi Direct, Hotspot
USB
Type-C, USB 2.0	Type-C, USB 2.0
Location
GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning	GPS, A-GPS, Glonass, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope	Accelerometer, Gyroscope, Compass
Other
	NFC, Infrared

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	FM
Additional microphone(s)
	Noise cancellation

Cellular

4G (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)
4G (TDD)
Bands 38(2600), 40(2300), 41(2600+)	Bands 38(2600), 40(2300), 41(2600+)
3G
Bands 1(2100), 2(1900), 5(850), 8(900)	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, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
Dual SIM
Yes	Yes
SIM type
Nano SIM	Nano SIM
HD Voice
	Yes
VoLTE
	Yes

Buyers information

In The Box
This is the official Samsu​ng Galaxy M21 User Guide in English provided from the manufacturer.	10W Charger, TPU case, USB Type-C cable, SIM eject tool, Warranty card, User guide

Availability

Officially announced
Mar 18, 2020

Alternative variants

with 128GB storage

RAM	6GB
Internal storage	128GB

with 64GB storage

RAM	4GB
Internal storage	64GB

Links

Full specifications
Samsung Galaxy M21 Specs	Xiaomi Redmi 9 Specs
PhoneArena Review
	Xiaomi Redmi 9 Review
User Reviews
	Xiaomi Redmi 9 User Reviews