Xiaomi Redmi Note 9S vs Samsung Galaxy A21s Specs Comparison

Design

Dimensions
6.53 x 3.02 x 0.35 inches 165.75 x 76.68 x 8.8 mm	6.44 x 2.96 x 0.35 inches 163.7 x 75.3 x 8.9 mm
Weight
7.37 oz (209.0 g)	6.77 oz (192.0 g)
Materials
Back: Glass (Corning Gorilla Glass 5)
Biometrics
Fingerprint (touch)	2D Face unlock, Fingerprint (touch)
Keys
Right: Volume control, Lock/Unlock key	Right: Volume control, Lock/Unlock key
Colors
Interstellar grey, Aurora blue, Glacier white	Black, White, Blue, Red

Display

Size
6.7-inch	6.5-inch
Resolution
2400x1080px, 20:9 ratio, 395 PPI	1600x720px, 20:9 ratio, 270 PPI
Technology
IPS LCD	TFT
Screen-to-body
84.42 %	82.94 %
Features
HDR support, Scratch-resistant glass (Corning Gorilla Glass 5), Ambient light sensor, Proximity sensor	Proximity sensor

Hardware

System chip
Qualcomm Snapdragon 720G SM7125 (8 nm)	Samsung Exynos 850
Processor
Octa-core 2300 MHz Kryo 465	Octa-core 8x 2.0GHz Cortex-A55
GPU
Adreno 618	Mali-G76
RAM
4GB (LPDDR4)	3GB (LPDDR4)
Internal storage
64GB	32GB (eMMC 5.1), available to use: 19.5 GB
Storage expansion
microSDXC up to 512 GB	microSDXC up to 512 GB
OS
Android (11, 10)	Android (10), Samsung One UI

Battery

Capacity
5020 mAh	5000 mAh
Type
Li - Polymer	Li - Polymer
Charging
Fast charging	Fast charging

PhoneArena Battery Tests

Battery Life Estimate

Untested

Browsing

Untested

Video

Untested

Gaming

Untested

Battery Life Estimate

Untested

Browsing

Untested

Video

11h 9min

Gaming

7h 48min

Learn more on our PhoneArena Battery Test Results page

Camera

Rear
Quad camera	Quad camera
Main camera
48 MP (PDAF) Aperture size: F1.8 Sensor size: 1/2" Pixel size: 0.8 μm	48 MP (PDAF) Aperture size: F2.0 Focal length: 26 mm Sensor size: 1/2" Pixel size: 0.8 μm
Second camera
8 MP (Ultra-wide) Aperture size: F2.2 Pixel size: 1.12 μm	8 MP (Ultra-wide) Aperture size: F2.2 Sensor size: 1/4" Pixel size: 1.12 μm
Third camera
5 MP (Macro, Autofocus) Aperture size: F2.4 Pixel size: 1.12 μm	2 MP (Macro) Aperture size: F2.4
Fourth camera
2 MP (Depth information) Aperture size: F2.4 Pixel size: 1.75 μm	2 MP (Depth information) Aperture size: F2.4
Flash
Dual LED	LED
Video recording
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (960 fps)	1920x1080 (Full HD) (30 fps)
Front
16 MP (HDR, Slow-motion videos), Video capture: 1920x1080 (Full HD)	13 MP, 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 a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot
USB
Type-C	Type-C, USB 2.0
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, Compass	Accelerometer, Gyroscope
Other
Infrared	NFC

Multimedia

Headphones
3.5mm jack	3.5mm jack
Speakers
Earpiece, Loudspeaker	Earpiece, Loudspeaker
Screen mirroring
Wireless screen share	Wireless screen share
Additional microphone(s)
Noise cancellation

Cellular

4G (FDD)
	Bands 1(2100), 2(1900), 3(1800), 5(850), 7(2600), 8(900), 20(800 DD), 28(700 APT)
4G (TDD)
Bands 38(2600), 40(2300)	Bands 38(2600), 40(2300), 41(2600+)
3G
Bands 5(850), 8(900), 4(1700/2100), 2(1900), 1(2100)	Bands 1(2100), 2(1900), 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
VoLTE
Yes

Buyers information

MSRP
$ 249	€ 240
In The Box
22.5W Wire charger, Simple protective cover, USB Type-C cable, SIM eject tool, User guide, Warranty card

Availability

Officially announced
Mar 23, 2020	May 15, 2020

Alternative variants

with 128GB storage

RAM	6GB
Internal storage	128GB
MSRP	$ 279

with 4GB RAM

RAM	4GB
Internal storage	64GB

with 6GB RAM

RAM	6GB
Internal storage	64GB

Links

Full specifications
Xiaomi Redmi Note 9S Specs	Samsung Galaxy A21s Specs
PhoneArena Review
	Samsung Galaxy A21s Review