Samsung Galaxy A21s vs Xiaomi Redmi Note 9
Compare phone and tablet specifications of up to three devices. Type a model name in the search field of our phone comparison tool or pick a popular device from the ones below.
Display
Size
Resolution
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
GPU
Mali-G76
Mali G52 MC2
RAM
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
Charging
Fast charging
Fast charging, Reverse charging
Max charge speed
Wired: 18.0W
Camera
Rear
Quad camera
Quad camera
Main camera
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
Weight
the average is 6.2 oz (178 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
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
