Samsung Galaxy A21s vs Xiaomi Redmi Note 9 Specs Comparison

Compare mobile phone specifications of up to three devices at once. Our specs comparison tool helps you find and compare the perfect phone for your needs.

7.5
Samsung Galaxy A21s
8.5
Xiaomi Redmi Note 9
Samsung Galaxy A21s Xiaomi Redmi Note 9
Released · Jun 19, 2020
Released · May 12, 2020
6.5-inch · 1600x720px
6.5-inch · 2340x1080px
Quad camera
Quad camera
3GB · 32GB
3GB · 64GB
5000 mAh
5020 mAh

Design

Dimensions
6.44 x 2.96 x 0.35 inches
163.7 x 75.3 x 8.9 mm
6.39 x 3.04 x 0.35 inches
162.3 x 77.2 x 8.9 mm
Weight
6.77 oz (192.0 g) 7.02 oz (199.0 g)
Materials
Frame: Plastic
Resistance
Splash
Biometrics
2D Face unlock, Fingerprint (touch) Fingerprint (touch)
Keys
Right: Volume control, Lock/Unlock key Right: Volume control, Lock/Unlock key
Colors
Black, White, Blue, Red Forest green, Polar white, Midnight gray

Display

Size
6.5-inch 6.5-inch
Resolution
1600x720px, 20:9 ratio, 270 PPI 2340x1080px, 19.5:9 ratio, 395 PPI
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 (12 nm)
Processor
Octa-core
8x 2.0GHz Cortex-A55
Octa-core
2000 MHz
Arm Cortex-A75 and ArmCortex-A55
GPU
Mali-G76 Mali G52 MC2
RAM
3GB (LPDDR4) 3GB (LPDDR4)
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 Li - Polymer
Charging
Fast charging Fast charging, Reverse wired charging
Charge speed
Wired: 18.0W
PhoneArena Battery Tests
Battery Life Estimate
Untested
Browsing
Untested
Video
11h 9min
Gaming
7h 48min
Battery Life Estimate
Untested
Browsing
Untested
Video
10h 43min
Gaming
7h 34min

Camera

Rear
Quad 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
48 MP (PDAF)
Aperture size: F1.8
Sensor size: 1/2"
Pixel size: 0.8 μm
Second camera
8 MP (Ultra-wide)
Aperture size: F2.2
Sensor size: 1/4"
Pixel size: 1.12 μm
8 MP (Ultra-wide)
Aperture size: F2.2
Sensor size: 1/4"
Pixel size: 1.2 μm
Third camera
2 MP (Macro)
Aperture size: F2.4
2 MP (Macro, Autofocus)
Aperture size: F2.4
Pixel size: 1.75 μm
Fourth camera
2 MP (Depth information)
Aperture size: F2.4
2 MP
Aperture size: F2.4
Sensor size: 1/5"
Pixel size: 1.7 μm
Flash
LED LED
Video recording
1920x1080 (Full HD) (30 fps) 1920x1080 (Full HD) (30 fps), 1280x720 (HD) (120 fps)
Front
13 MP, Video capture: 1920x1080 (Full HD) 13 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 a,b,g,n,ac,dual-band
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, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope Accelerometer, Gyroscope, Compass
Other
NFC NFC, Infrared

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) 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
VoLTE
Yes

Buyers information

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

Availability

Officially announced
May 15, 2020 Apr 30, 2020

Alternative variants

with 4GB RAM
RAM 4GB
Internal storage 64GB
with 128GB storage
RAM 4GB
Internal storage 128GB
with 6GB RAM
RAM 6GB
Internal storage 64GB
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