Samsung Galaxy A21 vs Xiaomi Redmi Note 9 Specs Comparison

Availability

Officially announced
Apr 08, 2020	Apr 30, 2020
Prices (MSRP)
$250

Design

Dimensions
6.61 x 3.02 x 0.32 inches 167.8 x 76.7 x 8.1 mm	6.39 x 3.04 x 0.35 inches 162.3 x 77.2 x 8.9 mm
Weight
6.81 oz / 193.0 g	7.02 oz / 199.0 g
Materials
Back: Plastic Frame: Plastic	Frame: Plastic
Resistance
	Splash
Biometrics
Fingerprint (touch)	Fingerprint (touch)
Keys
Right: Volume control, Lock/Unlock key	Right: Volume control, Lock/Unlock key
Colors
Black	Forest green, Polar white, Midnight gray

Display

Size
6.5-inch, 79.20% screen-to-body	6.5-inch, 83.52% screen-to-body
Type
IPS LCD, 60Hz	IPS LCD
Resolution
1600x720px, 20:9 ratio, 270 PPI	2340x1080px, 19.5:9 ratio, 395 PPI
Protection
	Corning Gorilla Glass 5

PhoneArena Display Test

Bright Max (20% APL)
Untested	Untested
Bright Min
Untested	0.8 (Excellent)

Learn more on our PhoneArena Display Test Results page.

Hardware

System chip
Mediatek Helio P35 MT6765 (12 nm)	MediaTek Helio G85 (12 nm)
Processor
Octa-core 4x2.3GHz Cortex-A53 4x1.8G​Hz Cortex-A53	Octa-core 2000 MHz Arm Cortex-A75 and ArmCortex-A55
GPU
PowerVR GE8320	Mali G52 MC2
Memory
3GB (LPDDR4)/32GB (eMMC 5.1)	3GB (LPDDR4)/64GB (eMMC 5.1) 4GB/128GB
Storage expansion
microSDXC up to 512 GB	microSDXC up to 128 GB
OS
Android (10)	Android (10)

Battery

Type
4000 mAh, Li - Polymer	5020 mAh, Li - Polymer
Charging
Fast charging	Fast charging Reverse wired charging
Charge speed
Wired: 15.0W	Wired: 18.0W

PhoneArena Battery Tests

Battery Life Estimate

Untested

Browsing

Untested

Video

Untested

Gaming

Untested

Battery Life Estimate

Untested

Browsing

Untested

Video

10h 43min

Gaming

7h 34min

Learn more on our PhoneArena Battery Test Results page

Camera

Rear
Quad camera	Quad camera
Main camera
16 MP (PDAF) Aperture size: F1.8 Sensor size: 1/3.06" Pixel size: 1 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
1080p (30 fps)	1080p (30 fps), 720p (120 fps)
Front
13 MP Video capture: 1080p	13 MP (HDR) Video capture: 1080p

Connectivity & Features

Bluetooth
5.0	5.0
WLAN
a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot 802.11 a, b, g, n, ac	a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot 802.11 a, b, g, n, ac
USB
Type-C, USB 2.0	Type-C, USB 2.0
Sensors
Accelerometer, Gyroscope, Compass, Ambient light sensor, Proximity sensor	Accelerometer, Gyroscope, Compass, Ambient light sensor, Proximity sensor
Hearing aid compatible
M4/T3
Location
GPS, A-GPS, Glonass, BeiDou, Cell ID, Wi-Fi positioning	GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
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
Radio
FM
Additional microphone(s)
	Noise cancellation

Cellular

LTE Bands
1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 25, 26, 28, 66, 71	1, 2, 3, 4, 5, 7, 8, 20, 28
TDD Bands
38, 39, 40, 41	38, 40, 41
3G Bands
1, 2, 4, 5, 8	1, 2, 4, 5, 8
Data Speed
LTE-A Cat 6 (300/50 Mbit/s), 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
SIM type
Nano SIM	Nano SIM
HD Voice
Yes
VoLTE
	Yes

Regulatory Approval

FCC approval
Date approved: Apr 17, 2020 FCC ID value: ZCASMA215U
Measured SAR
Head: 0.42 W/kg Body: 1.27 W/kg Simultaneous Transmission: 1.27 W/kg Wireless Router: 1.27 W/kg

Alternative variants

for Verizon

LTE Bands	1, 2, 3, 5, 7, 8, 20, 28
TDD Bands	38, 40, 41
3G Bands	5, 8, 2, 1

with 128GB storage

Memory	4GB/128GB

for Sprint

LTE Bands	2, 3, 4, 5, 7, 12, 13, 25, 26, 66, 71
TDD Bands	41

Discover more

Full Specs Samsung Galaxy A21 Specs

Full Specs Xiaomi Redmi Note 9 Specs PA Review Xiaomi Redmi Note 9 Review