Xiaomi Redmi Note 4 vs Samsung Galaxy A21s Specs Comparison

Availability

Officially announced
Jan 19, 2017	May 15, 2020
Prices (MSRP)
$190	€240

Design

Dimensions
5.94 x 2.99 x 0.33 inches 151 x 76 x 8.45 mm	6.44 x 2.96 x 0.35 inches 163.7 x 75.3 x 8.9 mm
Weight
5.82 oz / 165.0 g	6.77 oz / 192.0 g
Materials
Back: Aluminum
Biometrics
Fingerprint (touch)	2D Face unlock, Fingerprint (touch)
Features
Touch sensitive control keys, Soft keys
Keys
Right: Volume control, Lock/Unlock key	Right: Volume control, Lock/Unlock key
Colors
Black, Gold, Gray, Blue, White	Black, White, Blue, Red

Display

Size
5.5-inch, 72.78% screen-to-body	6.5-inch, 82.94% screen-to-body
Type
IPS LCD, 450 nits	TFT
Resolution
1920x1080px, 401 PPI	1600x720px, 20:9 ratio, 270 PPI
Colors
16 777 216

PhoneArena Display Test

Bright Max (20% APL)
Untested	Untested
Bright Min
Untested	4.6 (Poor)

Learn more on our PhoneArena Display Test Results page.

Hardware

System chip
Snapdragon 625 8953	Samsung Exynos 850
Processor
Octa-core 2000 MHz ARM Cortex-A53	Octa-core 8x2.0GHz Cortex-A55
GPU
Adreno 506	Mali-G76
Memory
4GB (LPDDR3)/64GB 2GB/32GB 3GB/32GB	3GB (LPDDR4)/32GB (eMMC 5.1) 4GB/64GB 6GB/64GB
Storage expansion
microSDXC up to 128 GB	microSDXC up to 512 GB
OS
Android (7.0 Nougat, 6.0 Marshmallow)	Android (10)

Battery

Type
4100 mAh, Li - Polymer	5000 mAh, Li - Polymer
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
Single camera	Quad camera
Main camera
13 MP (CMOS image sensor, BSI sensor, PDAF) Aperture size: F2.0 Pixel size: 1.12 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 Sensor size: 1/4" Pixel size: 1.12 μm
Third camera
	2 MP (Macro) Aperture size: F2.4
Fourth camera
	2 MP (Depth information) Aperture size: F2.4
Flash
Dual LED	LED
Video recording
1080p (30 fps), 720p (120 fps) Video calling, Video sharing	1080p (30 fps)
Front
5 MP Video capture: 1080p	13 MP Video capture: 1080p

Connectivity & Features

Bluetooth
4.1	5.0
WLAN
a,b,g,n,dual-band Hotspot, Wi-Fi Direct 802.11 a, b, g, n	a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot 802.11 a, b, g, n, ac
USB
microUSB, USB 2.0	Type-C, USB 2.0
Sensors
Accelerometer, Gyroscope, Hall (for flip covers), Ambient light sensor, Proximity sensor	Accelerometer, Gyroscope, Proximity sensor
Location
GPS, A-GPS, Glonass, BeiDou	GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Other
Infrared, Tethering, Computer sync, OTA sync	NFC

Multimedia

Headphones
3.5mm jack	3.5mm jack
Speakers
Earpiece, Loudspeaker	Earpiece, Loudspeaker
Features
Album art cover, Background playback
Screen mirroring
Wireless screen share	Wireless screen share

Cellular

4G (FDD) Bands
3, 5	1, 2, 3, 5, 7, 8, 20, 28
4G (TDD) Bands
40	38, 40, 41
3G Bands
5, 8, 2, 1	1, 2, 5, 8
Data Speed
LTE-A, HSPA	LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
Dual SIM
Yes	Yes
SIM type
Nano SIM, Micro SIM	Nano SIM
VoLTE
Yes

Phone Features

Notifications
Haptic feedback
Other features
Voice dialing, Voice commands, Voice recording

Alternative variants

Memory	2GB/32GB
Prices (MSRP)	$146

with 4GB RAM

Memory	4GB/64GB

Memory	3GB/32GB
Prices (MSRP)	$161

with 6GB RAM

Memory	6GB/64GB

Discover more

Full Specs Xiaomi Redmi Note 4 Specs

Full Specs Samsung Galaxy A21s Specs PA Review Samsung Galaxy A21s Review