Samsung Galaxy A21s vs Samsung Galaxy A51 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.

Comparison mode:
Specs Size
Differences only
7.5
Samsung Galaxy A21s
7.0
Samsung Galaxy A51
Samsung Galaxy A21s Samsung Galaxy A51
Released · Jun 19, 2020
Released · Dec 27, 2019
6.5-inch · 1600x720px
6.5-inch · 2400x1080px
Quad camera
Quad camera
3GB · 32GB
4GB · 128GB
5000 mAh
4000 mAh
Check prices Check prices

Availability

Officially announced
May 15, 2020 Dec 12, 2019
Prices (MSRP)
€240 $400

Design

Dimensions
6.44 x 2.96 x 0.35 inches
163.7 x 75.3 x 8.9 mm 		6.24 x 2.90 x 0.31 inches
158.5 x 73.6 x 7.9 mm
Weight
6.77 oz / 192.0 g 6.07 oz / 172.0 g
Materials
Back: Plastic
Frame: Plastic
Biometrics
2D Face unlock, Fingerprint (touch) 2D Face unlock, Optical in-screen fingerprint
Keys
Right: Volume control, Lock/Unlock key Right: Volume control, Lock/Unlock key
Colors
Black, White, Blue, Red Prism Crush black, Prism Crush white, Prism Crush pink, Prism Crush blue

Display

Size
6.5-inch, 82.94% screen-to-body 6.5-inch, 87.37% screen-to-body
Type
TFT Super AMOLED, 60Hz
Resolution
1600x720px, 20:9 ratio, 270 PPI 2400x1080px, 20:9 ratio, 405 PPI
Protection
Corning Gorilla Glass 3
PhoneArena Display Test
Bright Max (20% APL)
Untested Untested
Bright Min
4.6 (Poor) 1.7 (Good)
Learn more on our PhoneArena Display Test Results page.

Hardware

System chip
Samsung Exynos 850 Samsung Exynos 9611 (10 nm)
Processor
Octa-core
8x2.0GHz Cortex-A55 		Octa-core
2300 MHz
4x2.3GHz Cortex-A73
4x1.7G​Hz Cortex-A53
GPU
Mali-G76 Mali-G72 MP3
Memory
3GB (LPDDR4)/32GB (eMMC 5.1)
4GB/64GB
6GB/64GB 		4GB (LPDDR4)/128GB
6GB/128GB
Storage expansion
microSDXC up to 512 GB microSDXC up to 512 GB
OS
Android (10) Android (11, 10)

Battery

Type
5000 mAh, Li - Polymer 4000 mAh, Li - Polymer
Charging
Fast charging Fast charging
PhoneArena Battery Tests
Battery Life Estimate
Untested
Browsing
Untested
Video
11h 9min
Gaming
7h 48min
Battery Life Estimate
5h 22min
Browsing
11h 35min
Video
8h 35min
Gaming
6h 40min
Learn more on our PhoneArena Battery Test Results page

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: 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 		12 MP (Ultra-wide)
Aperture size: F2.2
Focal Length: 13 mm
Pixel size: 1.12 μm
Third camera
2 MP (Macro)
Aperture size: F2.4 		5 MP (Macro)
Aperture size: F2.4
Focal Length: 40 mm
Fourth camera
2 MP (Depth information)
Aperture size: F2.4 		5 MP (Depth information)
Aperture size: F2.2
Sensor size: 1/5"
Pixel size: 1.12 μm
Flash
LED LED
Video recording
1080p (30 fps) 4K UHD (30 fps), 1080p (120 fps), 720p (240 fps)
Hyperlapse, EIS
Front
13 MP
Video capture: 1080p 		32 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, Proximity sensor Accelerometer, Gyroscope, Compass, Hall (for flip covers), Ambient light sensor, Proximity sensor
Location
GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Other
NFC NFC, ANT+

Multimedia

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

Cellular

4G (FDD) Bands
1, 2, 3, 5, 7, 8, 20, 28 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 20, 25, 26, 28, 29, 30, 66, 71
4G (TDD) Bands
38, 40, 41 38, 39, 41
3G Bands
1, 2, 5, 8 1, 2, 4, 5, 8
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
SIM type
Nano SIM Nano SIM

Regulatory Approval

FCC approval
Date approved: Nov 28, 2019
FCC ID value: A3LSMA515FN
Measured SAR
Head: 0.89 W/kg
Body: 1.18 W/kg
Simultaneous Transmission: 1.56 W/kg
Wireless Router: 1.12 W/kg
Phablet: 2.76 W/kg

Alternative variants

with 4GB RAM
Memory 4GB/64GB
with 128GB storage
Memory 6GB/128GB
with 6GB RAM
Memory 6GB/64GB
for Verizon
4G (FDD) Bands 2, 3, 4, 5, 7, 13, 20, 28, 66
3G Bands 5, 8, 2, 1
for AT&T
4G (FDD) Bands 2, 4, 5, 12, 13, 25, 26, 66, 71
4G (TDD) Bands 41
for Sprint
4G (FDD) Bands 2, 4, 5, 12, 13, 25, 26, 66, 71
4G (TDD) Bands 41
for Europe
4G (FDD) Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 26, 28, 66
4G (TDD) Bands 38, 40, 41
Dual SIM Yes
FCC OKs Cingular\'s purchase of AT&T Wireless