Samsung Galaxy A21s vs Samsung Galaxy A51: Comparison

Comparison of features, performance, design, battery, camera and connectivity between the following smartphones: Samsung Galaxy A21s vs Samsung Galaxy A51. The complete information of specifications to decide which to buy.

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Technical data sheets

Basics

Score

Ki Price/Quality
Score
7.9 Ki Price/Quality
Score
8.2 Ki Price/Quality
Score
Design and Screen score 4.7 Design & Materials 7.8 Design & Materials
Performance and Hardware score 5.9 Performance & Hardware 6.6 Performance & Hardware
Camera score 6.9 Camera 7.7 Camera
Connectivity score 7.1 Connectivity 7.9 Connectivity
Battery score 8.4 Battery 6.2 Battery

User reviews

User score
8.6
42 reviews
7.7
64 reviews

Summary

Inches 6.5" 6.5"
Resolution HD+ FHD+
Usable surface 82% useful 88% useful
Aspect Ratio 20:9 19.5:9
Dimensions 75.3 mm
163.7 mm
8.9 mm
73.6 mm
158.5 mm
7.9 mm
Weight 192 g 172 g
Micro Exynos 850
Octa-Core
Exynos 9611
Octa-Core
RAM 3 GB RAM 4 GB RAM
Storage 32 GB 128 GB
AnTuTu 117.341
v8
179.753
v8
Battery 5000 mAh 4000 mAh
Main Camera 1
48 Mpx · ƒ/2.0
S5KGM2
2 3 4
1
48 Mpx · ƒ/2.0
IMX582 Exmor RS
2 3 4
Selfie Camera SELF 13 Mpx · ƒ/2.2 SELF 32 Mpx · ƒ/2.2
Bands
OS Android 10 Q Android 10 Q

Brand

Brand Samsung Samsung
Aliases SM-A217F, SM-A217F/DS SM-A515F

Release Date

Release date May 2020,
1 year ago
December 2019,
1 year ago
State On Sale On Sale
Market Global Global

Design & Materials

Structure

Samsung Galaxy A21s
Samsung Galaxy A51
Samsung Galaxy A21s
Samsung Galaxy A51
Size
75.3 mm
163.7 mm
8.9 mm
Print 3D Model
73.6 mm
158.5 mm
7.9 mm
Print 3D Model
Weight 192 g 172 g
Usable surface 82 % 88 %
Materials Plastic Plastic
Resistance - -
Colors
Black

White

Blue
Black

White

Blue

Pink

Screen

Diagonal 6.5" 6.5"
Type LCD IPS Super Amoled
Aspect Ratio 20:9 19.5:9
Resolution HD+
720 x 1600 px
FHD+
1080 x 2340 px
Density 270 Pixels per inch 396 Pixels per inch

Others

Others
  • Hole-punch Notch
  • Scratch resistant
  • Capacitive
  • Multi-touch
  • Hole-punch Notch
  • Scratch resistant
  • Capacitive
  • Multi-touch
  • Frameless

User reviews

Is it a drop-resistant and scratch-resistant smartphone?
8.3
6.7
Do you think it's a nice phone?
9.0
8.8
Is it comfortable?
8.9
8.5
Can you see it well in the sunlight?
7.8
8.2
Number of reviews
42 reviews
64 reviews

Performance & Hardware

Processor

Model Samsung Exynos 850 Samsung Exynos 7 Octa 9611
CPU 4x Cortex-A55 2.0 GHz + 4x Cortex-A55 2.0 GHz 4x Cortex-A73 2.3 GHz + 4x Cortex-A53 1.67 GHz
Type Octa-Core Octa-Core
Manufacturing 8 nm 10 nm
Frequency 2 GHz 2.3 GHz
64 Bits Yes Yes

Graphics

GPU ARM Mali-G76 1Ghz ARM Mali-G72 MP3

RAM

RAM 3 GB 4 GB
Type LPDDR4X RAM LPDDR4X RAM

Antutu

Score
117.341
Antutu v8
Overall performance better than 62% of devices
179.753
Antutu v8
Overall performance better than 72% of devices

Storage

Capacity 32 GB 128 GB
Type eMMC 5.1 Storage --
SD Slot Yes ,
Slot for SD or second SIM card
Yes ,
Independent SD slot

Security

Fingerprint Yes, in the back Yes, in screen

Sensors

Sensors
  • Fingerprint
  • Proximity
  • Light sensor
  • Accelerometer
  • Compass
  • Gyroscope
  • Hall
  • Fingerprint
  • Proximity
  • Light sensor
  • Accelerometer
  • Compass
  • Gyroscope

Others

Notifications LED -- --
Cooling system No No
Gaming buttons No No

User reviews

Does it have good sound?
8.7
7.3
Does it work smoothly in everyday use?
8.9
7.6
What's your experience been with demanding games?
8.3
6.4
Number of reviews
42 reviews
64 reviews

Camera

Main

No. of cameras Quad rear camera Quad rear camera
1
Camera type

Standard

Standard
Resolution 48 Mpx 48 Mpx
Sensor Samsung S5KGM2 Sony IMX582 Exmor RS
Type ISOCELL CMOS
Aperture ƒ/ 2.0 ƒ/ 2.0
ISO -- --
Pixel size 0.80 µm 0.80 µm
Pixel Binning 1-4 (2x2) 1-4 (2x2)
Sensor size 1/2 1/2
2
Camera type

Wide Angle lens

Wide Angle lens
Resolution
8 Mpx
12 Mpx
Sensor
Unknown
Unknown
Type
CMOS
--
Aperture
ƒ/ 2.2
ƒ/ 2.2
Pixel size
--
1.12 µm
Pixel Binning
--
--
Sensor size
--
--
3
Camera type

Macro lens

Portrait mode (depth)
Resolution
2 Mpx
5 Mpx
Sensor
Unknown
Unknown
Type
CMOS
--
Aperture
ƒ/ 2.4
ƒ/ 2.2
Pixel size
--
1.12 µm
Pixel Binning
--
--
Sensor size
--
--
4
Camera type

Portrait mode (depth)

Macro lens
Resolution
2 Mpx
5 Mpx
Sensor
Unknown
Unknown
Type
CMOS
--
Aperture
ƒ/ 2.4
ƒ/ 2.4
Pixel size
--
1.12 µm
Pixel Binning
--
--
Sensor size
--
--

Features

Flash LED LED
Optical Stabilisation No No
Slow Motion Video No,
30 fps
Yes,
120 fps
Others
  • Digital zoom
  • Quadruple camera
  • Autofocus
  • Touch focus
  • Phase detection autofocus (PDAF)
  • Continuous shooting
  • Geotagging
  • Panorama
  • HDR
  • Face detection
  • White balance settings
  • ISO settings
  • Exposure compensation
  • Scene mode
  • Self-timer
  • 4K Video
  • Digital zoom
  • Quadruple camera
  • Digital image stabilization
  • Autofocus
  • Touch focus
  • Continuous shooting
  • Geotagging
  • HDR
  • Face detection
  • White balance settings
  • ISO settings
  • Exposure compensation
  • Scene mode
  • Self-timer

Selfie

SELF
Camera type

Dedicated

Dedicated
Resolution 13 Mpx 32 Mpx
Sensor Unknown Sony IMX616
Type CMOS CMOS
Aperture ƒ/ 2.2 ƒ/ 2.2
Pixel size 1.12 µm 0.80 µm
Pixel Binning -- 1-4 (2x2)
Sensor size -- 1/2.8
Others
--
--

DxOMark Score

DxOMark Score -- --

User reviews

Quality of daytime photos
9.3
8.5
Quality of nighttime photos
8.1
6.8
Quality of selfies
8.6
8.2
Does it have a powerful flash?
8.9
8.2
Number of reviews
42 reviews
64 reviews

Connectivity

Network compatibility

5G -- --
4G LTE
  • B1 (2100)
  • B3 (1800)
  • B4 (1700/2100 AWS 1)
  • B5 (850)
  • B7 (2600)
  • B8 (900)
  • B20 (800)
  • B28b (700)
  • B28a (700)
  • B38 (TDD 2600)
  • B40 (TDD 2300)
  • B41 (TDD 2500)
  • B1 (2100)
  • B2 (1900)
  • B3 (1800)
  • B4 (1700/2100 AWS 1)
  • B5 (850)
  • B7 (2600)
  • B8 (900)
  • B12 (700)
  • B13 (700)
  • B17 (700)
  • B20 (800)
  • B26 (850)
  • B28b (700)
  • B28a (700)
  • B38 (TDD 2600)
  • B40 (TDD 2300)
  • B41 (TDD 2500)
  • B66 (1700/2100)
3G
  • B1 (2100)
  • B2 (1900)
  • B5 (850)
  • B8 (900)
  • B1 (2100)
  • B2 (1900)
  • B4 (1700/2100 AWS A-F)
  • B5 (850)
  • B8 (900)
2G
  • B2 (1900)
  • B3 (1800)
  • B5 (850)
  • B8 (900)
  • B2 (1900)
  • B3 (1800)
  • B5 (850)
  • B8 (900)

SIM card

Dual SIM Dual Sim Dual Standby Dual Sim Dual Standby
Type
  • Nano SIM
  • Nano SIM
  • Nano SIM
  • Nano SIM

Wi-Fi

Wi-Fi
  • 802.11a
  • 802.11b
  • 802.11g
  • 802.11n
  • 802.11n 5GHz
  • 802.11ac
  • 802.11a
  • 802.11b
  • 802.11g
  • 802.11n
  • 802.11n 5GHz
  • 802.11ac
Others
  • Wi-Fi Hotspot
  • Wi-Fi Direct
  • Wi-Fi Display
  • Dual band
  • Wi-Fi Hotspot
  • Wi-Fi Direct
  • Wi-Fi Display

Bluetooth

Version Bluetooth 5.0 LE Low energy consumption Bluetooth 5.0
Others
  • A2DP (Advanced Audio Distribution Profile)
  • AVRCP (Audio/Visual Remote Control Profile)
  • DIP (Device ID Profile)
  • HFP (Hands-Free Profile)
  • HID (Human Interface Profile)
  • HSP (Headset Profile)
  • LE (Low Energy)
  • MAP (Message Access Profile)
  • PAN (Personal Area Networking Profile)
  • OPP (Object Push Profile)
  • PBAP/PAB (Phone Book Access Profile)
  • HOGP
  • A2DP (Advanced Audio Distribution Profile)
  • AVRCP (Audio/Visual Remote Control Profile)
  • DIP (Device ID Profile)
  • HFP (Hands-Free Profile)
  • HID (Human Interface Profile)
  • HSP (Headset Profile)
  • MAP (Message Access Profile)
  • PAN (Personal Area Networking Profile)
  • OPP (Object Push Profile)
  • PBAP/PAB (Phone Book Access Profile)
  • HOGP
  • ANT+

Navigation

Navigation
  • GPS
  • A-GPS
  • GLONASS
  • Beidou
  • GPS
  • A-GPS
  • GLONASS
  • Beidou
  • Galileo

USB

USB
  • Charging
  • Mass Storage
  • USB On-The-Go (OTG)
  • USB Type C
  • Charging
  • Mass Storage
  • USB On-The-Go (OTG)
  • USB Type C

SAR

European measurement

The European Union sets a limit of 2 W/kg averaged over 10 grams of tissue.

0.230 W/Kg on head
1.380 W/Kg on body
--
American measurement

The FCC limit is 1.6 W/kg measured in a volume of 1 gram of tissue

-- --

Others

Others
  • NFC
  • Audio Jack
  • Radio FM
  • Computer sync
  • OTA sync
  • Tethering.
  • VoLTE
  • NFC
  • Audio Jack
  • Radio FM
  • Computer sync
  • OTA sync
  • Tethering.
  • VoLTE
  • ANT+

User reviews

Does it have good coverage for calls?
8.8
8.4
Quality of the GPS
8.8
8.6
And the WiFi?
9.0
8.5
Number of reviews
42 reviews
64 reviews

Battery

Battery

Capacity
5000 mAh
4000 mAh
Type Li-Polymer Li-Polymer
Fast charge Yes,
15.0W
Yes,
15.0W
Others
  • Non-removable
  • Non-removable

User reviews

How long does the battery last?
  • 0%
    Less than half day
  • 0%
    Less than a day
  • 14%
    One day
  • 48%
    More than one day
  • 38%
    Two days or more
  • 5%
    Less than half day
  • 19%
    Less than a day
  • 47%
    One day
  • 25%
    More than one day
  • 5%
    Two days or more
Number of reviews
42 reviews
64 reviews

Software

Software

Operating System
  • Android 10
    Android 10 Q, 1 year ago
  • Android 10
    Android 10 Q, 1 year ago
Google Services (official) Yes Yes

User reviews

Did it come with preinstalled applications?
  • 5%
    It comes with a clean operating system
  • 76%
    It has preinstalled apps but they don't bother me
  • 19%
    It has preinstalled apps that I can't uninstall
  • 3%
    It comes with a clean operating system
  • 72%
    It has preinstalled apps but they don't bother me
  • 25%
    It has preinstalled apps that I can't uninstall
Do you regularly receive updates?
  • 0%
    Never
  • 6%
    Once a year
  • 34%
    Every six months
  • 59%
    Every two months or less
  • 2%
    Never
  • 2%
    Once a year
  • 40%
    Every six months
  • 56%
    Every two months or less
Number of reviews
42 reviews
64 reviews

Prices

Prices

Prices

Prices for the version Global  •  3GB  •  32GB  •  SM-A217FDS Change

Prices

Prices for the version Global  •  4GB  •  128GB  •  A515F Change