Home Phone comparison Samsung Galaxy A21s and Samsung Galaxy A51 - Which is better?

Samsung Galaxy A21s vs Samsung Galaxy A51

39 out 100
Samsung Galaxy A21s
VS
41 out 100
Samsung Galaxy A51
Samsung Galaxy A21s
Samsung Galaxy A51

Compared 2 smartphones : Samsung Galaxy A21s Manufactured in June, 2020, with display 6.5 with chipsetSamsung Exynos 850, vs Samsung Galaxy A51, Manufactured in December, 2019 with chipsetSamsung Exynos 9 Octa 9611. Below are specs, tests, pros and cons for each device

  1. Differences
  2. Review
  3. Specs
  4. Benchmarks
  5. Battery Life
  6. Cameras
  7. Comments (0)

Key Differences

Device key advantages
Reasons to choose Samsung Galaxy A21s
  • Higher battery capacity: 5000mAh vs 4000mAh
Reasons to choose Samsung Galaxy A51
  • Higher pixel density: 405ppi
  • Lighter design: 172g vs 192g

Versions

Available versions and configurations
Memory Options - 2/32 GB
- 3/32 GB
- 3/64 GB
- 3/128 GB
- 4/32 GB
- 4/64 GB
- 4/128 GB
- 6/64 GB
- 6/128 GB		 - 4/64 GB
- 4/128 GB
- 6/128 GB
- 8/128 GB
- 8/256 GB

Review

Key Specs Samsung Galaxy A21s and Samsung Galaxy A51
Display
Color accuracy, sharpness & brightness
Camera
Main & front camera tests
Performance
App & system performance
Games
3D gaming performance
Battery
Battery life, charging speed & type
Connectivity
Connectivity features
NanoReview Score
Overall score by NanoReview
Adjust each parameter’s importance to find the best match for you.
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Function
Importance (Weight)
Display:
Camera:
Performance:
Gaming:
Battery:
Connectivity:
Higher weight means greater impact on NanoReview score.

Tests & specs

Specs & test comparison
Smartphones:
Samsung Galaxy A21s
vs
Samsung Galaxy A51

Display

Display quality comparison
Type PLS TFT Super AMOLED
Size 6.5 in 6.5 in
Resolution 720x1600 pixels 1080x2400 pixels
Aspect ratio 20:9 20:9
Pixel density 270 ppi 405 ppi
Refresh rate 60 Hz 60 Hz
Adaptive refresh rate No No
Max brightness 540 nits 400 nits
HDR support No No
Screen-to-body ratio 82.9 % 87.5 %
Features n/a Always-On Display
Display test
Peak brightness (auto)
Samsung Galaxy A21s
487 nits
Samsung Galaxy A51
631 nits
sRGB gamut88.4 %98.8 %
PWM (Flicker)500 Hz242 Hz
Response time30.4 ms25 ms
Contrast1500:1∞ Infinite
Sources: NotebookCheck [Samsung Galaxy A21s], [Samsung Galaxy A51]

Design & Build

Design and ergonomics comparison
Height 163.6 mm (6.44 in) 158.5 mm (6.24 in)
Width 75.3 mm (2.96 in) 73.6 mm (2.9 in)
Thickness 8.9 mm (0.35 in) 7.9 mm (0.31 in)
Weight 192 g (6.77 oz) 172 g (6.07 oz)
Water resistance No No
Back panel Plastic Plastic
Frame Plastic Plastic
Colors - Black
- Blue
- Red		 - White
- Black
Fingerprint sensor Yes rear Yes In-Display
Screen-to-body ratio
Samsung Galaxy A21s
82.9 %
Samsung Galaxy A51
87.5 %

Performance

Testing Samsung Galaxy A21s and Samsung Galaxy A51 In benchmarks
Processor
Chipset Samsung Exynos 850 Samsung Exynos 9 Octa 9611
Max Frequency 2000 MHz 2300 MHz
CPU Cores 8 (8) 8 (4 + 4)
Architecture 8/2 (Cortex-A55) - 4/1.7 (Cortex-A53)
- 4/2.3 (Cortex-A73)
Process Samsung Samsung
Transistor Size 8 nm 10 nm
Neural Processor No Yes
Graphics Mali-G52 MP1 Mali-G72 MP3
GPU Cores 24 54
GPU Frequency 850 MHz 850 MHz
FLOPS 40.8 GFLOPS 113.8 GFLOPS
GeekBench v6
Geekbench 6 (Single-Core)
Samsung Galaxy A21s
484
Samsung Galaxy A51
512
Geekbench 6 (Multi-Core)
Samsung Galaxy A21s
1523
Samsung Galaxy A51
1556
Geekbench 6 (Single-Core)484512
Geekbench 6 (Multi-Core)15231556
AnTuTu 10
AnTuTu 10
Samsung Galaxy A21s
191375
Samsung Galaxy A51
268760
CPU6874883857
GPU2680745166
Memory5921063828
UX3661075909
NanoReview Score191375268760
3DMark Wild Life
3DMark Wild Life
Samsung Galaxy A21s
425
Samsung Galaxy A51
812
Max Surface Temp.43.2 °C42.2 °C
Stability98 %95 %
Graphics Test2 fps4 fps
Graphics Score425812
Sources: 3DMark [Samsung Galaxy A21s], [Samsung Galaxy A51]
PCMark 3.0
PCMark 3.0
Samsung Galaxy A21s
5429
Samsung Galaxy A51
n/a
Writing score5426n/a
Web score4708n/a
Video editing5145n/a
Data manipulation3808n/a
NanoReview Score5429n/a

Memory

RAM
RAM Size - 3 GB
- 4 GB		 - 4 GB
- 6 GB
Memory Type LPDDR4X LPDDR4X
Memory Frequency 1866 MHz 1866 MHz
Channels 2 2
Storage
Storage Capacity- 32 GB
- 64 GB		- 64 GB
- 128 GB
Storage TypeeMMC 5.1UFS 2.0
Memory CardMicroSDMicroSD

Software

OS Android 10 (Upgradeable to Android 12) Android 10 (Upgradeable to Android 13)
OS Size 12 GB 23 GB
UI Skin One UI 4.1 One UI 5.1

Battery

Volume 5000 mAh 4000 mAh
Max Charging Power 15 W 15 W
Battery Type Li-Po Li-Po
Removable No No
Wireless Charging No No
Reverse Charging No No
Fast Charging Yes (50% in 60 min) Yes (40% in 35 min)
Full Charge Time 2:10 h 1:50 h
Battery Life Test
Battery Life
Samsung Galaxy A21s
25:00
Samsung Galaxy A51
17:53
Web Browsing09:45 h07:15 h
Video Playback14:13 h11:25 h
Games05:34 h04:49 h
Standby Mode128 h81 h

Main camera

Matrix 48 MP 48 MP
Photo resolution 8000x6000 pixels 8000x6000 pixels
Zoom Digital Digital
Flash LED LED
Stabilization Digital Digital
8K Recording No No
4K Recording No Yes (Up to 30 fps)
1080p Recording Yes (Up to 30 fps) Yes (Up to 30 fps)
Slow Motion No 960 fps (720p)
Wide-angle lens 123 ° 120 °
Lenses count Standard: 48 MP
Ultra-wide: 8 MP
Macro: 2 MP
Depth: 2 MP		 Standard: 48 MP
Ultra-wide: 12 MP
Macro: 5 MP
Depth: 5 MP
Features Bokeh effect - Bokeh effect
- Pro mode
Main lens
Matrix48 MP48 MP
Aperturef/2.0f/2.0
Focal length26 mm26 mm
SensorSamsung S5KGM2Sony IMX582
Sensor size1/2.01/2
Pixel size0.8 μm0.8 μm
AutofocusPhase autofocusPhase autofocus
StabilizationDigitalDigital
Ultra-wide lens
Matrix8 MP12 MP
Aperturef/2.2f/2.2
Focal lengthn/a13 mm
Sensor size1/4.0n/a
Pixel size1.12 μm1.12 μm
StabilizationDigitalDigital

Front camera

Matrix 13 MP 32 MP
Photo resolution 4128x3096 pixels 6560x4928 pixels
Aperture f/2.2 f/2.2
Focal length n/a 26 mm
Sensor CMOS Samsung S5KGD1
Sensor size 1/3.1 1/2.8
Pixel size 1.12 μm 0.8 μm
Autofocus No No
Stabilization Digital Digital
Video resolution 1080p (Full HD) at 30 fps 2160p (4K) at 30 fps
TOF 3D sensor No No

Connectivity

Wi-Fi version Wi-Fi 5 (802.11 a/b/g/n/ac) Wi-Fi 5 (802.11 a/b/g/n/ac)
Wi-Fi features - Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display		 - Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5 5
Bluetooth features PBAP/PAB, PAN, OPP, MAP, HSP, HID, HFP, DIP, AVRCP, A2DP PBAP/PAB, PAN, OPP, MAP, HSP, HID, HFP, DIP, AVRCP, A2DP
USB type USB Type-C USB Type-C
USB version 2 2
USB features - Charging
- USB Storage Mode
- OTG		 - Charging
- USB Storage Mode
- OTG
GPS - GPS
- GLONASS
- Beidou
- Galileo		 - GPS
- GLONASS
- Beidou
- Galileo
NFC* Yes Yes
Infrared Port No No
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *NoNo
Hybrid SlotNoNo
2G BandsGSM850, GSM900, DCS1800, PCS1900GSM 850 / 900 / 1800 / 2100 / 2600
3G BandsB1 (2100), B2 (1900), B5(850), B8 (900)UMTS 850 / 900 / 1900 / 2100
LTE Bands*LTE (B1/B2/B3/B5/B7/B8/B20/B28)LTE (B850/B900/B1800/B2100/B2600)
LTE category1312
5G SupportNoNo

Sound

Speakers Mono Mono
3.5 mm Jack Yes Yes
FM Radio Yes Yes
Dolby Atmos Yes Yes
Speaker Test
Max Volume
Samsung Galaxy A21s
79.5 dB
Samsung Galaxy A51
81.7 dB

Other

Class Budget Mid-range
Announced May, 2020 yr December, 2019 yr
Release Date June, 2020 yr December, 2019 yr
Launch Price ($) 200 399
Sensors - Hall Sensor
- Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor		 - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
* Attention! Config, frequencies, NFC, and other specs may vary by region.

Results

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