Home > Smartphone comparison > Galaxy A51 vs Galaxy A31 – which one to choose?

Samsung Galaxy A51 vs Galaxy A31

Here we compared two mid-range smartphones: the 6.5-inch Samsung Galaxy A51 (with Exynos 9 Octa 9611) that was released on December 12, 2019, against the Samsung Galaxy A31, which is powered by Mediatek Helio P65 and came out 3 months after. On this page, you will find tests, full specs, strengths, and weaknesses of each of the gadgets.

Key differences

An overview of the main advantages of each smartphone
Reasons to consider the Samsung Galaxy A51
  • Slow-motion recording at 960FPS
  • Ability to record video in 4K resolution
  • 15% better performance in AnTuTu Benchmark (176K versus 154K)
  • Faster storage type - UFS 2.0 versus eMMC 5.1
  • More energy-efficient CPU – Exynos 9 Octa 9611
  • The front-facing camera can record video at 4K
Reasons to consider the Samsung Galaxy A31
  • Shows 44% longer battery life (124 vs 86 hours)
  • Comes with 1000 mAh larger battery capacity: 5000 vs 4000 mAh

Review

Display
Screen quality, color accuracy, brightness
Performance
CPU/GPU performance in apps and games
Battery
Battery life, charging type and speed
Camera
Photo and video recording quality
Connectivity
Networks, ports, data transmission
NanoReview score
Final comparison evaluation

Value for money

You can enter your local price of these phones (in USD or any other currency) and click on the "Calculate" button to see which one has a better value for money.
Price

Tests and specifications

Comparison table of technical specifications and tests

Display

Type Super AMOLED Super AMOLED
Size 6.5 inches 6.4 inches
Resolution 1080 x 2400 pixels 1080 x 2400 pixels
Aspect ratio 20:9 20:9
PPI 405 ppi 411 ppi
Refresh rate 60 Hz 60 Hz
HDR support No No
Screen protection Corning Gorilla Glass 3 Tempered glass
Screen-to-body ratio 87.4% 84.9%
Display features - Always-On Display - Always-On Display
Display tests
RGB color space 98.8% 96.8%
PWM 242 Hz 238 Hz
Response time 25 ms 8 ms
Contrast ∞ Infinity ∞ Infinity
Max. Brightness
636 nits
642 nits
Sources: NotebookCheck [1], [2]

Design and build

Height 158.5 mm (6.24 inches) 159.3 mm (6.27 inches)
Width 73.6 mm (2.9 inches) 73.1 mm (2.88 inches)
Thickness 7.9 mm (0.31 inches) 8.6 mm (0.34 inches)
Weight 172 gramm (6.07 oz) 185 gramm (6.53 oz)
Waterproof No No
Rear material Plastic Plastic
Frame material Plastic Plastic
Colors White, Black White, Black, Blue, Red
Fingerprint scanner Yes, in-display Yes, in-display
Screen-to-body ratio
87.4%
84.9%

Performance

Tests of Samsung Galaxy A51 and Samsung Galaxy A31 in the benchmarks
SoC
Chipset Samsung Exynos 9 Octa 9611 Mediatek Helio P65
Max. clock 2300 MHz 2000 MHz
CPU cores 8 (4 + 4) 8 (2 + 6)
Architecture - 4 cores at 1.7 GHz: Cortex-A53
- 4 cores at 2.3 GHz: Cortex-A73
- 6 cores at 1.7 GHz: Cortex-A55
- 2 cores at 2 GHz: Cortex-A75
Lithography process 10 nanometers 12 nanometers
Graphics Mali-G72 MP3 Arm Mali-G52 2EEMC2
GPU clock 850 MHz 820 MHz
FLOPS ~259 GFLOPS ~56.4 GFLOPS
Memory
RAM size 4, 6 GB 4 GB
Memory type LPDDR4X LPDDR4X
Memory clock 1866 MHz 1866 MHz
Channels 2 2
Storage
Storage size 64, 128 GB 64, 128 GB
Storage type UFS 2.0 eMMC 5.1
Memory card MicroSD MicroSD
Memory card max. size Up to 512 GB Up to 512 GB

Benchmarks

Geekbench 5 (Single-Core)
353
Geekbench 5 (Multi-Core)
1300
1266
AnTuTu Benchmark 8
Galaxy A51 +15%
176513
154028

Software

Operating system Android 10 (Can be upgraded to Android 11) Android 10 (Can be upgraded to Android 11)
ROM One UI 3.0 One UI 3.1
OS size 23 GB 27 GB

Battery

Specifications
Capacity 4000 mAh 5000 mAh
Charge power 15 W 15 W
Battery type Li-Po Li-Ion
Replaceable No No
Wireless charging No No
Reverse charging No No
Fast charging Yes (40% in 35 min) Yes, Samsung Adaptive Fast Charge (50% in 60 min)
Full charging time 1:50 hr 2:25 hr

Battery life tests

Web browsing (Wi-Fi)
13:21 hr
Galaxy A31 +25%
16:54 hr
Watching videos (Player)
14:22 hr
Galaxy A31 +41%
20:01 hr
Talk (3G)
21:51 hr
Galaxy A31 +65%
35:56 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 48 megapixels 48 megapixels
Image resolution 8000 x 6000 8000 x 6000
Zoom Digital Digital
Flash LED LED
Stabilization Digital Digital
8K video recording No No
4K video recording Up to 30FPS No
1080p video recording Up to 120FPS Up to 30FPS
Slow motion 960 FPS (720p) No
Angle of widest lens 120° 123°
Lenses 4 (48 MP + 12 MP + 5 MP + 5 MP) 4 (48 MP + 8 MP + 5 MP + 5 MP)
Wide (main) lens - 48 MP
- Aperture: f/2.0
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/2", Samsung S5KGM2 (ISOCELL CMOS)
- Phase autofocus
- 48 MP
- Aperture: f/2.0
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/2.0", Samsung S5KGM2 (ISOCELL CMOS)
- Phase autofocus
Ultra-wide lens - 12 MP
- Aperture: f/2.2
- Focal length: 13 mm
- Pixel size: 1.12 micron
- 8 MP
- Aperture: f/2.2
- Focal length: 13 mm
- Pixel size: 1.12 micron
- Sensor: 1/4.0" (CMOS)
Macro lens - 5 MP
- Aperture: f/2.4
- Focal length: 40 mm
- Pixel size: 1.12 micron
- 5 MP
- Aperture: f/2.4
Depth lens - 5 MP
- Aperture: f/2.2
- Pixel size: 1.12 micron
- Sensor: 1/5.0" (CMOS)
- 5 MP
- Aperture: f/2.4
Camera features - Bokeh mode
- Pro mode
- Bokeh mode
- Pro mode
Selfie camera
Megapixels 32 megapixels 20 megapixels
Image resolution 6560 x 4928 5963 x 3354
Aperture f/2.2 f/2.2
Focal length 26 mm -
Pixel size 0.8 microns -
Sensor type ISOCELL CMOS CMOS
Sensor size 1/2.8" -
Video resolution 2160p (4K) при 30 FPS 1080p (Full HD) при 30 FPS

Connectivity

Wi-Fi standard Wi-Fi 5 (802.11 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
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
Network
Number of SIM* 2 2
Type of SIM card Nano Nano
Multi SIM mode Standby Standby
eSIM support* No No
Hybrid slot No No
LTE Cat* 12 12
5G support No No

Sound

Speakers Mono Mono
Headphone audio jack Yes Yes
FM radio Yes Yes
Dolby Atmos Yes Yes
Speakers test
Max. loudness
81.7 dB
78.5 dB

Other

Category Mid-range Mid-range
Announced December 2019 March 2020
Release date December 2019 April 2020
Launch price ~ 250 USD ~ 225 USD
SAR (head) 0.596 W/kg 0.49 W/kg
SAR (body) 1.45 W/kg 1.68 W/kg
Sensors - Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
- Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
*Disclaimer! NFC, GSM network support, and some other specs can be different depending on the country.

Conclusion

If the performance and camera are more important to you, then choose the Samsung Galaxy A51. But if the battery life is more of a priority – go for the Samsung Galaxy A31.

Cast your vote

So, which phone would you choose?
1083 (42.9%)
1440 (57.1%)
Total votes: 2523

User opinions

You can share your opinion or ask a question in the comments below
Avatar
Drew 28 April 2021 11:21
If you a bigggg camera man but don't care much about a really fast phone buy the the A51 If you want decent camera and performance get the A31.
+2 Reply