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Samsung Galaxy A51 vs Galaxy A42

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 A42, which is powered by Qualcomm Snapdragon 750 5G and came out 9 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
  • 52% higher pixel density (405 vs 266 PPI)
  • Delivers 11% higher maximum brightness (634 against 570 nits)
  • Slow-motion recording at 960FPS
  • Weighs 21 grams less
  • The front-facing camera can record video at 4K
Reasons to consider the Samsung Galaxy A42
  • Shows 67% longer battery life (144 vs 86 hours)
  • 73% better performance in AnTuTu Benchmark (323K versus 186K)
  • Comes with 1000 mAh larger battery capacity: 5000 vs 4000 mAh
  • Faster storage type - UFS 2.1 versus UFS 2.0
  • More energy-efficient CPU – Snapdragon 750 5G
  • 86% faster in single-core GeekBench 5 test: 639 and 344 points
  • The phone is 9-months newer

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 6.6 inches
Resolution 1080 x 2400 pixels 720 x 1600 pixels
Aspect ratio 20:9 20:9
PPI 405 ppi 266 ppi
Refresh rate 60 Hz 60 Hz
HDR support No No
Screen protection Corning Gorilla Glass 3 Corning Gorilla Glass 3
Screen-to-body ratio 87.4% 84.3%
Display features - Always-On Display - Always-On Display
Display tests
RGB color space 98.8% 97.7%
PWM 242 Hz 242 Hz
Response time 25 ms 9.5 ms
Contrast ∞ Infinity ∞ Infinity
Max. Brightness
Galaxy A51 +11%
634 nits
570 nits
Sources: NotebookCheck [1], [2]

Design and build

Height 158.5 mm (6.24 inches) 164.4 mm (6.47 inches)
Width 73.6 mm (2.9 inches) 75.9 mm (2.99 inches)
Thickness 7.9 mm (0.31 inches) 8.6 mm (0.34 inches)
Weight 172 gramm (6.07 oz) 193 gramm (6.81 oz)
Waterproof No No
Rear material Plastic Plastic
Frame material Plastic Plastic
Colors White, Black White, Black, Gray
Fingerprint scanner Yes, in-display Yes, in-display
Screen-to-body ratio
87.4%
84.3%

Performance

Tests of Samsung Galaxy A51 and Samsung Galaxy A42 in the benchmarks
SoC
Chipset Samsung Exynos 9 Octa 9611 Qualcomm Snapdragon 750 5G
Max. clock 2300 MHz 2200 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 1.8 GHz: Kryo 570 Silver (Cortex-A55)
- 2 cores at 2.2 GHz: Kryo 570 Gold (Cortex-A77)
Lithography process 10 nanometers 8 nanometers
Graphics Mali-G72 MP3 Adreno 619
GPU clock 850 MHz 950 MHz
FLOPS ~259 GFLOPS -
Memory
RAM size 4, 6 GB 4, 6, 8 GB
Memory type LPDDR4X LPDDR4X
Memory clock 1866 MHz 1866 MHz
Channels 2 2
Storage
Storage size 64, 128 GB 128 GB
Storage type UFS 2.0 UFS 2.1
Memory card MicroSD MicroSD
Memory card max. size Up to 512 GB Up to 512 GB

Benchmarks

Geekbench 5 (Single-Core)
Galaxy A42 +86%
639
Geekbench 5 (Multi-Core)
1287
Galaxy A42 +47%
1895
AnTuTu Benchmark 7
111842
AnTuTu Benchmark 8
186796
Galaxy A42 +73%
323629

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 20 GB

Battery

Specifications
Capacity 4000 mAh 5000 mAh
Charge power 15 W 15 W
Battery type Li-Po Li-Po
Replaceable No No
Wireless charging No No
Reverse charging No No
Fast charging Yes (40% in 35 min) Yes (27% in 30 min)
Full charging time 1:50 hr 2:01 hr

Battery life tests

Web browsing (Wi-Fi)
13:21 hr
Galaxy A42 +45%
19:12 hr
Watching videos (Player)
14:22 hr
Galaxy A42 +70%
24:11 hr
Talk (3G)
21:51 hr
Galaxy A42 +91%
41:19 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 Up to 30FPS
1080p video recording Up to 30FPS Up to 60FPS
Slow motion 960 FPS (720p) 480 FPS (720p)
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/1.8
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/2", 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
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/2.2
Camera features - Bokeh mode
- Pro mode
- Bokeh mode
- Pro mode
Selfie camera
Megapixels 32 megapixels 20 megapixels
Image resolution 6560 x 4928 5184 x 3880
Aperture f/2.2 f/2.2
Focal length 26 mm -
Pixel size 0.8 microns 1 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 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
Network
Number of SIM* 2 2
Type of SIM card Nano Nano
Multi SIM mode Standby Standby
eSIM support* No No
Hybrid slot No Yes
LTE Cat* 12 18
5G support No Yes

Sound

Speakers Mono Mono
Headphone audio jack Yes Yes
FM radio Yes No
Dolby Atmos Yes Yes
Speakers test
Max. loudness
81.7 dB
82.9 dB

Other

Category Mid-range Mid-range
Announced December 2019 September 2020
Release date December 2019 November 2020
Launch price ~ 250 USD ~ 338 USD
SAR (head) 0.596 W/kg 1.15 W/kg
SAR (body) 1.45 W/kg 1.33 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

After analyzing all the data, we think that the Samsung Galaxy A42 is definitely a better buy.

Cast your vote

So, which phone would you choose?
29 (28.7%)
72 (71.3%)
Total votes: 101

User opinions

You can share your opinion or ask a question in the comments below
Avatar
Chuck 11 May 2021 20:38
An extremely well-done research report, Exactly what I was looking for. Thank you
+1 Reply