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Samsung Galaxy M31 vs Galaxy M21

Here we compared two smartphones: the 6.4-inch Samsung Galaxy M31 (with Exynos 7 Octa 9611) that was released on February 25, 2020, against the Samsung Galaxy M21, which is powered by the same chip. 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 M31
  • Has 50% more RAM: 6GB versus 4GB
  • The front-facing camera can record video at 4K

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 6.4 inches 6.4 inches
Resolution 1080 x 2340 pixels 1080 x 2340 pixels
Aspect ratio 19.5:9 19.5:9
PPI 403 ppi 403 ppi
Refresh rate 60 Hz 60 Hz
HDR support Yes, HDR10 No
Screen protection Corning Gorilla Glass 3 Corning Gorilla Glass 3
Screen-to-body ratio 84% 84.2%
Display features - Always-On Display - Always-On Display
Display tests
RGB color space 142% 141.3%
PWM 208 Hz 215 Hz
Response time 8.5 ms 9 ms
Contrast ∞ Infinity ∞ Infinity
Max. Brightness
608 nits
604 nits
Sources: NotebookCheck [1], [2]

Design and build

Height 159.2 mm (6.27 inches) 159 mm (6.26 inches)
Width 75.1 mm (2.96 inches) 75.1 mm (2.96 inches)
Thickness 8.9 mm (0.35 inches) 8.9 mm (0.35 inches)
Weight 191 gramm (6.74 oz) 188 gramm (6.63 oz)
Waterproof No No
Rear material Plastic Plastic
Frame material Plastic Plastic
Colors Black, Blue, Red Black, Blue, Green
Fingerprint scanner Yes, rear Yes, rear
Screen-to-body ratio

Performance

Tests of Samsung Galaxy M31 and Samsung Galaxy M21 in the benchmarks
SoC
Chipset Samsung Exynos 7 Octa 9611 Samsung Exynos 7 Octa 9611
Max. clock 2300 MHz 2300 MHz
CPU cores 8 (4 + 4) 8 (4 + 4)
Architecture - 4 cores at 1.7 GHz: Cortex-A53
- 4 cores at 2.3 GHz: Cortex-A73
- 4 cores at 1.7 GHz: Cortex-A53
- 4 cores at 2.3 GHz: Cortex-A73
Lithography process 10 nanometers 10 nanometers
Graphics Mali-G72 MP3 Mali-G72 MP3
GPU clock 850 MHz 850 MHz
FLOPS ~259 GFLOPS ~259 GFLOPS
Memory
RAM size 6 GB 4 GB
Memory type LPDDR4X LPDDR4X
Memory clock 1866 MHz 1866 MHz
Channels 2 2
Storage
Storage size 128 GB 64 GB
Storage type UFS 2.1 UFS 2.1
Memory card MicroSD MicroSD
Memory card max. size Up to 512 GB Up to 512 GB

Benchmarks

Geekbench 5 (Single-Core)
344
Geekbench 5 (Multi-Core)
1225
1331
AnTuTu Benchmark 7
108578
107992
AnTuTu Benchmark 8
184381
176270

Software

Operating system Android 10 (Can be upgraded to Android 11) Android 10.0 (Can be upgraded to Android 11.0)
ROM One UI 3.1 One UI 3.1 Core
OS size 15 GB 14.5 GB

Battery

Specifications
Capacity 6000 mAh 6000 mAh
Charge power 15 W 15 W
Battery type Li-Ion Li-Ion
Replaceable No No
Wireless charging No No
Reverse charging No No
Fast charging Yes, Samsung Adaptive Fast Charge (45% in 60 min) Yes, Samsung Adaptive Fast Charge (25% in 30 min)
Full charging time 2:25 hr 2:35 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 64 megapixels 48 megapixels
Image resolution 9248 x 6920 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 30FPS
Slow motion 240 FPS (720p) 240 FPS (720p)
Angle of widest lens 123° 123°
Lenses 4 (64 MP + 8 MP + 5 MP + 5 MP) 3 (48 MP + 8 MP + 5 MP)
Wide (main) lens - 64 MP
- Aperture: f/1.8
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/1.72", ISOCELL Bright GW1 (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 - 8 MP
- Aperture: f/2.2
- Focal length: 12 mm
- Pixel size: 1.12 micron
- Sensor: 1/4.0" (CMOS)
- 8 MP
- Aperture: f/2.2
- Focal length: 12 mm
- Pixel size: 1.12 micron
- Sensor: 1/4.0" (CMOS)
Macro lens - 5 MP
- Aperture: f/2.2
-
Depth lens - 5 MP
- Aperture: f/2.2
- Pixel size: 1.12 micron
- Sensor: 1/5.0" (CMOS)
- 5 MP
- Aperture: f/2.2
- Focal length: 25 mm
- Pixel size: 1.12 micron
- Sensor: 1/5.0" (CMOS)
Camera features - Bokeh mode
- Pro mode
- Bokeh mode
- Pro mode
Selfie camera
Megapixels 32 megapixels 20 megapixels
Image resolution 6528 x 4896 5184 x 3888
Aperture f/2.0 f/2.0
Focal length 26 mm 26 mm
Pixel size 0.8 microns -
Sensor type 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 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
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
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
83.8 dB

Other

Category Mid-range Budget
Announced February 2020 March 2020
Release date March 2020 March 2020
Launch price ~ 250 USD ~ 200 USD
SAR (head) 0.48 W/kg 0.492 W/kg
SAR (body) 1.13 W/kg 1.13 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

These smartphones have a lot in common, but we would recommend the Samsung Galaxy M31.

Cast your vote

So, which phone would you choose?
278 (30.1%)
645 (69.9%)
Total votes: 923

User opinions

You can share your opinion or ask a question in the comments below
Avatar
Whiplash 19 July 2021 12:01
Many people report AMOLED burn-in & purple spot (cell damage) on Galaxy M21 - in India & Bangladesh - mfg in 2020 & early 2021. As it looks like M21 & M31 use different PWM frequencies & also vertical height is a bit different both are not using same display. Also M31 display is HDR certified apparently. And that Samsung service centers have taken money from them citing user damage or alleged water damage. It is to be noted that obviously service centers have not opened the sets in front of the customer while checking liquid damage indicator stickers & they themselves can put a drop of water on them.
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