Samsung Galaxy M12 vs Oppo Realme C21Y

Here we compared two budget smartphones: the 6.5-inch Samsung Galaxy M12 (with Exynos 850) that was released on November 24, 2020, against the Oppo Realme C21Y, which is powered by Unisoc T610 and came out 7 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 M12
  • Higher display refresh rate – 90 Hz
  • Modern USB Type-C port
  • Supports 15W fast charging
  • More energy-efficient CPU – Exynos 850
  • Has an ultra-wide angle camera lens
  • More recent OS version: Android 12 versus 11
  • Supports Dolby Atmos sound technology
Reasons to consider the Oppo Realme C21Y
  • 31% better performance in AnTuTu Benchmark (193K versus 147K)
  • Reverse charging feature
  • 2x faster in single-core GeekBench 5 test: 349 and 178 points
  • The phone is 7-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 PLS TFT IPS LCD
Size 6.5 inches 6.5 inches
Resolution 720 x 1600 pixels 720 x 1600 pixels
Aspect ratio 20:9 20:9
PPI 270 ppi 270 ppi
Refresh rate 90 Hz 60 Hz
Max rated brightness 450 nits 400 nits
HDR support No No
Screen protection Tempered glass Tempered glass
Screen-to-body ratio 81.9% 81.6%
Display tests
RGB color space 93.3% -
Response time 39 ms -
Contrast 926:1 -
Peak brightness test (auto)
426 nits
Sources: NotebookCheck [3]

Design and build

Height 164 mm (6.46 inches) 164.5 mm (6.48 inches)
Width 75.9 mm (2.99 inches) 76 mm (2.99 inches)
Thickness 9.7 mm (0.38 inches) 9.1 mm (0.36 inches)
Weight 214 gramm (7.55 oz) 200 gramm (7.05 oz)
Waterproof No No
Rear material Plastic Plastic
Frame material Plastic Plastic
Colors Black, Blue, Green Black, Blue
Fingerprint scanner Yes, in home button Yes, rear
Screen-to-body ratio
81.9%
81.6%

Performance

Tests of Samsung Galaxy M12 and Oppo Realme C21Y in the benchmarks
SoC
Chipset Samsung Exynos 850 Unisoc T610
Max. clock 2000 MHz 1800 MHz
CPU cores 8 (8) 8 (2 + 6)
Architecture - 8 cores at 2 GHz: Cortex-A55 - 6 cores at 1.82 GHz: Cortex-A55
- 2 cores at 1.82 GHz: Cortex-A75
L3 cache - 1 MB
Lithography process 8 nanometers 12 nanometers
Graphics Mali-G52 MP1 ARM Mali G52 MP2
GPU clock 680 MHz 614 MHz
FLOPS ~126 GFLOPS ~71.2 GFLOPS
Memory
RAM size 3, 4 GB 3, 4 GB
Memory type LPDDR4X LPDDR4X
Memory clock 1866 MHz 1866 MHz
Channels 2 2
Storage
Storage size 32, 64, 128 GB 32, 64 GB
Storage type eMMC 5.1 eMMC 5.1
Memory card MicroSD MicroSD
Memory card max. size Up to 1024 GB Up to 256 GB

Benchmarks

Geekbench 5 (Single-Core)
349
Geekbench 5 (Multi-Core)
1037
1301
AnTuTu Benchmark 9
147737
193264
CPU 44756 66485
GPU 24822 32103
Memory 36022 37779
UX 42192 57506
Total score 147737 193264
3DMark Wild Life Performance
Stability 98% -
Graphics test 2 FPS -
Graphics score 427 -
PCMark 3.0 score 6062 -
Sources: 3DMark [3]

Software

Operating system Android 11 (Can be upgraded to Android 12) Android 11
ROM One UI Core 4.1 Realme UI 2.0
OS size 14 GB -

Battery

Specifications
Capacity 5000 mAh 5000 mAh
Charge power 15 W 10 W
Battery type Li-Ion Li-Po
Replaceable No No
Wireless charging No No
Reverse charging No Yes
Fast charging Yes (40% in 60 min) No
Full charging time 2:30 hr 3:00 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 48 megapixels 13 megapixels
Image resolution 8000 x 6000 4128 x 3096
Zoom Digital Digital
Flash LED LED
Stabilization Digital Digital
8K video recording No No
4K video recording No No
1080p video recording Up to 30FPS Up to 30FPS
Slow motion No No
Angle of widest lens 123° -
Lenses 4 (48 MP + 5 MP + 2 MP + 2 MP) 3 (13 MP + 2 MP + 2 MP)
Wide (main) lens - 48 MP
- Aperture: f/2.0
- Pixel size: 0.8 micron
- Sensor: 1/2", Samsung S5KGM2 (CMOS)
- Phase autofocus
- 13 MP
- Aperture: f/2.2
- Focal length: 26 mm
- Sensor: 1/3.06" (CMOS)
- Phase autofocus
Ultra-wide lens - 5 MP
- Aperture: f/2.2
- Pixel size: 1.12 micron
- Sensor: 1/5.0" (CMOS)
-
Macro lens - 2 MP
- Aperture: f/2.4
- 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
Depth lens - 2 MP
- Aperture: f/2.2
- 2 MP
- Aperture: f/2.4
Camera features - Bokeh mode
- Pro mode
- Bokeh mode
Selfie camera
Megapixels 8 megapixels 5 megapixels
Image resolution 3264 x 2448 2560 x 1960
Aperture f/2.0 f/2.2
Focal length - 27 mm
Pixel size - 1.12 microns
Sensor type CMOS CMOS
Sensor size - 1/5"
Video resolution 1080p (Full HD) at 30 FPS 1080p (Full HD) at 30 FPS

Connectivity

Wi-Fi standard Wi-Fi 4 (802.11 b/g/n) Wi-Fi 4 (802.11 a/b/g/n)
Wi-Fi features - Wi-Fi Direct
- Wi-Fi Hotspot
- 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 LE, HID, A2DP
USB type USB Type-C Micro USB
USB version 2 2
USB features - Charging
- USB-Storage mode
- OTG
- Charging
- USB-Storage mode
GPS GPS, GLONASS, Beidou, Galileo GPS, GLONASS, Beidou
NFC* Yes No
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* 7 7
5G support No No

Sound

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

Other

Category Budget Budget
Announced November 2020 June 2021
Release date April 2021 July 2021
SAR (head) 0.54 W/kg -
SAR (body) 1.39 W/kg -
Sensors - Proximity sensor
- Accelerometer
- Ambient light sensor
- Fingerprint
- Proximity sensor
- 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 display, software, battery life, camera, connectivity, and sound are more important to you, then choose the Samsung Galaxy M12. But if the performance is more of a priority – go for the Oppo Realme C21Y.

Cast your vote

So, which phone would you choose?
21 (63.6%)
12 (36.4%)
Total votes: 33

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