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Xiaomi Redmi Note 9 vs Oppo Realme C21

Here we compared two smartphones: the 6.53-inch Xiaomi Redmi Note 9 (with MediaTek Helio G85) that was released on April 30, 2020, against the Oppo Realme C21, which is powered by MediaTek Helio G35 and came out 10 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 Xiaomi Redmi Note 9
  • 81% better performance in AnTuTu Benchmark (205K versus 113K)
  • 46% higher pixel density (395 vs 270 PPI)
  • Modern USB Type-C port
  • Compatible with Wi-Fi 5 wireless networks
  • Supports 18W fast charging
  • Has an ultra-wide angle camera lens
  • Slow-motion recording at 120FPS
  • 2.2x faster in single-core GeekBench 5 test: 369 and 171 points
  • Has a built-in infrared port
Reasons to consider the Oppo Realme C21
  • The phone is 10-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 IPS LCD IPS LCD
Size 6.53 inches 6.5 inches
Resolution 1080 x 2340 pixels 720 x 1600 pixels
Aspect ratio 19.5:9 20:9
PPI 395 ppi 270 ppi
Refresh rate 60 Hz 60 Hz
HDR support No No
Screen protection Corning Gorilla Glass 5 Tempered glass
Screen-to-body ratio 83.5% 80.8%
Display tests
RGB color space 97.7% -
PWM Not detected -
Response time 32.2 ms -
Contrast 4608:1 -
Max. Brightness
465 nits
449 nits
Sources: NotebookCheck [1]

Design and build

Height 162.3 mm (6.39 inches) 165.2 mm (6.5 inches)
Width 77.2 mm (3.04 inches) 76.4 mm (3.01 inches)
Thickness 8.9 mm (0.35 inches) 8.9 mm (0.35 inches)
Weight 199 gramm (7.02 oz) 190 gramm (6.7 oz)
Waterproof No No
Rear material Plastic Plastic
Frame material Plastic Plastic
Colors White, Gray, Green Black, Blue
Fingerprint scanner Yes, rear Yes, rear
Screen-to-body ratio
83.5%
80.8%

Performance

Tests of Xiaomi Redmi Note 9 and Oppo Realme C21 in the benchmarks
SoC
Chipset MediaTek Helio G85 MediaTek Helio G35
Max. clock 2000 MHz 2300 MHz
CPU cores 8 (2 + 6) 8 (8)
Architecture - 6 cores at 1.8 GHz: Cortex-A55
- 2 cores at 2 GHz: Cortex-A75
- 8 cores at 2.3 GHz: Cortex-A53
Lithography process 12 nanometers 12 nanometers
Graphics Mali-G52 MP2 IMG PowerVR GE8320
GPU clock 1000 MHz 680 MHz
FLOPS ~54 GFLOPS ~54.4 GFLOPS
Memory
RAM size 3, 4 GB 3, 4 GB
Memory type LPDDR4X LPDDR4X
Memory clock 2133 MHz 1866 MHz
Channels 2 2
Storage
Storage size 64, 128 GB 32, 64 GB
Storage type eMMC 5.1 eMMC 5.1
Memory card MicroSD MicroSD
Memory card max. size Up to 512 GB Up to 256 GB

Benchmarks

Geekbench 5 (Single-Core)
Redmi Note 9 +116%
369
Geekbench 5 (Multi-Core)
1285
AnTuTu Benchmark 8
205776
113883

Software

Operating system Android 10 Android 10
ROM MIUI 12 Realme UI 1.0
OS size 16.5 GB -

Battery

Specifications
Capacity 5020 mAh 5000 mAh
Charge power 18 W 10 W
Battery type Li-Po Li-Po
Replaceable No No
Wireless charging No No
Reverse charging Yes Yes
Fast charging Yes (50% in 40 min) No
Full charging time 1:30 hr 2:55 hr

Battery life tests

Web browsing (Wi-Fi)
18:00 hr
Watching videos (Player)
18:09 hr
Talk (3G)
34:52 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 120 FPS (720p) No
Angle of widest lens 118° -
Lenses 4 (48 MP + 8 MP + 2 MP + 2 MP) 3 (13 MP + 2 MP + 2 MP)
Wide (main) lens - 48 MP
- Aperture: f/1.8
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/2.0", Samsung S5KGM1 (ISOCELL Plus CMOS)
- Phase autofocus
- 13 MP
- Aperture: f/2.2
- Focal length: 26 mm
- Pixel size: 1.12 micron
- Sensor: 1/3" (CMOS)
- Phase autofocus
Ultra-wide lens - 8 MP
- Aperture: f/2.2
- Pixel size: 1.12 micron
- Sensor: 1/4.0" (CMOS)
-
Monochrome lens - - 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
- Sensor: 1/5" (CMOS)
Macro lens - 2 MP
- Aperture: f/2.4
- 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
- Sensor: 1/5" (CMOS)
Depth lens - 2 MP
- Aperture: f/2.4
-
Camera features - Bokeh mode
- Pro mode
- Bokeh mode
Selfie camera
Megapixels 13 megapixels 5 megapixels
Image resolution 4128 x 3096 2560 x 1960
Aperture f/2.3 f/2.2
Focal length 29 mm 27 mm
Pixel size 1.12 microns 1.12 microns
Sensor type CMOS CMOS
Sensor size 1/3.1" 1/5"
Video resolution 1080p (Full HD) 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 4 (802.11 a/b/g/n)
Wi-Fi features - Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5 5
Bluetooth features LE, HID, 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
- OTG
GPS GPS, GLONASS, Beidou, Galileo GPS, GLONASS, Beidou
NFC* Yes No
Infrared port Yes 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 7
5G support No No

Sound

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

Other

Category Mid-range Budget
Announced April 2020 March 2021
Release date June 2020 March 2021
Launch price ~ 212 USD ~ 125 USD
SAR (head) 0.8 W/kg -
SAR (body) 1.14 W/kg -
Sensors - Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- 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

After analyzing all the data, we think that the Xiaomi Redmi Note 9 is definitely a better buy.

Cast your vote

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Total votes: 2

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