Xiaomi Redmi 9AT vs Oppo Realme C21Y

Here we compared two budget smartphones: the 6.53-inch Xiaomi Redmi 9AT (with MediaTek Helio G25) that was released on September 9, 2020, against the Oppo Realme C21Y, which is powered by Unisoc T610 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 Oppo Realme C21Y
  • 80% better performance in AnTuTu Benchmark (192K versus 106K)
  • Fingerprint scanner
  • More recent OS version: Android 11 versus 10
  • 2.6x faster in single-core GeekBench 5 test: 349 and 132 points
  • Reverse charging feature
  • 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 IPS LCD IPS LCD
Size 6.53 inches 6.5 inches
Resolution 720 x 1600 pixels 720 x 1600 pixels
Aspect ratio 20:9 20:9
PPI 269 ppi 270 ppi
Refresh rate 60 Hz 60 Hz
Max rated brightness 400 nits 400 nits
HDR support No No
Screen protection Tempered glass Tempered glass
Screen-to-body ratio 81.1% 81.6%
Display tests
RGB color space 92.6% -
Response time 45.5 ms -
Contrast 813:1 -
Peak brightness test (auto)
344 nits
Sources: NotebookCheck [3]

Design and build

Height 164.9 mm (6.49 inches) 164.5 mm (6.48 inches)
Width 77 mm (3.03 inches) 76 mm (2.99 inches)
Thickness 9 mm (0.35 inches) 9.1 mm (0.36 inches)
Weight 194 gramm (6.84 oz) 200 gramm (7.05 oz)
Waterproof No No
Rear material Plastic Plastic
Frame material Plastic Plastic
Colors Gray, Blue, Green Black, Blue
Fingerprint scanner No Yes, rear
Screen-to-body ratio
81.1%
81.6%

Performance

Tests of Xiaomi Redmi 9AT and Oppo Realme C21Y in the benchmarks
SoC
Chipset MediaTek Helio G25 Unisoc T610
Max. clock 2000 MHz 1800 MHz
CPU cores 8 (4 + 4) 8 (2 + 6)
Architecture - 4 cores at 1.5 GHz: Cortex-A53
- 4 cores at 2 GHz: Cortex-A53
- 6 cores at 1.82 GHz: Cortex-A55
- 2 cores at 1.82 GHz: Cortex-A75
L3 cache - 1 MB
Lithography process 12 nanometers 12 nanometers
Graphics IMG PowerVR GE8320 ARM Mali G52 MP2
GPU clock 650 MHz 614 MHz
FLOPS ~41.8 GFLOPS ~71.2 GFLOPS
Memory
RAM size 2 GB 3, 4 GB
Memory type LPDDR4X LPDDR4X
Memory clock 2133 MHz 1866 MHz
Channels 2 2
Storage
Storage size 32 GB 32, 64 GB
Storage type eMMC 5.1 eMMC 5.1
Memory card MicroSD MicroSD
Memory card max. size Up to 256 GB Up to 256 GB

Benchmarks

Geekbench 5 (Single-Core)
132
Realme C21Y +164%
349
Geekbench 5 (Multi-Core)
464
Realme C21Y +180%
1299
AnTuTu Benchmark 9
106648
192239
CPU - 66485
GPU - 32103
Memory - 37779
UX - 57506
Total score 106648 192239

Software

Operating system Android 10 Android 11
ROM MIUI 12 Realme UI 2.0
OS size 9 GB -

Battery

Specifications
Capacity 5000 mAh 5000 mAh
Charge power 10 W 10 W
Battery type Li-Po Li-Po
Replaceable No No
Wireless charging No No
Reverse charging No Yes
Fast charging No No
Full charging time 3:00 hr 3:00 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 13 megapixels 13 megapixels
Image resolution 4128 x 3096 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
Lenses 1 (13 MP) 3 (13 MP + 2 MP + 2 MP)
Wide (main) lens - 13 MP
- Aperture: f/2.2
- Focal length: 28 mm
- Pixel size: 1 micron
- Phase autofocus
- 13 MP
- Aperture: f/2.2
- Focal length: 26 mm
- Sensor: 1/3.06" (CMOS)
- Phase autofocus
Macro lens - - 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
Depth lens - - 2 MP
- Aperture: f/2.4
Camera features - - Bokeh mode
Selfie camera
Megapixels 5 megapixels 5 megapixels
Image resolution 2560 x 1960 2560 x 1960
Aperture f/2.2 f/2.2
Focal length - 27 mm
Pixel size 1.12 microns 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 a/b/g/n) Wi-Fi 4 (802.11 a/b/g/n)
Wi-Fi features - 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 Micro USB 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* No 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* 4 7
5G support No No

Sound

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

Other

Category Budget Budget
Announced September 2020 June 2021
Release date September 2020 July 2021
SAR (head) 0.78 W/kg -
SAR (body) 1.03 W/kg -
Sensors - Proximity sensor
- Accelerometer
- Ambient light sensor
- Compass
- 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 Oppo Realme C21Y is definitely a better buy.

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