Xiaomi Redmi 9T vs Oppo Realme C21Y

Here we compared two budget smartphones: the 6.53-inch Xiaomi Redmi 9T (with Qualcomm Snapdragon 662) that was released on January 8, 2021, against the Oppo Realme C21Y, which is powered by Unisoc T610 and came out 6 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 9T
  • 46% higher pixel density (395 vs 270 PPI)
  • Comes with 1000 mAh larger battery capacity: 6000 vs 5000 mAh
  • Modern USB Type-C port
  • Compatible with Wi-Fi 5 wireless networks
  • Supports 18W fast charging
  • Stereo speakers
  • Delivers 9% higher maximum brightness (439 against 401 nits)
  • Has an ultra-wide angle camera lens
  • Slow-motion recording at 120FPS
  • Has a built-in infrared port
Reasons to consider the Oppo Realme C21Y
  • 14% faster in single-core GeekBench 5 test: 353 and 310 points
  • The phone is 6-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
Phone:
vs

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 3 Tempered glass
Screen-to-body ratio 83.4% 81.6%
Display tests
RGB color space 96.4% -
PWM 880 Hz -
Response time 42 ms -
Contrast 1868:1 -
Max. Brightness
Redmi 9T +9%
439 nits
401 nits
Sources: NotebookCheck [3]

Design and build

Height 162.3 mm (6.39 inches) 164.5 mm (6.48 inches)
Width 77.3 mm (3.04 inches) 76 mm (2.99 inches)
Thickness 9.6 mm (0.38 inches) 9.1 mm (0.36 inches)
Weight 198 gramm (6.98 oz) 200 gramm (7.05 oz)
Waterproof No No
Rear material Plastic Plastic
Frame material Plastic Plastic
Colors Gray, Blue, Green, Orange Black, Blue
Fingerprint scanner Yes, in home button Yes, rear
Screen-to-body ratio
Redmi 9T +2%
83.4%
81.6%

Performance

Tests of Xiaomi Redmi 9T and Oppo Realme C21Y in the benchmarks
SoC
Chipset Qualcomm Snapdragon 662 Unisoc T610
Max. clock 2000 MHz 1800 MHz
CPU cores 8 (4 + 4) 8 (2 + 6)
Architecture - 4 cores at 1.8 GHz: Kryo 260 Silver (Cortex-A53)
- 4 cores at 2 GHz: Kryo 260 Gold (Cortex-A73)
- 6 cores at 1.82 GHz: Cortex-A55
- 2 cores at 1.82 GHz: Cortex-A75
L3 cache - 1 MB
Lithography process 11 nanometers 12 nanometers
Graphics Adreno 610 ARM Mali G52 MP2
GPU clock 600 MHz 614 MHz
FLOPS ~272 GFLOPS ~71.2 GFLOPS
Memory
RAM size 4, 6 GB 3, 4 GB
Memory type LPDDR4X LPDDR4X
Memory clock 1800 MHz 1866 MHz
Channels 2 2
Storage
Storage size 64, 128 GB 32, 64 GB
Storage type UFS 2.2 eMMC 5.1
Memory card MicroSD MicroSD
Memory card max. size Up to 512 GB Up to 256 GB

Benchmarks

Geekbench 5 (Single-Core)
310
353
Geekbench 5 (Multi-Core)
Redmi 9T +7%
1408
AnTuTu Benchmark 9
Redmi 9T +4%
201865
194281
CPU 69124 66485
GPU 32823 32103
Memory 43460 37779
UX 54969 57506
Total score 201865 194281
3DMark Wild Life Performance
Stability 99% -
Graphics test 2 FPS -
Graphics score 370 -
PCMark 3.0 score 6245 -
Sources: 3DMark [3]

Software

Operating system Android 10 (Can be upgraded to Android 11) Android 11
ROM MIUI 12.5 Realme UI 2.0
OS size 21 GB -

Battery

Specifications
Capacity 6000 mAh 5000 mAh
Charge power 18 W 10 W
Battery type Li-Ion Li-Po
Replaceable No No
Wireless charging No No
Reverse charging Yes Yes
Fast charging Yes (25% in 30 min) No
Full charging time 2:30 hr 3:00 hr
Battery life tests
Web browsing 17:12 hr -
Watching video 15:38 hr -
Gaming 07:15 hr -
Standby 182 hr -
General battery life
47:23 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 120° -
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: 8 micron
- Sensor: 1/2", Samsung S5KGM1 (ISOCELL Plus CMOS)
- Phase autofocus
- 13 MP
- Aperture: f/2.2
- Focal length: 26 mm
- Sensor: 1/3.06" (CMOS)
- Phase autofocus
Ultra-wide lens - 8 MP
- Aperture: f/2.2
- Focal length: 13 mm
- Pixel size: 1.12 micron
- Sensor: 1/4.0", OmniVision OV8856
-
Macro lens - 2 MP
- Aperture: f/2.4
- Pixel size: 1.12 micron
- 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
Depth lens - 2 MP
- Aperture: f/2.4
- 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 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 5 (802.11 a/b/g/n/ac) 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 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 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* 13 7
5G support No No

Sound

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

Other

Category Budget Budget
Announced January 2021 June 2021
Release date January 2021 July 2021
SAR (head) 0.6 W/kg -
SAR (body) 0.81 W/kg -
Sensors - Proximity sensor
- 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 9T is definitely a better buy.

Cast your vote

So, which phone would you choose?
21 (56.8%)
16 (43.2%)
Total votes: 37

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