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Oppo Realme C21 vs Realme C15

Here we compared two budget smartphones: the 6.5-inch Oppo Realme C21 (with MediaTek Helio G35) that was released on March 5, 2021, against the Oppo Realme C15, which is powered by the same chip and came out 7 months before. 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 C21
  • Uses a faster type of memory: LPDDR4X 1866 MHz
  • Slow-motion recording at 60FPS
  • Reverse charging feature
  • The phone is 7-months newer
  • Weighs 19 grams less
Reasons to consider the Oppo Realme C15
  • Comes with 1000 mAh larger battery capacity: 6000 vs 5000 mAh
  • Supports 18W fast charging
  • Has an ultra-wide angle camera lens

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 6.5 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 60 Hz 60 Hz
HDR support No No
Screen protection Tempered glass Corning Gorilla Glass
Screen-to-body ratio 80.8% 81.7%
Max. Brightness
450 nits
424 nits

Design and build

Height 165.2 mm (6.5 inches) 164.5 mm (6.48 inches)
Width 76.4 mm (3.01 inches) 75.9 mm (2.99 inches)
Thickness 8.9 mm (0.35 inches) 9.8 mm (0.39 inches)
Weight 190 gramm (6.7 oz) 209 gramm (7.37 oz)
Waterproof No No
Rear material Plastic Plastic
Frame material Plastic Plastic
Colors Black, Blue Silver, Blue
Fingerprint scanner Yes, rear Yes, rear
Screen-to-body ratio
80.8%
81.7%

Performance

Tests of Oppo Realme C21 and Oppo Realme C15 in the benchmarks
SoC
Chipset MediaTek Helio G35 MediaTek Helio G35
Max. clock 2300 MHz 2300 MHz
CPU cores 8 (8) 8 (8)
Architecture - 8 cores at 2.3 GHz: Cortex-A53 - 8 cores at 2.3 GHz: Cortex-A53
Lithography process 12 nanometers 12 nanometers
Graphics IMG PowerVR GE8320 IMG PowerVR GE8320
GPU clock 680 MHz 680 MHz
FLOPS ~54.4 GFLOPS ~54.4 GFLOPS
Memory
RAM size 3, 4 GB 4 GB
Memory type LPDDR4X LPDDR4
Memory clock 1866 MHz -
Channels 2 2
Storage
Storage size 32, 64 GB 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)
178
Geekbench 5 (Multi-Core)
1027
AnTuTu Benchmark 8
115805
113671

Software

Operating system Android 10 Android 10
ROM Realme UI 1.0 Realme UI 1.0

Battery

Specifications
Capacity 5000 mAh 6000 mAh
Charge power 10 W 18 W
Battery type Li-Po Li-Po
Replaceable No No
Wireless charging No No
Reverse charging Yes No
Fast charging No Yes (45% in 60 min)
Full charging time 2:55 hr 2:45 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 13 megapixels 13 megapixels
Image resolution 4128 x 3096 4160 x 3120
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 30 FPS (720p)
Angle of widest lens - 119°
Lenses 3 (13 MP + 2 MP + 2 MP) 4 (13 MP + 8 MP + 2 MP + 2 MP)
Wide (main) lens - 13 MP
- Aperture: f/2.2
- Focal length: 26 mm
- Pixel size: 1.12 micron
- Sensor: 1/3" (CMOS)
- Phase autofocus
- 13 MP
- Aperture: f/2.2
- Pixel size: 1.12 micron
- Sensor: 1/3" (CMOS)
- Phase autofocus
Ultra-wide lens - - 8 MP
- Aperture: f/2.3
- Pixel size: 1.12 micron
- Sensor: 1/4" (CMOS)
Monochrome lens - 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
- Sensor: 1/5" (CMOS)
- 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
- Sensor: 1/5" (CMOS)
Macro lens - 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
- Sensor: 1/5" (CMOS)
-
Depth lens - - 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
- Sensor: 1/5" (CMOS)
Camera features - Bokeh mode - Bokeh mode
- Pro mode
Selfie camera
Megapixels 5 megapixels 8 megapixels
Image resolution 2560 x 1960 3264 x 2448
Aperture f/2.2 f/2.0
Focal length 27 mm -
Pixel size 1.12 microns 1.12 microns
Sensor type CMOS CMOS
Sensor size 1/5" 1/4"
Video resolution 1080p (Full HD) при 30 FPS 1080p (Full HD) при 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 Display
Bluetooth version 5 5
Bluetooth features LE, HID, A2DP LE, A2DP
USB type Micro USB Micro USB
USB version 2 2
USB features - Charging
- USB-Storage mode
- OTG
- Charging
- USB-Storage mode
- OTG
GPS GPS, GLONASS, Beidou 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* 7 7
5G support No No

Sound

Speakers Mono Mono
Headphone audio jack Yes Yes
FM radio Yes Yes
Dolby Atmos No No

Other

Category Budget Budget
Announced March 2021 July 2020
Release date March 2021 September 2020
Launch price ~ 125 USD ~ 162 USD
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

If the battery life and camera are more important to you, then choose the Oppo Realme C15. But if the design is more of a priority – go for the Oppo Realme C21.

Cast your vote

So, which phone would you choose?
21 (32.3%)
44 (67.7%)
Total votes: 65

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