OnePlus 3 vs. Realme C21

Phone Comparison, Reviews and Tests

In depth comparison and review of OnePlus 3 and Realme C21. Compare sizes, cameras, batteries, memory, and other important specifications and features to easily choose the right phone for you. Our goal is to help you uncover differences between the products and find the phone that will best fit your needs.

Phone Specifications Comparison

OnePlus 3 vs. Realme C21 Comparison Chart
DESIGN AND DIMENSIONS OnePlus 3 Realme C21
Product Type Smartphone Smartphone
Form Factor Touch Touch
Height 152.7 mm 165.2 mm Realme C21 has greater height than OnePlus 3.
Width 74.7 mm 76.4 mm Realme C21 has greater width than OnePlus 3.
Depth 7.4 mm 8.9 mm OnePlus 3 is narrower than OnePlus 3.
Weight 158 g 190 g OnePlus 3 is lighter than OnePlus 3.
Body Colour - Cross black | Cross blue
Body Material Anodised aluminium -
Waterproof (Water-resistant) - -
SAR Value 0.645 W/kg (body), 0.995 W/kg (head) -
Connector Type Headset jack - mini-phone 3.5mm
USB Type-C - 24 pin USB-C
Micro-USB
Headset jack - mini-phone 3.5mm
SIM Card Type (Size) Nano SIM Nano SIM
SIM Card Qty Dual-SIM Dual-SIM
DISPLAY OnePlus 3 Realme C21
Display Type OLED display LCD display
Display Technology Optic AMOLED LCD
Screen Size (Display Size) 5.5" 6.5" Realme C21 has larger screen size than OnePlus 3.
Screen Resolution (Display Resolution) 1920 x 1080 pixels 1600 x 720 pixels OnePlus 3 has better screen resolution than Realme C21.
Display Format Full HD HD+
Pixel Density 401 ppi -
Aspect Ratio - 20:9
Max Brightness - 420 cd/m²
Colour Depth 16.7 million colours -
Display Features - Mini-drop display
Display Protection (Screen Protector) Corning Gorilla Glass 4 (scratch resistant glass) -
PROCESSOR OnePlus 3 Realme C21
Processor Type (CPU) Qualcomm Snapdragon 820 MediaTek Helio G35
Processor Number MSM8996 -
Clock Speed 2.15 GHz 2.3 GHz Realme C21 has higher clock speed than OnePlus 3.
Processor Core Qty Quad-core 8-core Realme C21 has higher processor core quantity than OnePlus 3.
64-bit Architecture Yes - OnePlus 3 has 64-bit architecture.
Graphics System (GPU) Qualcomm ADRENO 530 PowerVR GE8320
MEMORY OnePlus 3 Realme C21
RAM 6 GB LPDDR4X SDRAM - 3 GB OnePlus 3 has more RAM than Realme C21.
Internal Memory Size (Storage Capacity) 64 GB 32 GB OnePlus 3 has more internal memory than Realme C21.
Supported Flash Memory Cards (Expandable Memory) - microSD
CAMERA OnePlus 3 Realme C21
MAIN CAMERA
Number of Main Cameras 1 3
Sensor Resolution 16 Megapixel 13 Megapixel OnePlus 3 has better camera resolution than Realme C21.
Sensor Name Sony Exmor RS IMX298 sensor -
Lens Aperture F/2.0 F/2.2 OnePlus 3 has better lens aperture than OnePlus 3.
Lens Construction - 5-element
Optical Image Stabiliser (OIS) Optical Image Stabiliser (OIS) - OnePlus 3 has optical stabilisation.
Focus Adjustment Automatic Automatic
Digital Zoom - 4x
Special Effects HDR HDR
HDR Mode Auto HDR mode -
Camera Modes Panorama Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape
Face Recognition (Face ID) Face detection - OnePlus 3 has face detection.
Light Source LED light LED flash
Video Resolutions 3840 x 2160 (4K) at 30 fps, Slo-mo video 1280 x 720 (720p) at 120 fps 1920 x 1080 (1080p) at 30 fps
Camera Features (Functions) Phase Detect Auto-Focus (PDAF), Electronic Image Stabiliser (EIS), geotagging Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost
SECOND CAMERA
Sensor Resolution (2nd Camera) - 2 Megapixel
Lens Aperture (2nd Camera) - F/2.4
Lens Element Qty (2nd Camera) - 3-element
Camera Functions (2nd Camera) - B&W lens
THIRD CAMERA
Sensor Resolution (3rd Camera) - 2 Megapixel
Lens Aperture (3rd Camera) - F/2.4
Lens Element Qty (3rd Camera) - 3-element
Camera Functions (3rd Camera) - Macro camera
Camera Features (3rd Camera) - 4cm macro photography
FRONT CAMERA
Number of Front Cameras 1 1
Sensor Resolution (Front) 8 Megapixel 5 Megapixel OnePlus 3 has better front camera resolution than Realme C21.
Sensor Name (Front) Sony Exmor R IMX179 sensor -
Lens Aperture (Front) F/2.0 F/2.2 OnePlus 3 has better front lens aperture than OnePlus 3.
Lens Element Qty (Front) - 3-element
Focus Adjustment Focus free -
Special Effects (Front) - HDR
Camera Modes (Front) - Time-lapse mode, Beauty mode, portrait mode, AI Beauty, Filter mode, Panoramic mode
Face Recognition (Face ID) - Face recognition Realme C21 has face detection.
Video Resolutions (Front) 1920 x 1080 (1080p) at 30 fps -
BATTERY AND CHARGING OnePlus 3 Realme C21
Battery Capacity (Battery Size) 3000 mAh 5000 mAh Realme C21 has larger battery capacity than OnePlus 3.
Battery Technology Lithium Ion -
CELLULAR OnePlus 3 Realme C21
Technology CDMA2000 1X / GSM / WCDMA (UMTS) / TD-SCDMA WCDMA (UMTS) / GSM
Mobile Broadband Generation 4G 4G Both phones have the same mobile network generation.
Operating System OxygenOS (based on Android 6.0.1) Android 10
User Interface - Realme UI
Navigation GPS, A-GPS, GLONASS, BeiDou GPS, A-GPS, GLONASS, BeiDou
COMMUNICATIONS OnePlus 3 Realme C21
Data Transmission GPRS, EDGE, EV-DO, HSDPA, HSUPA, HSPA+, LTE, FDD-LTE FDD-LTE, TDD-LTE
2G Band - 850 GSM, 900 GSM, 1800 GSM, 1900 GSM
3G UMTS Band - Band 1, Band 5, Band 8
3G UMTS Frequency - 2100, 850, 900
4G LTE Band Band 1, Band 2, Band 4, Band 5, Band 7, Band 12, Band 17, Band 30 Band 1, Band 3, Band 5, Band 7, Band 8, Band 20, Band 28, Band 38, Band 40, Band 41
4G LTE Frequency FDD 2100, FDD 1900 PCS, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 700a, FDD 700b, FDD 2300 WCS FDD 2100, FDD 1800+, FDD 850, FDD 2600, FDD 900, FDD 800 DD, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500
Wireless Interface IEEE 802.11a/b/g/n/ac IEEE 802.11b/g/n
Bluetooth Bluetooth 4.2 Bluetooth 5.0
Bluetooth Profiles A2DP -
NFC Yes - OnePlus 3 has NFC reader for mobile payments.
Messaging Services SMS, MMS -
MEDIA OnePlus 3 Realme C21
Supported Digital Audio Standards WAV, WMA, MP3, FLAC, eAAC+ -
Supported Digital Video Standards XviD, MPEG-4, DivX, H.265 -
Sound Enhancements Dirac sound technologies -
FEATURES OnePlus 3 Realme C21
Phone Functions Speakerphone, call timer, conference call, flight mode, vibrating alert Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert
Sensors Accelerometer, proximity sensor, digital compass, gyro sensor Accelerometer, proximity sensor, magnetometer, light sensor
Security Devices Fingerprint reader Fingerprint reader
Additional Phone Features DLNA Certified, sharing media via DLNA Super power saving mode, HyperEngine technology, Reverse charging
OTHERS OnePlus 3 Realme C21
Included Accessories Screen protection film, USB cable, power adapter, SIM card removal tool USB cable, power adapter, SIM card removal tool
Compliant Standards - TUV Rheinland
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