Realme C21 vs. OPPO Find X3 PRO

Phone Comparison, Reviews and Tests

In depth comparison and review of Realme C21 and OPPO Find X3 PRO. 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

Realme C21 vs. OPPO Find X3 PRO Comparison Chart
DESIGN AND DIMENSIONS Realme C21 OPPO Find X3 PRO
Product Type Smartphone Smartphone
Manufacturer Model Number - CPH2173
Form Factor Touch Touch
Height 165.2 mm 163.6 mm Realme C21 has greater height than OPPO Find X3 PRO.
Width 76.4 mm 74 mm Realme C21 has greater width than OPPO Find X3 PRO.
Depth 8.9 mm 8.26 mm OPPO Find X3 PRO is narrower than Realme C21.
Weight 190 g 193 g Realme C21 is lighter than Realme C21.
Body Colour Cross black | Cross blue Gloss black
Body Material - Aluminium alloy, polymer, Corning Gorilla Glass 5
Protection - Dustproof, water-resistant
Waterproof (Water-resistant) - Yes OPPO Find X3 PRO is waterproof.
IP rating - IP68
SAR Value - 1.318 W/kg (body), 0.892 W/kg (head), 2.707 W/kg (limb)
Connector Type Micro-USB
Headset jack - mini-phone 3.5mm
USB Type-C - 24 pin USB-C
SIM Card Type (Size) Nano SIM Nano SIM, Electronic SIM card (e-SIM)
SIM Card Qty Dual-SIM Dual-SIM
DISPLAY Realme C21 OPPO Find X3 PRO
Display Type LCD display OLED display
Display Technology LCD AMOLED (LTPO)
Screen Size (Display Size) 6.5" 6.7" OPPO Find X3 PRO has larger screen size than Realme C21.
Screen Resolution (Display Resolution) 1600 x 720 pixels 3216 x 1440 pixels OPPO Find X3 PRO has better screen resolution than Realme C21.
Display Format HD+ QHD+
Pixel Density - 525 ppi
Aspect Ratio 20:9 20.1:9
Max Brightness 420 cd/m² 1200 cd/m² OPPO Find X3 PRO has better display brightness than Realme C21.
Colour Depth - 1.07 billion colours
Contrast Ratio - 5000000:1
HDR - Yes OPPO Find X3 PRO has HDR.
HDR Technology - HDR10+
Display Enhancement Technology - SDR-to-HDR colour enhancement, resolution enhancer
Display Refresh Rate - 120 Hz
Display Features Mini-drop display Night mode, AOD(Always On Display), Dark mode, O1 Ultra Vision Engine, DisplayMate A+, 240Hz sampling rate, 12000000:1 (max HDR) contrast ratio, O-Sync Display Hyper Response Engine, 8192-Level Natural Brightness
Display Protection (Screen Protector) - Corning Gorilla Glass 5 (scratch resistant glass)
PROCESSOR Realme C21 OPPO Find X3 PRO
Processor Type (CPU) MediaTek Helio G35 Qualcomm Snapdragon 888
Clock Speed 2.3 GHz 2.84 GHz OPPO Find X3 PRO has higher clock speed than Realme C21.
Processor Core Qty 8-core 8-core Both phones have the same number of phone cores.
Graphics System (GPU) PowerVR GE8320 Qualcomm ADRENO 660
MEMORY Realme C21 OPPO Find X3 PRO
RAM LPDDR4X SDRAM - 3 GB LPDDR5 SDRAM - 12 GB OPPO Find X3 PRO has more RAM than Realme C21.
Internal Memory Size (Storage Capacity) 32 GB 256 GB OPPO Find X3 PRO has more internal memory than Realme C21.
Memory Interface - UFS 3.1
Supported Flash Memory Cards (Expandable Memory) microSD -
CAMERA Realme C21 OPPO Find X3 PRO
MAIN CAMERA
Number of Main Cameras 3 4
Sensor Resolution 13 Megapixel 50 Megapixel OPPO Find X3 PRO has better camera resolution than Realme C21.
Sensor Size - 1/1.56"
Sensor Name - Sony Exmor RS IMX766 sensor
Lens Aperture F/2.2 F/1.8 OPPO Find X3 PRO has better lens aperture than Realme C21.
Lens Construction 5-element 6-element
Pixel Size - 1 μm
Optical Image Stabiliser (OIS) - Optical Image Stabiliser (OIS) OPPO Find X3 PRO has optical stabilisation.
Focus Adjustment Automatic Automatic
Minimum Focal Length (Focal Distance) - 24 mm
Digital Zoom 4x -
Special Effects HDR HDR, Live HDR, Bokeh effect, Stickers
Camera Modes Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape Burst mode, Panorama, Time-lapse mode, Slow motion mode, night mode, Expert Mode, portrait mode, AI Beauty, Text, Cinema mode, Filter mode, Macro mode, Dual-View Video, Ultra Night Video, AI Highlight Video, passport photo, RAW+ mode, Colour Vision Enhancement
Light Source LED flash LED flash
Still Image Resolutions - 4096 x 3072, 4096 x 2304, 3072 x 3072, 8192 x 6144, 4096 x 1834
Video Resolutions 1920 x 1080 (1080p) at 30 fps 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, 3840 x 2160 (4K) at 30 fps, 1280 x 720 (720p) at 60 fps, 3840 x 2160 (4K) at 60 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps, Slo-mo video 1280 x 720 (720p) at 480 fps
Camera Features (Functions) Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost Electronic Image Stabiliser (EIS), 3D audio recording, omnidirectional autofocus, 2x2 On-Chip Lens (OCL), (DOL-HDR) Digital Overlap High Dynamic Range, 10-bit 4K HDR video, LOG video (Rec. 2020)
SECOND CAMERA
Sensor Resolution (2nd Camera) 2 Megapixel 50 Megapixel OPPO Find X3 PRO has better second camera resolution than Realme C21.
Sensor Size (2nd Camera) - 1/1.56"
Sensor Name (2nd Camera) - Sony Exmor RS IMX766 sensor
Lens Type (2nd Camera) - Ultra wide-angle lens
Lens Aperture (2nd Camera) F/2.4 F/2.2 OPPO Find X3 PRO has better second camera lens aperture than Realme C21.
Lens Element Qty (2nd Camera) 3-element 7-element
Field of View (2nd Camera) - 110 degree(s)
Pixel Size (2nd Camera) - 1 μm
Minimum Focal Length (2nd Camera) - 15 mm
Camera Functions (2nd Camera) B&W lens -
Camera Features (2nd Camera) - Electronic Image Stabiliser (EIS), omnidirectional autofocus, 2x2 On-Chip Lens (OCL), 4cm macro photography
THIRD CAMERA
Sensor Resolution (3rd Camera) 2 Megapixel 13 Megapixel OPPO Find X3 PRO has higher resolution third camera than Realme C21.
Sensor Size (3rd Camera) - 1/3.4"
Sensor Name (3rd Camera) - Samsung S5K3M5
Lens Type (3rd Camera) - Telephoto lens
Lens Aperture (3rd Camera) F/2.4 F/2.4 Both phones have the same lens aperture of the third camera.
Lens Element Qty (3rd Camera) 3-element 5-element
Pixel Size (3rd Camera) - 1 μm
Minimum Focal Length (3rd Camera) - 52 mm
Optical Zoom - 2x
Digital Zoom - 20x
Hybrid Zoom - 5x
Camera Functions (3rd Camera) Macro camera -
Camera Features (3rd Camera) 4cm macro photography Electronic Image Stabiliser (EIS)
FOURTH CAMERA
Sensor Resolution (4th Camera) - 3 Megapixel
Sensor Size (4th Camera) - 1/5"
Lens Type (4th Camera) - Microlens
Lens Aperture (4th Camera) - F/3.0
Lens Element Qty (4th Camera) - 4-element
Pixel Size (4th Camera) - 1.12 μm
Minimum Focal Length (4th Camera) - 15 mm
Camera Features (4th Camera) - Magnification x60
FRONT CAMERA
Number of Front Cameras 1 1
Sensor Resolution (Front) 5 Megapixel 32 Megapixel OPPO Find X3 PRO has better front camera resolution than Realme C21.
Sensor Size (Front) - 1/2.74"
Sensor Name (Front) - Sony Exmor RS IMX615 sensor
Lens Aperture (Front) F/2.2 F/2.4 Realme C21 has better front lens aperture than Realme C21.
Lens Element Qty (Front) 3-element 5-element
Field of View (Front) - 81 degree(s)
Pixel Size (Front) - 0.8 μm
Min Focal Length (Front) - 25 mm
Special Effects (Front) HDR Stickers
Camera Modes (Front) Time-lapse mode, Beauty mode, portrait mode, AI Beauty, Filter mode, Panoramic mode Panorama, Time-lapse mode, night mode, Portrait
Face Recognition (Face ID) Face recognition - Realme C21 has face detection.
Still Image Resolutions (Front) - 6560 x 4928
Video Resolutions (Front) - 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps
Camera Features (Front) - Electronic Image Stabiliser (EIS)
BATTERY AND CHARGING Realme C21 OPPO Find X3 PRO
Battery Capacity (Battery Size) 5000 mAh 4500 mAh Realme C21 has larger battery capacity than OPPO Find X3 PRO.
Fast Charging Technology - VOOC Flash Charge technology 3.0, SuperVOOC 2.0 Flash Charge OPPO Find X3 PRO has fast charging technology.
Recharge Time (Charging Time) - 35 min
Wireless Charging - Yes OPPO Find X3 PRO can be charged wirelessly.
Wireless Charging Standards - Qi, AirVOOC
Standby Time - 398.7 hours
Talk Time - 1488 minutes
Run Time Details - Standby: up to 398.7 hrs
Playback (video): up to 14.3 hrs
Talk (3G): up to 1488 min
Playback (audio (via speakers)): up to 36.9 hrs
CELLULAR Realme C21 OPPO Find X3 PRO
Technology WCDMA (UMTS) / GSM WCDMA (UMTS) / GSM
Mobile Broadband Generation 4G 5G OPPO Find X3 PRO has more advanced generation mobile network.
Operating System Android 10 ColorOS 11.2 (based on Android 11)
User Interface Realme UI -
Navigation GPS, A-GPS, GLONASS, BeiDou GPS, A-GPS, GLONASS, BeiDou, Galileo, QZSS
COMMUNICATIONS Realme C21 OPPO Find X3 PRO
Data Transmission FDD-LTE, TDD-LTE VoLTE, FDD-LTE, TDD-LTE, VoWiFi, 5G NR FR1
2G Band 850 GSM, 900 GSM, 1800 GSM, 1900 GSM 850 GSM, 900 GSM, 1800 GSM, 1900 GSM
3G UMTS Band Band 1, Band 5, Band 8 Band 1, Band 2, Band 4, Band 5, Band 6, Band 8, Band 19
3G UMTS Frequency 2100, 850, 900 2100, 1900, 1700, 850, 800, 900, 800
4G LTE Band Band 1, Band 3, Band 5, Band 7, Band 8, Band 20, Band 28, Band 38, Band 40, Band 41 Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 13, Band 17, Band 18, Band 19, Band 20, Band 25, Band 26, Band 28, Band 32, Band 38, Band 39, Band 40, Band 41, Band 42, Band 66
4G LTE Frequency FDD 2100, FDD 1800+, FDD 850, FDD 2600, FDD 900, FDD 800 DD, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500 FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700c, FDD 700b, FDD 800 lower, FDD 800 upper, FDD 800 DD, FDD 1900+, FDD 850+, FDD 700 APT, FDD 1500 L, TDD 2600, TDD 1900, TDD 2300, TDD 2500, TDD 3500, FDD 1700 - 2110 AWS-3
5G NR Band - N1, n3, n5, n7, n8, n20, n28, n38, n41, n77, n78, n79, n40
5G NR Frequency - FDD 2100, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, TDD TD 3700, TDD TD 3500, TDD TD 4500, TDD 2300
Wireless Interface IEEE 802.11b/g/n IEEE 802.11a/b/g/n/ac/ax
Bluetooth Bluetooth 5.0 Bluetooth 5.2
NFC - Yes OPPO Find X3 PRO has NFC reader for mobile payments.
MEDIA Realme C21 OPPO Find X3 PRO
Supported Digital Audio Standards - WAV, WMA, AAC, AMR, MP3, FLAC, OGG, APE (Monkey's Audio), LDAC, MID, SBC, LHDC
Supported Digital Video Standards - MKV, FLV, AVI, MOV, WMV, ASF, 3GP, H.265, MP4
Sound Enhancements - Dolby Atmos sound technology, Qualcomm aptX audio, Qualcomm TrueWireless Stereo Plus, Qualcomm aptX HD audio
FEATURES Realme C21 OPPO Find X3 PRO
Phone Functions Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert
Sensors Accelerometer, proximity sensor, magnetometer, light sensor Accelerometer, ambient light sensor, proximity sensor, pedometer, digital compass, magnetometer, gyro sensor, gravity sensor, colour temperature sensor
Security Devices Fingerprint reader Fingerprint reader (under display), face recognition
Additional Phone Features Super power saving mode, HyperEngine technology, Reverse charging MIMO technology, MU-MIMO technology, Google Lens, Haptic vibration motor, dual stereo speakers, steam chamber + graphite cooling, triple noise reduction microphones
OTHERS Realme C21 OPPO Find X3 PRO
Included Accessories USB cable, power adapter, SIM card removal tool Headset, protective cover, SIM card removal tool, USB-C cable, protective film, SuperVOOC 65W power adapter
Compliant Standards TUV Rheinland IP68
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