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.
| 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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