In depth comparison and review of OPPO Reno 5G 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.
| DESIGN AND DIMENSIONS | OPPO Reno 5G | Realme C21 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Touch | Touch | |
| Height | 162 mm | 165.2 mm | Realme C21 has greater height than OPPO Reno 5G. |
| Width | 77.2 mm | 76.4 mm | OPPO Reno 5G has greater width than Realme C21. |
| Depth | 9.3 mm | 8.9 mm | Realme C21 is narrower than OPPO Reno 5G. |
| Weight | 215 g | 190 g | Realme C21 is lighter than OPPO Reno 5G. |
| Body Colour | Ocean green | Cross black | Cross blue | |
| Waterproof (Water-resistant) | - | - | |
| Connector Type | 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 | OPPO Reno 5G | Realme C21 |
|---|
| Display Type | OLED display | LCD display | |
|---|---|---|---|
| Display Technology | AMOLED | LCD | |
| Screen Size (Display Size) | 6.6" | 6.5" | OPPO Reno 5G has larger screen size than Realme C21. |
| Screen Resolution (Display Resolution) | 2340 x 1080 pixels | 1600 x 720 pixels | OPPO Reno 5G has better screen resolution than Realme C21. |
| Display Format | Full HD+ | HD+ | |
| Pixel Density | 387 ppi | - | |
| Aspect Ratio | - | 20:9 | |
| Max Brightness | - | 420 cd/m² | |
| Colour Depth | 16.7 million colours | - | |
| Display Features | DCI-P3 Wide colour gamut | Mini-drop display | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 6 (scratch resistant glass) | - |
| PROCESSOR | OPPO Reno 5G | Realme C21 |
|---|
| Processor Type (CPU) | Qualcomm Snapdragon 855 | MediaTek Helio G35 | |
|---|---|---|---|
| Clock Speed | - | 2.3 GHz | |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| 64-bit Architecture | Yes | - | OPPO Reno 5G has 64-bit architecture. |
| Graphics System (GPU) | Qualcomm ADRENO 640 | PowerVR GE8320 |
| MEMORY | OPPO Reno 5G | Realme C21 |
|---|
| RAM | 8 GB | LPDDR4X SDRAM - 3 GB | OPPO Reno 5G has more RAM than Realme C21. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 256 GB | 32 GB | OPPO Reno 5G has more internal memory than Realme C21. |
| Supported Flash Memory Cards (Expandable Memory) | microSDHC, microSDXC - up to 256 GB | microSD |
| CAMERA | OPPO Reno 5G | Realme C21 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 3 | 3 | |
|---|---|---|---|
| Sensor Resolution | 48 Megapixel | 13 Megapixel | OPPO Reno 5G has better camera resolution than Realme C21. |
| Sensor Size | 1/2" | - | |
| Sensor Name | Sony Exmor RS IMX586 sensor | - | |
| Lens Aperture | F/1.7 | F/2.2 | OPPO Reno 5G has better lens aperture than OPPO Reno 5G. |
| Lens Construction | 6-element | 5-element | |
| Pixel Size | 0.8 μm | - | |
| Optical Image Stabiliser (OIS) | Dual OIS (Optical Image Stabilisation) | - | OPPO Reno 5G has optical stabilisation. |
| Focus Adjustment | Automatic | Automatic | |
| Digital Zoom | - | 4x | |
| Special Effects | HDR | HDR | |
| Camera Modes | Time-lapse mode, night mode, Expert Mode, AI Portait, Pano mode, Dazzle Colour Mode | Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape | |
| Light Source | LED flash | LED flash | |
| Video Resolutions | 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 | 1920 x 1080 (1080p) at 30 fps | |
| Camera Features (Functions) | Noise reduction, Phase Detect Auto-Focus (PDAF), 10x Hybrid Zoom | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 8 Megapixel | 2 Megapixel | OPPO Reno 5G has better second camera resolution than Realme C21. |
|---|---|---|---|
| Lens Aperture (2nd Camera) | F/2.2 | F/2.4 | OPPO Reno 5G has better second camera lens aperture than OPPO Reno 5G. |
| Lens Element Qty (2nd Camera) | - | 3-element | |
| Camera Functions (2nd Camera) | - | B&W lens |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 13 Megapixel | 2 Megapixel | OPPO Reno 5G has higher resolution third camera than Realme C21. |
|---|---|---|---|
| Lens Aperture (3rd Camera) | F/3.0 | F/2.4 | Realme C21 has better third camera lens aperture than OPPO Reno 5G. |
| 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 | |
|---|---|---|---|
| Front Camera Design | Pop-up | - | |
| Sensor Resolution (Front) | 16 Megapixel | 5 Megapixel | OPPO Reno 5G has better front camera resolution than Realme C21. |
| Lens Aperture (Front) | F/2.0 | F/2.2 | OPPO Reno 5G has better front lens aperture than OPPO Reno 5G. |
| Lens Element Qty (Front) | 5-element | 3-element | |
| Special Effects (Front) | - | HDR | |
| Camera Modes (Front) | AI Beauty | 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, 1280 x 720 (720p) at 30 fps | - |
| BATTERY AND CHARGING | OPPO Reno 5G | Realme C21 |
|---|
| Battery Capacity (Battery Size) | 4065 mAh | 5000 mAh | Realme C21 has larger battery capacity than OPPO Reno 5G. |
|---|---|---|---|
| Fast Charging Technology | VOOC Flash Charge technology | - | OPPO Reno 5G has fast charging technology. |
| Battery Technology | Lithium Ion | - |
| CELLULAR | OPPO Reno 5G | Realme C21 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 5G | 4G | OPPO Reno 5G has more advanced generation mobile network. |
| Operating System | ColorOS 6 (based on Android 9) | Android 10 | |
| User Interface | - | Realme UI | |
| Navigation | GPS | GPS, A-GPS, GLONASS, BeiDou |
| COMMUNICATIONS | OPPO Reno 5G | Realme C21 |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, FDD-LTE, TDD-LTE, 5G NR FR1 | FDD-LTE, TDD-LTE | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 3G UMTS Band | Band 1, Band 2, Band 4, Band 5, Band 6, Band 8, Band 19 | Band 1, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 800, 900, 800 | 2100, 850, 900 | |
| 4G LTE Band | 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 29, Band 32, Band 34, Band 38, Band 39, Band 40, Band 41, Band 66 | 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 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 700d, FDD 1500 L, TDD 2000, TDD 2600, TDD 1900, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 | FDD 2100, FDD 1800+, FDD 850, FDD 2600, FDD 900, FDD 800 DD, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500 | |
| Wireless Interface | Wi-Fi | IEEE 802.11b/g/n | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.0 | |
| NFC | Yes | - | OPPO Reno 5G has NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | - |
| MEDIA | OPPO Reno 5G | Realme C21 |
|---|
| Sound Enhancements | Dolby Atmos sound technology | - |
|---|
| FEATURES | OPPO Reno 5G | Realme C21 |
|---|
| 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, ambient light sensor, proximity sensor, gyro sensor, geomagnetic sensor | Accelerometer, proximity sensor, magnetometer, light sensor | |
| Security Devices | Fingerprint reader (under display) | Fingerprint reader | |
| Additional Phone Features | Protective O-Dot, Game Boost 2.0 | Super power saving mode, HyperEngine technology, Reverse charging |
| OTHERS | OPPO Reno 5G | Realme C21 |
|---|
| Included Accessories | Headphones, power adapter, SIM card removal tool, USB-C cable, protective case | USB cable, power adapter, SIM card removal tool | |
|---|---|---|---|
| Compliant Standards | TUV Rheinland Low Blue Light Certification | TUV Rheinland |
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