In depth comparison and review of Realme C21 and OPPO Reno7. 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 Reno7 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | - | CPH2363 | |
| Form Factor | Touch | Touch | |
| Height | 165.2 mm | 159.9 mm | Realme C21 has greater height than OPPO Reno7. |
| Width | 76.4 mm | 73.2 mm | Realme C21 has greater width than OPPO Reno7. |
| Depth | 8.9 mm | 7.54 mm | OPPO Reno7 is narrower than Realme C21. |
| Weight | 190 g | 175 g | OPPO Reno7 is lighter than Realme C21. |
| Body Colour | Cross black | Cross blue | Sunset orange | Cosmic black | |
| Body Material | - | Fibreglass leather | |
| Protection | - | Splashproof | |
| Waterproof (Water-resistant) | - | - | OPPO Reno7 is waterproof. |
| IP rating | - | IPX4 | |
| SAR Value | - | 1.03 W/kg (body), 0.8 W/kg (head), 2.36 W/kg (limb) | |
| Connector Type | Micro-USB Headset jack - mini-phone 3.5mm |
USB Type-C - 24 pin USB-C Headset jack - mini-phone 3.5mm |
|
| SIM Card Type (Size) | Nano SIM | Nano SIM, nanoUIM | |
| SIM Card Qty | Dual-SIM | Dual-SIM |
| DISPLAY | Realme C21 | OPPO Reno7 |
|---|
| Display Type | LCD display | OLED display | |
|---|---|---|---|
| Display Technology | LCD | AMOLED | |
| Screen Size (Display Size) | 6.5" | 6.43" | Realme C21 has larger screen size than OPPO Reno7. |
| Screen Resolution (Display Resolution) | 1600 x 720 pixels | 2400 x 1080 pixels | OPPO Reno7 has better screen resolution than Realme C21. |
| Display Format | HD+ | - | |
| Pixel Density | - | 409 ppi | |
| Aspect Ratio | 20:9 | - | |
| Max Brightness | 420 cd/m² | 600 cd/m² | OPPO Reno7 has better display brightness than Realme C21. |
| Colour Depth | - | 16.7 million colours | |
| HDR | - | Yes | OPPO Reno7 has HDR. |
| Display Refresh Rate | - | 90 Hz | |
| Touch Sampling Rate | - | 180 Hz | |
| Display Features | Mini-drop display | Eye Care, sRGB support, 97% NTSC, High brightness mode, Vivid mode, 95% DCI-P3, adaptive sleep | |
| Display Protection (Screen Protector) | - | Corning Gorilla Glass 5 (scratch resistant glass) |
| PROCESSOR | Realme C21 | OPPO Reno7 |
|---|
| Processor Type (CPU) | MediaTek Helio G35 | Qualcomm Snapdragon 680 | |
|---|---|---|---|
| Clock Speed | 2.3 GHz | 2.4 GHz | OPPO Reno7 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 610 |
| MEMORY | Realme C21 | OPPO Reno7 |
|---|
| RAM | LPDDR4X SDRAM - 3 GB | LPDDR4X SDRAM - 8 GB + up to 5 GB virtual extension | OPPO Reno7 has more RAM than Realme C21. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 32 GB | 128 GB | OPPO Reno7 has more internal memory than Realme C21. |
| Memory Interface | - | UFS 2.2 | |
| Supported Flash Memory Cards (Expandable Memory) | microSD | - |
| CAMERA | Realme C21 | OPPO Reno7 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 3 | 3 | |
|---|---|---|---|
| Sensor Resolution | 13 Megapixel | 64 Megapixel | OPPO Reno7 has better camera resolution than Realme C21. |
| Lens Aperture | F/2.2 | F/1.7 | OPPO Reno7 has better lens aperture than Realme C21. |
| Lens Construction | 5-element | 6-element | |
| Field of View (FoV) | - | 79 degree(s) | |
| Focus Adjustment | Automatic | Automatic | |
| Digital Zoom | 4x | - | |
| Special Effects | HDR | Stickers | |
| Camera Modes | Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape | Panorama, Time-lapse mode, Slow motion mode, night mode, Expert Mode, Portrait, Extra HD, 108MP mode, Text scanner, Bokeh Flare Portrait | |
| Light Source | LED flash | Flash | |
| Video Resolutions | 1920 x 1080 (1080p) at 30 fps | 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps, Slo-mo video 1280 x 720 (720p) at 120 fps | |
| Camera Features (Functions) | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost | EIS video stabilisation, Google Lens, multi-frame photo capture, open-loop motor |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 2 Megapixel | 2 Megapixel | Both phones have the same second camera resolution. |
|---|---|---|---|
| Lens Type (2nd Camera) | - | Microlens | |
| Lens Aperture (2nd Camera) | F/2.4 | F/3.3 | Realme C21 has better second camera lens aperture than Realme C21. |
| Lens Element Qty (2nd Camera) | 3-element | 3-element | |
| Field of View (2nd Camera) | - | 65 degree(s) | |
| Camera Functions (2nd Camera) | B&W lens | - | |
| Camera Modes (2nd Camera) | - | Microscope | |
| Camera Features (2nd Camera) | - | IR lens |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 2 Megapixel | 2 Megapixel | Both phones have the same third camera resolution. |
|---|---|---|---|
| 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 | 3-element | |
| Field of View (3rd Camera) | - | 89 degree(s) | |
| Camera Functions (3rd Camera) | Macro camera | Depth camera | |
| Camera Features (3rd Camera) | 4cm macro photography | Monochrome, IR lens |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 5 Megapixel | 32 Megapixel | OPPO Reno7 has better front camera resolution than Realme C21. |
| Sensor Name (Front) | - | Sony IMX709 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) | - | 85 degree(s) | |
| Special Effects (Front) | HDR | 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, Bokeh Flare Portrait | |
| 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 | |
| Camera Features (Front) | - | Video stabilisation |
| BATTERY AND CHARGING | Realme C21 | OPPO Reno7 |
|---|
| Battery Capacity (Battery Size) | 5000 mAh | 4500 mAh | Realme C21 has larger battery capacity than OPPO Reno7. |
|---|---|---|---|
| Fast Charging Technology | - | SuperVOOC Flash Charge technology | OPPO Reno7 has fast charging technology. |
| CELLULAR | Realme C21 | OPPO Reno7 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 4G | Both phones have the same mobile network generation. |
| Operating System | Android 10 | ColorOS 12.1 (based on Android 12) | |
| User Interface | Realme UI | - | |
| Navigation | GPS, A-GPS, GLONASS, BeiDou | GPS, A-GPS, GLONASS, BeiDou, Galileo, QZSS |
| COMMUNICATIONS | Realme C21 | OPPO Reno7 |
|---|
| Data Transmission | FDD-LTE, TDD-LTE | FDD-LTE, TD-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 5, Band 8 | Band 1, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 850, 900 | 2100, 850, 900 | |
| 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 3, Band 5, Band 7, Band 8, Band 20, Band 28, Band 38, Band 40, Band 41 | |
| 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 1800+, FDD 850, FDD 2600, FDD 900, FDD 800 DD, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500 | |
| Wireless Interface | IEEE 802.11b/g/n | IEEE 802.11a/b/g/n/ac | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.1 LE | |
| Bluetooth Profiles | - | SBC | |
| NFC | - | Yes | OPPO Reno7 has NFC reader for mobile payments. |
| MEDIA | Realme C21 | OPPO Reno7 |
|---|
| Supported Digital Audio Standards | - | AAC, apt-X, LDAC, SBC, apt-X HD |
|---|
| FEATURES | Realme C21 | OPPO Reno7 |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | - | |
|---|---|---|---|
| Sensors | Accelerometer, proximity sensor, magnetometer, light sensor | Accelerometer, proximity sensor, pedometer, digital compass, geomagnetic sensor, gravity sensor, optical sensor, gyroscope | |
| Security Devices | Fingerprint reader | Fingerprint reader (under display), face recognition | |
| Security Technology | - | Face Unlock | |
| Additional Phone Features | Super power saving mode, HyperEngine technology, Reverse charging | Air Gesture, Fast Charging, OTG Reverse Charge, Game focus mode |
| OTHERS | Realme C21 | OPPO Reno7 |
|---|
| Included Accessories | USB cable, power adapter, SIM card removal tool | USB cable, power adapter, SIM card removal tool, protective case | |
|---|---|---|---|
| Compliant Standards | TUV Rheinland | IPX4, SGS Eye Care Display Certification |
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