In depth comparison and review of OPPO Reno4 Z 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 Reno4 Z 5G | Realme C21 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | CPH2065 | - | |
| Form Factor | Touch | Touch | |
| Height | 163.8 mm | 165.2 mm | Realme C21 has greater height than OPPO Reno4 Z 5G. |
| Width | 75.5 mm | 76.4 mm | Realme C21 has greater width than OPPO Reno4 Z 5G. |
| Depth | 8.1 mm | 8.9 mm | OPPO Reno4 Z 5G is narrower than OPPO Reno4 Z 5G. |
| Weight | 184 g | 190 g | OPPO Reno4 Z 5G is lighter than OPPO Reno4 Z 5G. |
| Body Colour | Ink black | Dew white | Cross black | Cross blue | |
| Waterproof (Water-resistant) | - | - | |
| SAR Value | 0.905 W/kg (head), 0.88 W/kg (head), 2.686 W/kg (limb) | - | |
| Connector Type | USB Type-C - 24 pin USB-C Headset jack - mini-phone 3.5mm |
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 Reno4 Z 5G | Realme C21 |
|---|
| Display Type | LCD display | LCD display | |
|---|---|---|---|
| Display Technology | LTPS | LCD | |
| Screen Size (Display Size) | 6.57" | 6.5" | OPPO Reno4 Z 5G has larger screen size than Realme C21. |
| Screen Resolution (Display Resolution) | 2400 x 1080 pixels | 1600 x 720 pixels | OPPO Reno4 Z 5G has better screen resolution than Realme C21. |
| Display Format | Full HD+ | HD+ | |
| Pixel Density | 401 ppi | - | |
| Aspect Ratio | - | 20:9 | |
| Max Brightness | 480 cd/m² | 420 cd/m² | OPPO Reno4 Z 5G has better display brightness than Realme C21. |
| Colour Depth | 16.7 million colours | - | |
| Contrast Ratio | 1500:1 | - | |
| Display Refresh Rate | 120 Hz | - | |
| Touch Sampling Rate | 120 Hz | - | |
| Display Features | Dark mode | Mini-drop display | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 3 (scratch resistant glass) | - |
| PROCESSOR | OPPO Reno4 Z 5G | Realme C21 |
|---|
| Processor Type (CPU) | MediaTek Dimensity 800 5G | MediaTek Helio G35 | |
|---|---|---|---|
| Processor Number | MT6873V | - | |
| Clock Speed | 2 GHz | 2.3 GHz | Realme C21 has higher clock speed than OPPO Reno4 Z 5G. |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| Graphics System (GPU) | Mali-G57 MC4 | PowerVR GE8320 |
| MEMORY | OPPO Reno4 Z 5G | Realme C21 |
|---|
| RAM | LPDDR4X SDRAM - 8 GB | LPDDR4X SDRAM - 3 GB | OPPO Reno4 Z 5G has more RAM than Realme C21. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 128 GB | 32 GB | OPPO Reno4 Z 5G has more internal memory than Realme C21. |
| Memory Interface | UFS 2.1 | - | |
| Supported Flash Memory Cards (Expandable Memory) | - | microSD |
| CAMERA | OPPO Reno4 Z 5G | Realme C21 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 3 | |
|---|---|---|---|
| Sensor Resolution | 48 Megapixel | 13 Megapixel | OPPO Reno4 Z 5G has better camera resolution than Realme C21. |
| Sensor Size | 1/2" | - | |
| Lens Aperture | F/1.7 | F/2.2 | OPPO Reno4 Z 5G has better lens aperture than OPPO Reno4 Z 5G. |
| Lens Construction | 6-element | 5-element | |
| Pixel Size | 0.8 μm | - | |
| Focus Adjustment | Automatic | Automatic | |
| Minimum Focal Length (Focal Distance) | 25 mm | - | |
| Digital Zoom | - | 4x | |
| Special Effects | Live HDR, Bokeh effect, Stickers | HDR | |
| Camera Modes | Panorama, Time-lapse mode, Slow motion mode, Expert Mode, Portrait, Night, Dazzle Colour Mode, Ultra dark 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 | |
| Still Image Resolutions | 8000 x 6000 | - | |
| Video Resolutions | 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps, 3840 x 2160 (4K) at 30 fps | 1920 x 1080 (1080p) at 30 fps | |
| Camera Features (Functions) | Phase Detect Auto-Focus (PDAF), EIS video stabilisation, Ultra Steady Video, contrast detection auto-focus (CDAF), 4-in-1 pixel binning | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 8 Megapixel | 2 Megapixel | OPPO Reno4 Z 5G has better second camera resolution than Realme C21. |
|---|---|---|---|
| Lens Type (2nd Camera) | Ultra wide-angle lens | - | |
| Lens Aperture (2nd Camera) | F/2.2 | F/2.4 | OPPO Reno4 Z 5G has better second camera lens aperture than OPPO Reno4 Z 5G. |
| Lens Element Qty (2nd Camera) | 5-element | 3-element | |
| Field of View (2nd Camera) | 119 degree(s) | - | |
| Pixel Size (2nd Camera) | 1.12 μm | - | |
| Minimum Focal Length (2nd Camera) | 16 mm | - | |
| Camera Functions (2nd Camera) | - | B&W lens | |
| Camera Features (2nd Camera) | 5-piece 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 | |
| Pixel Size (3rd Camera) | 1.75 μm | - | |
| Camera Functions (3rd Camera) | - | Macro camera | |
| Camera Features (3rd Camera) | - | 4cm macro photography |
| FOURTH CAMERA |
|---|
| Sensor Resolution (4th Camera) | 2 Megapixel | - | |
|---|---|---|---|
| Lens Aperture (4th Camera) | F/2.4 | - | |
| Lens Element Qty (4th Camera) | 3-element | - | |
| Pixel Size (4th Camera) | 1.75 μm | - | |
| Camera Functions (4th Camera) | Monochrome | - |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 2 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 16 Megapixel | 5 Megapixel | OPPO Reno4 Z 5G has better front camera resolution than Realme C21. |
| Lens Aperture (Front) | F/2.0 | F/2.2 | OPPO Reno4 Z 5G has better front lens aperture than OPPO Reno4 Z 5G. |
| Lens Element Qty (Front) | - | 3-element | |
| Pixel Size (Front) | 1 μm | - | |
| Special Effects (Front) | HDR | HDR | |
| Camera Modes (Front) | Panorama, Time-lapse mode, Slow motion mode, night mode, Expert Mode, Portrait | Time-lapse mode, Beauty mode, portrait mode, AI Beauty, Filter mode, Panoramic mode | |
| Face Recognition (Face ID) | - | Face recognition | Realme C21 has face detection. |
| Light Source (Front) | Display flash | - | |
| Still Image Resolutions (Front) | 4608 x 3456 | - | |
| Video Resolutions (Front) | 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps | - | |
| Camera Features (Front) | 5P lens | - |
| SECOND FRONT CAMERA |
|---|
| Sensor Resolution (2nd Front) | 2 Megapixel | - | |
|---|---|---|---|
| Lens Aperture (2nd Front) | F/2.4 | - | |
| Pixel Size (2nd Front) | 1.75 μm | - | |
| Camera Functions (2nd Front) | 3D depth camera | - | |
| Camera Features (2nd Front) | 3-piece lens | - |
| BATTERY AND CHARGING | OPPO Reno4 Z 5G | Realme C21 |
|---|
| Battery Capacity (Battery Size) | 4000 mAh | 5000 mAh | Realme C21 has larger battery capacity than OPPO Reno4 Z 5G. |
|---|---|---|---|
| Recharge Time (Charging Time) | 116 min | - | |
| Battery Technology | Lithium Ion | - |
| CELLULAR | OPPO Reno4 Z 5G | Realme C21 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 5G | 4G | OPPO Reno4 Z 5G has more advanced generation mobile network. |
| Operating System | ColorOS 7.1 (based on Android 10) | Android 10 | |
| User Interface | - | Realme UI | |
| Navigation | GPS, A-GPS, GLONASS, BeiDou, Galileo, QZSS | GPS, A-GPS, GLONASS, BeiDou |
| COMMUNICATIONS | OPPO Reno4 Z 5G | Realme C21 |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, VoLTE, 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 17, Band 18, Band 19, Band 20, Band 26, Band 28, 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 700b, FDD 800 lower, FDD 800 upper, FDD 800 DD, FDD 850+, FDD 700 APT, 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 | |
| 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 802.11a/b/g/n/ac | IEEE 802.11b/g/n | |
| Bluetooth | Bluetooth 5.1 | Bluetooth 5.0 | |
| NFC | Yes | - | OPPO Reno4 Z 5G has NFC reader for mobile payments. |
| MEDIA | OPPO Reno4 Z 5G | Realme C21 |
|---|
| Supported Digital Audio Standards | WAV, WMA, AAC, AMR, MP3, FLAC, OGG, APE (Monkey's Audio), apt-X, LDAC, MID, SBC, apt-X HD | - | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, FLV, AVI, WMV, ASF, 3GP, H.264, H.265, MP4 | - | |
| Sound Enhancements | Hi-Res audio certified, Dirac 2.0 sound effect | - |
| FEATURES | OPPO Reno4 Z 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, geomagnetic sensor, gravity sensor | Accelerometer, proximity sensor, magnetometer, light sensor | |
| Security Devices | Face recognition, fingerprint reader (side) | Fingerprint reader | |
| Additional Phone Features | Multitasking, Fast Charging, OPPO Relax | Super power saving mode, HyperEngine technology, Reverse charging |
| OTHERS | OPPO Reno4 Z 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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