In depth comparison and review of Realme C21 and OPPO Reno8 5G. 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 Reno8 5G |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Touch | Touch | |
| Height | 165.2 mm | 160 mm | Realme C21 has greater height than OPPO Reno8 5G. |
| Width | 76.4 mm | 73.4 mm | Realme C21 has greater width than OPPO Reno8 5G. |
| Depth | 8.9 mm | 7.67 mm | OPPO Reno8 5G is narrower than Realme C21. |
| Weight | 190 g | 179 g | OPPO Reno8 5G is lighter than Realme C21. |
| Body Colour | Cross black | Cross blue | Shimmer black | Gold shimmer | |
| Waterproof (Water-resistant) | - | - | OPPO Reno8 5G is waterproof. |
| SAR Value | - | 0.96 W/kg (head), 1.288 W/kg (body), 2.756 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 | |
| SIM Card Qty | Dual-SIM | Dual-SIM |
| DISPLAY | Realme C21 | OPPO Reno8 5G |
|---|
| Display Type | LCD display | OLED display | |
|---|---|---|---|
| Display Technology | LCD | Rigid AMOLED | |
| Screen Size (Display Size) | 6.5" | 6.4" | Realme C21 has larger screen size than OPPO Reno8 5G. |
| Screen Resolution (Display Resolution) | 1600 x 720 pixels | 2400 x 1080 pixels | OPPO Reno8 5G has better screen resolution than Realme C21. |
| Display Format | HD+ | Full HD | |
| Pixel Density | - | 409 ppi | |
| Aspect Ratio | 20:9 | - | |
| Max Brightness | 420 cd/m² | 800 cd/m² | OPPO Reno8 5G has better display brightness than Realme C21. |
| Colour Depth | - | 16.7 million colours | |
| HDR | - | Yes | OPPO Reno8 5G has HDR. |
| Display Refresh Rate | - | 90 Hz | |
| Touch Sampling Rate | - | 180 Hz | |
| Display Features | Mini-drop display | O1 Ultra Vision Engine, Eye Care, 97% NTSC, 95% DCI-P3 | |
| Display Protection (Screen Protector) | - | Corning Gorilla Glass 5 (scratch resistant glass) |
| PROCESSOR | Realme C21 | OPPO Reno8 5G |
|---|
| Processor Type (CPU) | MediaTek Helio G35 | MediaTek Dimensity 1300 | |
|---|---|---|---|
| Clock Speed | 2.3 GHz | 3 GHz | OPPO Reno8 5G 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 | ARM Mali-G77 MC9 |
| MEMORY | Realme C21 | OPPO Reno8 5G |
|---|
| RAM | LPDDR4X SDRAM - 3 GB | LPDDR4X SDRAM - 8 GB | OPPO Reno8 5G has more RAM than Realme C21. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 32 GB | 256 GB | OPPO Reno8 5G has more internal memory than Realme C21. |
| Memory Interface | - | UFS 3.1 | |
| Supported Flash Memory Cards (Expandable Memory) | microSD | - |
| CAMERA | Realme C21 | OPPO Reno8 5G |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 3 | 3 | |
|---|---|---|---|
| Sensor Resolution | 13 Megapixel | 50 Megapixel | OPPO Reno8 5G 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 Reno8 5G has better lens aperture than Realme C21. |
| Lens Construction | 5-element | 7-element | |
| Field of View (FoV) | - | 86 degree(s) | |
| Focus Adjustment | Automatic | Automatic | |
| Digital Zoom | 4x | - | |
| Special Effects | HDR | Stickers, DOL-HDR | |
| 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, Pro mode, HYPERLAPSE, Portrait, Night, Macro slow-motion video, Dual-View Video, Extra HD, Text scanner | |
| Light Source | LED flash | - | |
| 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, Slo-mo video 1920 x 1080 (1080p) at 120 fps, Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps, 1280 x 720 (720p) at 60 fps | |
| Camera Features (Functions) | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost | AI Portrait, All Pixel OmniDirectional PDAF |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 2 Megapixel | - | |
|---|---|---|---|
| Lens Type (2nd Camera) | - | Ultra wide-angle lens | |
| Lens Aperture (2nd Camera) | F/2.4 | F/2.2 | OPPO Reno8 5G has better second camera lens aperture than Realme C21. |
| Lens Element Qty (2nd Camera) | 3-element | 5-element | |
| Field of View (2nd Camera) | - | 112 degree(s) | |
| Camera Functions (2nd Camera) | B&W lens | - |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 2 Megapixel | - | |
|---|---|---|---|
| Lens Aperture (3rd Camera) | F/2.4 | - | |
| Lens Element Qty (3rd Camera) | 3-element | 3-element | |
| Field of View (3rd Camera) | - | 89 degree(s) | |
| Camera Functions (3rd Camera) | Macro camera | Macro camera | |
| Camera Features (3rd Camera) | 4cm macro photography | - |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 5 Megapixel | 32 Megapixel | OPPO Reno8 5G has better front camera resolution than Realme C21. |
| Sensor Size (Front) | - | 1/2.74" | |
| 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 | RGB, Stickers, DOL-HDR | |
| Camera Modes (Front) | Time-lapse mode, Beauty mode, portrait mode, AI Beauty, Filter mode, Panoramic mode | Panorama, Time-lapse mode, night mode, Portrait, Dual-View Video | |
| 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) | - | AI portrait retouching |
| BATTERY AND CHARGING | Realme C21 | OPPO Reno8 5G |
|---|
| Battery Capacity (Battery Size) | 5000 mAh | 4500 mAh | Realme C21 has larger battery capacity than OPPO Reno8 5G. |
|---|---|---|---|
| Fast Charging Technology | - | Qualcomm Quick Charge, VOOC Flash Charge technology, SuperVOOC Flash Charge technology, Power Delivery | OPPO Reno8 5G has fast charging technology. |
| CELLULAR | Realme C21 | OPPO Reno8 5G |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 5G | OPPO Reno8 5G has more advanced generation mobile network. |
| 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 Reno8 5G |
|---|
| Data Transmission | FDD-LTE, TDD-LTE | FDD-LTE, TDD-LTE, 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 17, Band 18, Band 19, Band 20, Band 26, Band 28, Band 38, Band 39, 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 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 | |
| 5G NR Band | - | N1, n3, n5, n7, n8, n20, n28, n38, n41, n77, n78, 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 2300 | |
| Wireless Interface | IEEE 802.11b/g/n | IEEE 802.11a/b/g/n/ac/ax | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.3 BLE | |
| NFC | - | Yes | OPPO Reno8 5G has NFC reader for mobile payments. |
| MEDIA | Realme C21 | OPPO Reno8 5G |
|---|
| Supported Digital Audio Standards | - | AAC, LDAC, SBC, apt-X HD |
|---|
| FEATURES | Realme C21 | OPPO Reno8 5G |
|---|
| 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, geomagnetic sensor, gravity sensor, optical sensor, light sensor, gyroscope | |
| Security Devices | Fingerprint reader | Fingerprint reader (under display), face recognition | |
| Additional Phone Features | Super power saving mode, HyperEngine technology, Reverse charging | MIMO technology, Air Gesture, MU-MIMO technology, Step counter, AI System Booster, Battery Health Engine, Super-Conductive VC Liquid Cooling System |
| OTHERS | Realme C21 | OPPO Reno8 5G |
|---|
| Included Accessories | USB cable, power adapter, SIM card removal tool | Power adapter, SIM card removal tool, USB-C cable | |
|---|---|---|---|
| Compliant Standards | TUV Rheinland | TUV SUD, SGS Eye Care Display Certification, Netflix HD Certification, Amazon Prime Video HD Certification |
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