In depth comparison and review of OnePlus 6 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 | OnePlus 6 | Realme C21 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Touch | Touch | |
| Height | 155.7 mm | 165.2 mm | Realme C21 has greater height than OnePlus 6. |
| Width | 75.4 mm | 76.4 mm | Realme C21 has greater width than OnePlus 6. |
| Depth | 7.75 mm | 8.9 mm | OnePlus 6 is narrower than OnePlus 6. |
| Weight | 177 g | 190 g | OnePlus 6 is lighter than OnePlus 6. |
| Body Colour | Mirror black | Cross black | Cross blue | |
| Body Material | Glass | - | |
| Waterproof (Water-resistant) | - | - | |
| SAR Value | 1.38 W/kg (body), 1.33 W/kg (head) | - | |
| Connector Type | Headset jack - mini-phone 3.5mm 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 | OnePlus 6 | Realme C21 |
|---|
| Display Type | OLED display | LCD display | |
|---|---|---|---|
| Display Technology | Optic AMOLED | LCD | |
| Screen Size (Display Size) | 6.28" | 6.5" | Realme C21 has larger screen size than OnePlus 6. |
| Screen Resolution (Display Resolution) | 2280 x 1080 pixels | 1600 x 720 pixels | OnePlus 6 has better screen resolution than Realme C21. |
| Display Format | - | HD+ | |
| Aspect Ratio | 19:9 | 20:9 | |
| Max Brightness | - | 420 cd/m² | |
| Display Features | 2.5D Glass, Reading mode, night mode | Mini-drop display | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 5 (scratch resistant glass) | - |
| PROCESSOR | OnePlus 6 | Realme C21 |
|---|
| Processor Type (CPU) | Qualcomm Snapdragon 845 | MediaTek Helio G35 | |
|---|---|---|---|
| Clock Speed | 2.8 GHz | 2.3 GHz | OnePlus 6 has higher clock speed than Realme C21. |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| 64-bit Architecture | Yes | - | OnePlus 6 has 64-bit architecture. |
| Graphics System (GPU) | Qualcomm ADRENO 630 | PowerVR GE8320 |
| MEMORY | OnePlus 6 | Realme C21 |
|---|
| RAM | LPDDR4X SDRAM - 6 GB | LPDDR4X SDRAM - 3 GB | OnePlus 6 has more RAM than Realme C21. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 64 GB | 32 GB | OnePlus 6 has more internal memory than Realme C21. |
| Supported Flash Memory Cards (Expandable Memory) | - | microSD |
| CAMERA | OnePlus 6 | Realme C21 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 2 | 3 | |
|---|---|---|---|
| Sensor Resolution | 16 Megapixel | 13 Megapixel | OnePlus 6 has better camera resolution than Realme C21. |
| Sensor Name | Sony Exmor RS IMX519 sensor | - | |
| Lens Aperture | F/1.7 | F/2.2 | OnePlus 6 has better lens aperture than OnePlus 6. |
| Lens Construction | - | 5-element | |
| Optical Image Stabiliser (OIS) | Optical Image Stabiliser (OIS) | - | OnePlus 6 has optical stabilisation. |
| Focus Adjustment | Automatic | Automatic | |
| Digital Zoom | - | 4x | |
| Special Effects | Portrait, HDR | HDR | |
| Camera Modes | Panorama, Time-lapse mode, Pro mode, portrait mode | Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape | |
| Light Source | Dual 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, Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps, 3840 x 2160 (4K) at 60 fps, Slo-mo video 1920 x 1080 (1080p) at 480 fps | 1920 x 1080 (1080p) at 30 fps | |
| Camera Features (Functions) | Electronic Image Stabiliser (EIS), RAW image capture, Detect Contrast Auto-Focus (DCAF), Dynamic Denoise, Clear Image | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 20 Megapixel | 2 Megapixel | OnePlus 6 has better second camera resolution than Realme C21. |
|---|---|---|---|
| Sensor Name (2nd Camera) | Sony Exmor RS IMX376K sensor | - | |
| Lens Type (2nd Camera) | Wide-angle lens | - | |
| Lens Aperture (2nd Camera) | F/1.7 | F/2.4 | OnePlus 6 has better second camera lens aperture than OnePlus 6. |
| Lens Element Qty (2nd Camera) | - | 3-element | |
| Camera Functions (2nd Camera) | - | B&W lens | |
| Camera Features (2nd Camera) | Phase Detect Auto-Focus (PDAF) | - |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | - | 2 Megapixel | |
|---|---|---|---|
| Lens Aperture (3rd Camera) | - | F/2.4 | |
| 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 | |
|---|---|---|---|
| Sensor Resolution (Front) | 16 Megapixel | 5 Megapixel | OnePlus 6 has better front camera resolution than Realme C21. |
| Sensor Name (Front) | Sony Exmor RS IMX371 sensor | - | |
| Lens Aperture (Front) | F/2.0 | F/2.2 | OnePlus 6 has better front lens aperture than OnePlus 6. |
| Lens Element Qty (Front) | - | 3-element | |
| Focus Adjustment | Focus free | - | |
| Special Effects (Front) | HDR | HDR | |
| Camera Modes (Front) | Time-lapse mode, Face Beauty | Time-lapse mode, Beauty mode, portrait mode, AI Beauty, Filter mode, Panoramic mode | |
| Face Recognition (Face ID) | Smile Capture | Face recognition | Both phones have face detection. |
| Light Source (Front) | Display flash | - | |
| 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 | OnePlus 6 | Realme C21 |
|---|
| Battery Capacity (Battery Size) | 3300 mAh | 5000 mAh | Realme C21 has larger battery capacity than OnePlus 6. |
|---|
| CELLULAR | OnePlus 6 | Realme C21 |
|---|
| Technology | CDMA2000 1X / GSM / WCDMA (UMTS) / TD-SCDMA | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 4G | Both phones have the same mobile network generation. |
| Operating System | OxygenOS (based on Android Oreo) | Android 10 | |
| User Interface | - | Realme UI | |
| Navigation | GPS, GLONASS, BeiDou, Galileo | GPS, A-GPS, GLONASS, BeiDou |
| COMMUNICATIONS | OnePlus 6 | Realme C21 |
|---|
| Data Transmission | GPRS, EDGE, EV-DO, HSDPA, HSUPA, HSPA+, LTE, FDD-LTE, TDD-LTE | FDD-LTE, TDD-LTE | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM, 800 CDMA2000 1X | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 3G UMTS Band | Band 1, Band 2, Band 4, Band 5, Band 8, Band 9, Band 19 | Band 1, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 900, 1700, 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 25, Band 26, Band 28, Band 29, Band 30, Band 32, Band 34, Band 38, Band 39, Band 40, Band 41, Band 66, Band 71 | 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 1900+, FDD 850+, FDD 700 APT, FDD 700d, FDD 2300 WCS, FDD 1500 L, TDD 2000, TDD 2600, TDD 1900, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3, FDD 600 | 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 802.11a/b/g/n/ac | IEEE 802.11b/g/n | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.0 | |
| NFC | Yes | - | OnePlus 6 has NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | - |
| MEDIA | OnePlus 6 | Realme C21 |
|---|
| Supported Digital Audio Standards | WAV, WMA, AAC, MP3, FLAC, AAC +, OGG, APE (Monkey's Audio), M4A, apt-X, IMY, MID, AMR-WB, AMR-NB, apt-X HD | - | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, FLV, AVI, MOV, MPEG-4, WMV, 3GP, TS, WebM, HEVC, H.265 | - | |
| Sound Enhancements | Dirac Power Sound technology, Dirac HD Sound | - |
| FEATURES | OnePlus 6 | 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, digital compass, gyro sensor, hall sensor, RGB sensor | Accelerometer, proximity sensor, magnetometer, light sensor | |
| Security Devices | Face recognition, fingerprint reader | Fingerprint reader | |
| Additional Phone Features | Noise Cancellation Technology, MIMO technology, Android Sensor Hub, RGB LED notification light | Super power saving mode, HyperEngine technology, Reverse charging |
| OTHERS | OnePlus 6 | Realme C21 |
|---|
| Included Accessories | SIM card removal tool, screen protector (pre-applied), translucent case, fast charge USB-C cable, fast charge power adapter | USB cable, power adapter, SIM card removal tool | |
|---|---|---|---|
| Compliant Standards | - | TUV Rheinland |
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