In depth comparison and review of OnePlus 3 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 3 | Realme C21 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Touch | Touch | |
| Height | 152.7 mm | 165.2 mm | Realme C21 has greater height than OnePlus 3. |
| Width | 74.7 mm | 76.4 mm | Realme C21 has greater width than OnePlus 3. |
| Depth | 7.4 mm | 8.9 mm | OnePlus 3 is narrower than OnePlus 3. |
| Weight | 158 g | 190 g | OnePlus 3 is lighter than OnePlus 3. |
| Body Colour | - | Cross black | Cross blue | |
| Body Material | Anodised aluminium | - | |
| Waterproof (Water-resistant) | - | - | |
| SAR Value | 0.645 W/kg (body), 0.995 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 3 | Realme C21 |
|---|
| Display Type | OLED display | LCD display | |
|---|---|---|---|
| Display Technology | Optic AMOLED | LCD | |
| Screen Size (Display Size) | 5.5" | 6.5" | Realme C21 has larger screen size than OnePlus 3. |
| Screen Resolution (Display Resolution) | 1920 x 1080 pixels | 1600 x 720 pixels | OnePlus 3 has better screen resolution than Realme C21. |
| Display Format | Full HD | HD+ | |
| Pixel Density | 401 ppi | - | |
| Aspect Ratio | - | 20:9 | |
| Max Brightness | - | 420 cd/m² | |
| Colour Depth | 16.7 million colours | - | |
| Display Features | - | Mini-drop display | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 4 (scratch resistant glass) | - |
| PROCESSOR | OnePlus 3 | Realme C21 |
|---|
| Processor Type (CPU) | Qualcomm Snapdragon 820 | MediaTek Helio G35 | |
|---|---|---|---|
| Processor Number | MSM8996 | - | |
| Clock Speed | 2.15 GHz | 2.3 GHz | Realme C21 has higher clock speed than OnePlus 3. |
| Processor Core Qty | Quad-core | 8-core | Realme C21 has higher processor core quantity than OnePlus 3. |
| 64-bit Architecture | Yes | - | OnePlus 3 has 64-bit architecture. |
| Graphics System (GPU) | Qualcomm ADRENO 530 | PowerVR GE8320 |
| MEMORY | OnePlus 3 | Realme C21 |
|---|
| RAM | 6 GB | LPDDR4X SDRAM - 3 GB | OnePlus 3 has more RAM than Realme C21. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 64 GB | 32 GB | OnePlus 3 has more internal memory than Realme C21. |
| Supported Flash Memory Cards (Expandable Memory) | - | microSD |
| CAMERA | OnePlus 3 | Realme C21 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 1 | 3 | |
|---|---|---|---|
| Sensor Resolution | 16 Megapixel | 13 Megapixel | OnePlus 3 has better camera resolution than Realme C21. |
| Sensor Name | Sony Exmor RS IMX298 sensor | - | |
| Lens Aperture | F/2.0 | F/2.2 | OnePlus 3 has better lens aperture than OnePlus 3. |
| Lens Construction | - | 5-element | |
| Optical Image Stabiliser (OIS) | Optical Image Stabiliser (OIS) | - | OnePlus 3 has optical stabilisation. |
| Focus Adjustment | Automatic | Automatic | |
| Digital Zoom | - | 4x | |
| Special Effects | HDR | HDR | |
| HDR Mode | Auto HDR mode | - | |
| Camera Modes | Panorama | Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape | |
| Face Recognition (Face ID) | Face detection | - | OnePlus 3 has face detection. |
| Light Source | LED light | LED flash | |
| Video Resolutions | 3840 x 2160 (4K) at 30 fps, Slo-mo video 1280 x 720 (720p) at 120 fps | 1920 x 1080 (1080p) at 30 fps | |
| Camera Features (Functions) | Phase Detect Auto-Focus (PDAF), Electronic Image Stabiliser (EIS), geotagging | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | - | 2 Megapixel | |
|---|---|---|---|
| Lens Aperture (2nd Camera) | - | F/2.4 | |
| Lens Element Qty (2nd Camera) | - | 3-element | |
| 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 | |
| Camera Functions (3rd Camera) | - | Macro camera | |
| Camera Features (3rd Camera) | - | 4cm macro photography |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 8 Megapixel | 5 Megapixel | OnePlus 3 has better front camera resolution than Realme C21. |
| Sensor Name (Front) | Sony Exmor R IMX179 sensor | - | |
| Lens Aperture (Front) | F/2.0 | F/2.2 | OnePlus 3 has better front lens aperture than OnePlus 3. |
| Lens Element Qty (Front) | - | 3-element | |
| Focus Adjustment | Focus free | - | |
| Special Effects (Front) | - | HDR | |
| Camera Modes (Front) | - | 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 | - |
| BATTERY AND CHARGING | OnePlus 3 | Realme C21 |
|---|
| Battery Capacity (Battery Size) | 3000 mAh | 5000 mAh | Realme C21 has larger battery capacity than OnePlus 3. |
|---|---|---|---|
| Battery Technology | Lithium Ion | - |
| CELLULAR | OnePlus 3 | 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 6.0.1) | Android 10 | |
| User Interface | - | Realme UI | |
| Navigation | GPS, A-GPS, GLONASS, BeiDou | GPS, A-GPS, GLONASS, BeiDou |
| COMMUNICATIONS | OnePlus 3 | Realme C21 |
|---|
| Data Transmission | GPRS, EDGE, EV-DO, HSDPA, HSUPA, HSPA+, LTE, FDD-LTE | FDD-LTE, TDD-LTE | |
|---|---|---|---|
| 2G Band | - | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 3G UMTS Band | - | Band 1, Band 5, Band 8 | |
| 3G UMTS Frequency | - | 2100, 850, 900 | |
| 4G LTE Band | Band 1, Band 2, Band 4, Band 5, Band 7, Band 12, Band 17, Band 30 | 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 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 700a, FDD 700b, FDD 2300 WCS | 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 4.2 | Bluetooth 5.0 | |
| Bluetooth Profiles | A2DP | - | |
| NFC | Yes | - | OnePlus 3 has NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | - |
| MEDIA | OnePlus 3 | Realme C21 |
|---|
| Supported Digital Audio Standards | WAV, WMA, MP3, FLAC, eAAC+ | - | |
|---|---|---|---|
| Supported Digital Video Standards | XviD, MPEG-4, DivX, H.265 | - | |
| Sound Enhancements | Dirac sound technologies | - |
| FEATURES | OnePlus 3 | Realme C21 |
|---|
| Phone Functions | Speakerphone, call timer, conference call, flight mode, vibrating alert | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | |
|---|---|---|---|
| Sensors | Accelerometer, proximity sensor, digital compass, gyro sensor | Accelerometer, proximity sensor, magnetometer, light sensor | |
| Security Devices | Fingerprint reader | Fingerprint reader | |
| Additional Phone Features | DLNA Certified, sharing media via DLNA | Super power saving mode, HyperEngine technology, Reverse charging |
| OTHERS | OnePlus 3 | Realme C21 |
|---|
| Included Accessories | Screen protection film, USB cable, power adapter, SIM card removal tool | USB cable, power adapter, SIM card removal tool | |
|---|---|---|---|
| Compliant Standards | - | TUV Rheinland |
cs
sk
de
it
es
fr
hu
pt
ru
pl
br
ro
