In depth comparison and review of OnePlus 5T 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 5T | Realme C21 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Touch | Touch | |
| Height | 156.1 mm | 165.2 mm | Realme C21 has greater height than OnePlus 5T. |
| Width | 75 mm | 76.4 mm | Realme C21 has greater width than OnePlus 5T. |
| Depth | 7.3 mm | 8.9 mm | OnePlus 5T is narrower than OnePlus 5T. |
| Weight | 162 g | 190 g | OnePlus 5T is lighter than OnePlus 5T. |
| Body Colour | Midnight black | Cross black | Cross blue | |
| Body Material | Anodised aluminium | - | |
| Waterproof (Water-resistant) | - | - | |
| 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 5T | Realme C21 |
|---|
| Display Type | OLED display | LCD display | |
|---|---|---|---|
| Display Technology | Optic AMOLED | LCD | |
| Screen Size (Display Size) | 6.01" | 6.5" | Realme C21 has larger screen size than OnePlus 5T. |
| Screen Resolution (Display Resolution) | 2160 x 1080 pixels | 1600 x 720 pixels | OnePlus 5T has better screen resolution than Realme C21. |
| Display Format | - | HD+ | |
| Pixel Density | 401 ppi | - | |
| Aspect Ratio | - | 20:9 | |
| Max Brightness | - | 420 cd/m² | |
| Display Features | 2.5D Glass, Sunlight Display | Mini-drop display | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 5 (scratch resistant glass) | - |
| PROCESSOR | OnePlus 5T | Realme C21 |
|---|
| Processor Type (CPU) | Qualcomm Snapdragon 835 | MediaTek Helio G35 | |
|---|---|---|---|
| Clock Speed | 2.45 GHz | 2.3 GHz | OnePlus 5T 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 5T has 64-bit architecture. |
| Graphics System (GPU) | Qualcomm ADRENO 540 | PowerVR GE8320 |
| MEMORY | OnePlus 5T | Realme C21 |
|---|
| RAM | LPDDR4X SDRAM - 6 GB | LPDDR4X SDRAM - 3 GB | OnePlus 5T has more RAM than Realme C21. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 64 GB | 32 GB | OnePlus 5T has more internal memory than Realme C21. |
| Supported Flash Memory Cards (Expandable Memory) | - | microSD |
| CAMERA | OnePlus 5T | Realme C21 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 2 | 3 | |
|---|---|---|---|
| Sensor Resolution | 16 Megapixel | 13 Megapixel | OnePlus 5T has better camera resolution than Realme C21. |
| Sensor Name | Sony Exmor RS IMX398 sensor | - | |
| Lens Aperture | F/1.7 | F/2.2 | OnePlus 5T has better lens aperture than OnePlus 5T. |
| Lens Construction | - | 5-element | |
| Focus Adjustment | Automatic | Automatic | |
| Minimum Focal Length (Focal Distance) | 27.22 mm | - | |
| Digital Zoom | - | 4x | |
| Special Effects | - | HDR | |
| Camera Modes | Time-lapse 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, 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) | Quick Capture, Fast AF, Electronic Image Stabiliser (EIS), Intelligent Pixel Technology | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 20 Megapixel | 2 Megapixel | OnePlus 5T has better second camera resolution than Realme C21. |
|---|---|---|---|
| Sensor Name (2nd Camera) | Sony Exmor RS IMX376K sensor | - | |
| Lens Aperture (2nd Camera) | F/1.7 | F/2.4 | OnePlus 5T has better second camera lens aperture than OnePlus 5T. |
| 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) | 16 Megapixel | 5 Megapixel | OnePlus 5T 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 5T has better front lens aperture than OnePlus 5T. |
| Lens Element Qty (Front) | - | 3-element | |
| Special Effects (Front) | - | HDR | |
| Camera Modes (Front) | Time-lapse mode | 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, 1280 x 720 (720p) at 30 fps | - |
| BATTERY AND CHARGING | OnePlus 5T | Realme C21 |
|---|
| Battery Capacity (Battery Size) | 3300 mAh | 5000 mAh | Realme C21 has larger battery capacity than OnePlus 5T. |
|---|---|---|---|
| Fast Charging Technology | Dash Charge technology | - | OnePlus 5T has fast charging technology. |
| CELLULAR | OnePlus 5T | 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 7.1.1) | Android 10 | |
| User Interface | - | Realme UI | |
| Navigation | GPS, GLONASS, BeiDou, Galileo | GPS, A-GPS, GLONASS, BeiDou |
| COMMUNICATIONS | OnePlus 5T | Realme C21 |
|---|
| Data Transmission | GPRS, EDGE, EV-DO, HSDPA, HSUPA, HSPA+, 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 1, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 900 | 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 34, 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 1900+, FDD 850+, FDD 700 APT, FDD 700d, FDD 2300 WCS, TDD 2000, 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 | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac | IEEE 802.11b/g/n | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.0 | |
| NFC | Yes | - | OnePlus 5T has NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | - |
| MEDIA | OnePlus 5T | 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 HD Sound, Supports AANC | - |
| FEATURES | OnePlus 5T | 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, G-sensor, hall sensor, RGB sensor | Accelerometer, proximity sensor, magnetometer, light sensor | |
| Security Devices | Face recognition, fingerprint reader | Fingerprint reader | |
| Additional Phone Features | Face Unlock, MIMO technology, Android Sensor Hub, Three microphones with noise-cancellation | Super power saving mode, HyperEngine technology, Reverse charging |
| OTHERS | OnePlus 5T | Realme C21 |
|---|
| Included Accessories | SIM card removal tool, Dash Charge Type-C Cable, Dash Charge Adapter, pre-installed screen protector, translucent case | USB cable, power adapter, SIM card removal tool | |
|---|---|---|---|
| Compliant Standards | - | TUV Rheinland |
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