In depth comparison and review of ASUS ROG Phone 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 | ASUS ROG Phone 3 | Realme C21 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | ZS661KS | - | |
| Form Factor | Touch | Touch | |
| Height | 171 mm | 165.2 mm | ASUS ROG Phone 3 has greater height than Realme C21. |
| Width | 78 mm | 76.4 mm | ASUS ROG Phone 3 has greater width than Realme C21. |
| Depth | 9.85 mm | 8.9 mm | Realme C21 is narrower than ASUS ROG Phone 3. |
| Weight | 240 g | 190 g | Realme C21 is lighter than ASUS ROG Phone 3. |
| Body Colour | Black glare | Cross black | Cross blue | |
| Waterproof (Water-resistant) | - | - | |
| Integrated Components | FM radio | - | |
| Connector Type | USB Type-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 | ASUS ROG Phone 3 | Realme C21 |
|---|
| Display Type | OLED display | LCD display | |
|---|---|---|---|
| Display Technology | AMOLED | LCD | |
| Screen Size (Display Size) | 6.59" | 6.5" | ASUS ROG Phone 3 has larger screen size than Realme C21. |
| Screen Resolution (Display Resolution) | 2340 x 1080 pixels | 1600 x 720 pixels | ASUS ROG Phone 3 has better screen resolution than Realme C21. |
| Display Format | - | HD+ | |
| Aspect Ratio | 19.5:9 | 20:9 | |
| Max Brightness | - | 420 cd/m² | |
| HDR | Yes | - | ASUS ROG Phone 3 has HDR. |
| Display Refresh Rate | 144 Hz | - | |
| Display Features | - | Mini-drop display |
| PROCESSOR | ASUS ROG Phone 3 | Realme C21 |
|---|
| Processor Type (CPU) | Qualcomm Snapdragon 865 | MediaTek Helio G35 | |
|---|---|---|---|
| Processor Number | SM8250 | - | |
| Clock Speed | 2.84 GHz | 2.3 GHz | ASUS ROG Phone 3 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 | - | ASUS ROG Phone 3 has 64-bit architecture. |
| Graphics System (GPU) | Qualcomm ADRENO 650 | PowerVR GE8320 |
| MEMORY | ASUS ROG Phone 3 | Realme C21 |
|---|
| RAM | LPDDR4X SDRAM - 8 GB | LPDDR4X SDRAM - 3 GB | ASUS ROG Phone 3 has more RAM than Realme C21. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 256 GB | 32 GB | ASUS ROG Phone 3 has more internal memory than Realme C21. |
| Supported Flash Memory Cards (Expandable Memory) | - | microSD |
| CAMERA | ASUS ROG Phone 3 | Realme C21 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 2 | 3 | |
|---|---|---|---|
| Sensor Resolution | 64 Megapixel | 13 Megapixel | ASUS ROG Phone 3 has better camera resolution than Realme C21. |
| Lens Aperture | - | F/2.2 | |
| Lens Construction | - | 5-element | |
| Focus Adjustment | Automatic | Automatic | |
| Digital Zoom | - | 4x | |
| Special Effects | - | HDR | |
| Camera Modes | - | 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 | |
| Camera Features (Functions) | - | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 13 Megapixel | 2 Megapixel | ASUS ROG Phone 3 has better second camera resolution than Realme C21. |
|---|---|---|---|
| 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) | 24 Megapixel | 5 Megapixel | ASUS ROG Phone 3 has better front camera resolution than Realme C21. |
| Lens Aperture (Front) | - | F/2.2 | |
| Lens Element Qty (Front) | - | 3-element | |
| 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. |
| BATTERY AND CHARGING | ASUS ROG Phone 3 | Realme C21 |
|---|
| Battery Capacity (Battery Size) | 6000 mAh | 5000 mAh | ASUS ROG Phone 3 has larger battery capacity than Realme C21. |
|---|---|---|---|
| Fast Charging Technology | Qualcomm Quick Charge 4.0, Asus ROG HyperCharge | - | ASUS ROG Phone 3 has fast charging technology. |
| CELLULAR | ASUS ROG Phone 3 | Realme C21 |
|---|
| Technology | TD-SCDMA / WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 5G | 4G | ASUS ROG Phone 3 has more advanced generation mobile network. |
| Operating System | Android 10 | Android 10 | |
| User Interface | ROG UI | Realme UI | |
| Navigation | GPS, GLONASS, BeiDou, Galileo, QZSS | GPS, A-GPS, GLONASS, BeiDou |
| COMMUNICATIONS | ASUS ROG Phone 3 | Realme C21 |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, LTE, FDD-LTE, TDD-LTE, 5G NR | 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 5, Band 8 | |
| 3G UMTS Frequency | - | 2100, 850, 900 | |
| 4G LTE Band | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 20, Band 28, Band 34, Band 38, Band 39, Band 40, Band 41 | 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 800 DD, FDD 700 APT, TDD 2000, TDD 2600, TDD 1900, TDD 2300, TDD 2500 | 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 802.11a/b/g/n/ac/ax | IEEE 802.11b/g/n | |
| Bluetooth | Bluetooth 5.1 | Bluetooth 5.0 | |
| Bluetooth Profiles | HFP, OPP, PAN, A2DP, AVRCP, HID | - | |
| NFC | Yes | - | ASUS ROG Phone 3 has NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | - |
| MEDIA | ASUS ROG Phone 3 | Realme C21 |
|---|
| Supported Digital Audio Standards | Apt-X, apt-X HD | - |
|---|
| FEATURES | ASUS ROG Phone 3 | 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, ultrasonic sensor | Accelerometer, proximity sensor, magnetometer, light sensor | |
| Security Devices | Fingerprint reader (under display), face recognition | Fingerprint reader | |
| Additional Phone Features | MIMO technology, Four microphones with Noise Reduction technology | Super power saving mode, HyperEngine technology, Reverse charging |
| OTHERS | ASUS ROG Phone 3 | Realme C21 |
|---|
| Included Accessories | SIM card removal tool, USB-C to 3.5 jack adapter, USB-C cable, protective case, 30W fast charger, AeroCooler 3 Fan with USB-C and 3.5mm audio jack | USB cable, power adapter, SIM card removal tool | |
|---|---|---|---|
| Compliant Standards | - | TUV Rheinland |
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