In depth comparison and review of Realme C21 and ASUS ROG Phone 5s Pro. 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 | ASUS ROG Phone 5s Pro |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | - | ZS676KS | |
| Form Factor | Touch | Touch | |
| Height | 165.2 mm | 172.83 mm | ASUS ROG Phone 5s Pro has greater height than Realme C21. |
| Width | 76.4 mm | 77.25 mm | ASUS ROG Phone 5s Pro has greater width than Realme C21. |
| Depth | 8.9 mm | 9.9 mm | Realme C21 is narrower than Realme C21. |
| Weight | 190 g | 238 g | Realme C21 is lighter than Realme C21. |
| Body Colour | Cross black | Cross blue | Phantom black | |
| Body Material | - | Glass | |
| Waterproof (Water-resistant) | - | - | |
| SAR Value | - | 1.561 W/kg (body), 1.331 W/kg (head), 3.583 W/kg (limb) | |
| Connector Type | Micro-USB Headset jack - mini-phone 3.5mm |
USB Type-C - 24 pin USB-C Headset jack - mini-phone 3.5mm |
|
| SIM Card Type (Size) | Nano SIM | Nano SIM | |
| SIM Card Qty | Dual-SIM | Dual-SIM |
| DISPLAY | Realme C21 | ASUS ROG Phone 5s Pro |
|---|
| Display Type | LCD display | OLED display | |
|---|---|---|---|
| Display Technology | LCD | AMOLED | |
| Screen Size (Display Size) | 6.5" | 6.78" | ASUS ROG Phone 5s Pro has larger screen size than Realme C21. |
| Screen Resolution (Display Resolution) | 1600 x 720 pixels | 2448 x 1080 pixels | ASUS ROG Phone 5s Pro has better screen resolution than Realme C21. |
| Display Format | HD+ | Full HD+ | |
| Aspect Ratio | 20:9 | 20.4:9 | |
| Max Brightness | 420 cd/m² | - | |
| HDR | - | Yes | ASUS ROG Phone 5s Pro has HDR. |
| HDR Technology | - | HDR10+ | |
| Display Enhancement Technology | - | Eye Care | |
| Display Refresh Rate | - | 144 Hz | |
| Touch Sampling Rate | - | 360 Hz | |
| Display Features | Mini-drop display | Always-on display, DC Dimming, Delta-E < 1 | |
| Display Protection (Screen Protector) | - | Corning Gorilla Glass Victus (scratch resistant glass) |
| PROCESSOR | Realme C21 | ASUS ROG Phone 5s Pro |
|---|
| Processor Type (CPU) | MediaTek Helio G35 | Qualcomm Snapdragon 888+ | |
|---|---|---|---|
| Processor Number | - | SM8350 | |
| Clock Speed | 2.3 GHz | 3 GHz | ASUS ROG Phone 5s Pro 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 | Qualcomm ADRENO 660 |
| MEMORY | Realme C21 | ASUS ROG Phone 5s Pro |
|---|
| RAM | LPDDR4X SDRAM - 3 GB | LPDDR5 SDRAM - 18 GB | ASUS ROG Phone 5s Pro has more RAM than Realme C21. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 32 GB | 512 GB | ASUS ROG Phone 5s Pro has more internal memory than Realme C21. |
| Memory Interface | - | UFS 3.1 | |
| Supported Flash Memory Cards (Expandable Memory) | microSD | - |
| CAMERA | Realme C21 | ASUS ROG Phone 5s Pro |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 3 | 3 | |
|---|---|---|---|
| Sensor Resolution | 13 Megapixel | 64 Megapixel | ASUS ROG Phone 5s Pro has better camera resolution than Realme C21. |
| Sensor Size | - | 1/1.73" | |
| Sensor Name | - | Sony Exmor RS IMX686 sensor | |
| Lens Type | - | Wide-angle lens | |
| Lens Aperture | F/2.2 | F/1.8 | ASUS ROG Phone 5s Pro has better lens aperture than Realme C21. |
| Lens Construction | 5-element | - | |
| Pixel Size | - | 0.8 μm | |
| 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 | 4K Timelapse, Pro Video mode | |
| Light Source | LED flash | 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, 3840 x 2160 (4K) at 30 fps, 3840 x 2160 (4K) at 60 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps, Slo-mo video 1280 x 720 (720p) at 480 fps, 7680 x 4320 (8K) at 30fps, Slo-mo video 3840 x 2160 (4K) at 120 fps | |
| Camera Features (Functions) | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost | 3-axis electronic image stabilisation, Wind Noise Filter, Free Zoom |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 2 Megapixel | 13 Megapixel | ASUS ROG Phone 5s Pro has better second camera resolution than Realme C21. |
|---|---|---|---|
| Lens Type (2nd Camera) | - | Ultra wide-angle lens | |
| 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 | 5 Megapixel | ASUS ROG Phone 5s Pro has higher resolution third camera than Realme C21. |
|---|---|---|---|
| Lens Aperture (3rd Camera) | F/2.4 | - | |
| Lens Element Qty (3rd Camera) | 3-element | - | |
| 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 | 24 Megapixel | ASUS ROG Phone 5s Pro has better front camera resolution than Realme C21. |
| Lens Aperture (Front) | F/2.2 | - | |
| Lens Element Qty (Front) | 3-element | - | |
| Focal Length Equivalent to 35mm Camera | - | 27mm | |
| 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 | Realme C21 | ASUS ROG Phone 5s Pro |
|---|
| Battery Capacity (Battery Size) | 5000 mAh | 6000 mAh | ASUS ROG Phone 5s Pro has larger battery capacity than Realme C21. |
|---|---|---|---|
| Fast Charging Technology | - | Power Delivery 3.0, Qualcomm Quick Charge 5.0 | ASUS ROG Phone 5s Pro has fast charging technology. |
| Battery Technology | - | Lithium polymer |
| CELLULAR | Realme C21 | ASUS ROG Phone 5s Pro |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 5G | ASUS ROG Phone 5s Pro has more advanced generation mobile network. |
| Operating System | Android 10 | Android 11 | |
| User Interface | Realme UI | ROG UI | |
| Navigation | GPS, A-GPS, GLONASS, BeiDou | GPS, GLONASS, BeiDou, Galileo, QZSS, NavIC |
| COMMUNICATIONS | Realme C21 | ASUS ROG Phone 5s Pro |
|---|
| Data Transmission | FDD-LTE, TDD-LTE | GPRS, EDGE, HSPA+, FDD-LTE, TDD-LTE, DC-HSPA+, 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 3, Band 4, Band 5, Band 6, Band 8, Band 19 | |
| 3G UMTS Frequency | 2100, 850, 900 | 2100, 1900, 1800, 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 13, 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 42, Band 48, Band 66, Band 71 | |
| 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 700c, 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, TDD 3500, TDD 3600, FDD 1700 - 2110 AWS-3, FDD 600 | |
| 5G NR Band | - | N1, n2, n3, n5, n7, n8, n20, n28, n38, n41, n66, n71, n77, n78, n79, n40, n25, n12 | |
| 5G NR Frequency | - | FDD 2100, FDD 1900PCS, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, FDD AWS-3, FDD 600, TDD TD 3700, TDD TD 3500, TDD TD 4500, TDD 2300, FDD 1900, n12 | |
| Wireless Interface | IEEE 802.11b/g/n | IEEE 802.11a/b/g/n/ac/ax | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.2 EDR | |
| Bluetooth Profiles | - | HFP, OPP, PAN, A2DP, AVRCP, HID | |
| NFC | - | Yes | ASUS ROG Phone 5s Pro has NFC reader for mobile payments. |
| MEDIA | Realme C21 | ASUS ROG Phone 5s Pro |
|---|
| Supported Digital Audio Standards | - | Apt-X, apt-X HD | |
|---|---|---|---|
| Sound Enhancements | - | Dirac HD Sound, ASUS Audio Wizard, Hi-Res audio, Qualcomm aptX Adaptive, GameFX | |
| Audio Processor | - | ESS DAC 9280AC |
| FEATURES | Realme C21 | ASUS ROG Phone 5s Pro |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | - | |
|---|---|---|---|
| Sensors | Accelerometer, proximity sensor, magnetometer, light sensor | Accelerometer, ambient light sensor, proximity sensor, digital compass, gyro sensor, ultrasonic sensor, gyroscope | |
| Security Devices | Fingerprint reader | Fingerprint reader (under display) | |
| Additional Phone Features | Super power saving mode, HyperEngine technology, Reverse charging | MIMO technology, 4-Mics, ASUS Noise Reduction technology, ARCore, Aura RGB lighting, GameFX audio system, AirTrigger 5 |
| OTHERS | Realme C21 | ASUS ROG Phone 5s Pro |
|---|
| Included Accessories | USB cable, power adapter, SIM card removal tool | SIM card removal tool, USB-C to USB-C cable, Aero Case, AeroActive Cooler 5, USB power adapter (65 W), 3 months of Stadia Pro | |
|---|---|---|---|
| Compliant Standards | TUV Rheinland | - |
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