In depth comparison and review of Realme C21 and Xiaomi POCO F3. 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 | Xiaomi POCO F3 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Touch | Touch | |
| Height | 165.2 mm | 163.7 mm | Realme C21 has greater height than Xiaomi POCO F3. |
| Width | 76.4 mm | 76.4 mm | Both phones are the same width |
| Depth | 8.9 mm | 7.8 mm | Xiaomi POCO F3 is narrower than Realme C21. |
| Weight | 190 g | 196 g | Realme C21 is lighter than Realme C21. |
| Body Colour | Cross black | Cross blue | Night black | |
| Body Material | - | Corning Gorilla Glass 5 | |
| Waterproof (Water-resistant) | - | - | |
| SAR Value | - | 0.599 W/kg (head), 0.843 W/kg (body), 1.95 W/kg (limb) | |
| Connector Type | Micro-USB Headset jack - mini-phone 3.5mm |
USB Type-C - 24 pin USB-C | |
| SIM Card Type (Size) | Nano SIM | - | |
| SIM Card Qty | Dual-SIM | Dual-SIM |
| DISPLAY | Realme C21 | Xiaomi POCO F3 |
|---|
| Display Type | LCD display | OLED display | |
|---|---|---|---|
| Display Technology | LCD | AMOLED | |
| Screen Size (Display Size) | 6.5" | 6.67" | Xiaomi POCO F3 has larger screen size than Realme C21. |
| Screen Resolution (Display Resolution) | 1600 x 720 pixels | 2400 x 1080 pixels | Xiaomi POCO F3 has better screen resolution than Realme C21. |
| Display Format | HD+ | Full HD+ | |
| Aspect Ratio | 20:9 | 20:9 | |
| Max Brightness | 420 cd/m² | 1300 cd/m² | Xiaomi POCO F3 has better display brightness than Realme C21. |
| Contrast Ratio | - | 5000000:1 | |
| HDR | - | Yes | Xiaomi POCO F3 has HDR. |
| HDR Technology | - | HDR10+ | |
| Display Refresh Rate | - | 120 Hz | |
| Touch Sampling Rate | - | 360 Hz | |
| Display Features | Mini-drop display | DCI-P3 Wide colour gamut, MEMC technology, Sunlight display 3.0 | |
| Display Protection (Screen Protector) | - | Corning Gorilla Glass 5 (scratch resistant glass) |
| PROCESSOR | Realme C21 | Xiaomi POCO F3 |
|---|
| Processor Type (CPU) | MediaTek Helio G35 | Qualcomm Snapdragon 870 | |
|---|---|---|---|
| Clock Speed | 2.3 GHz | 3.2 GHz | Xiaomi POCO F3 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 650 |
| MEMORY | Realme C21 | Xiaomi POCO F3 |
|---|
| RAM | LPDDR4X SDRAM - 3 GB | LPDDR5 SDRAM - 8 GB | Xiaomi POCO F3 has more RAM than Realme C21. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 32 GB | 256 GB | Xiaomi POCO F3 has more internal memory than Realme C21. |
| Memory Interface | - | UFS 3.1 | |
| Supported Flash Memory Cards (Expandable Memory) | microSD | - |
| CAMERA | Realme C21 | Xiaomi POCO F3 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 3 | 3 | |
|---|---|---|---|
| Sensor Resolution | 13 Megapixel | 48 Megapixel | Xiaomi POCO F3 has better camera resolution than Realme C21. |
| Lens Aperture | F/2.2 | F/1.79 | Xiaomi POCO F3 has better lens aperture than Realme C21. |
| Lens Construction | 5-element | - | |
| Pixel Size | - | 1.6 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 | Slow Shutter, Night Mode 2.0, One-Click AI Cinema, Magic Zoom, Time Freeze, Night Time-lapse, Parallel World, Freeze Frame Video | |
| 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, Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps, Slo-mo video 1280 x 720 (720p) at 120 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps, Slo-mo video 1920 x 1080 (1080p) at 960 fps, Slo-mo video 1280 x 720 (720p) at 960 fps | |
| Camera Features (Functions) | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost | AI Triple camera, 4-in-1 to 1.6μm Super Pixel |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 2 Megapixel | 8 Megapixel | Xiaomi POCO F3 has better second camera resolution than Realme C21. |
|---|---|---|---|
| Lens Type (2nd Camera) | - | Ultra wide-angle lens | |
| Lens Aperture (2nd Camera) | F/2.4 | F/2.2 | Xiaomi POCO F3 has better second camera lens aperture than Realme C21. |
| Lens Element Qty (2nd Camera) | 3-element | - | |
| Field of View (2nd Camera) | - | 119 degree(s) | |
| Camera Functions (2nd Camera) | B&W lens | - |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 2 Megapixel | 5 Megapixel | Xiaomi POCO F3 has higher resolution third camera than Realme C21. |
|---|---|---|---|
| Lens Type (3rd Camera) | - | Tele-macro lens | |
| Lens Aperture (3rd Camera) | F/2.4 | F/2.4 | Both phones have the same lens aperture of the third camera. |
| Lens Element Qty (3rd Camera) | 3-element | - | |
| Camera Functions (3rd Camera) | Macro camera | - | |
| Camera Features (3rd Camera) | 4cm macro photography | AF (3cm-7cm) |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 5 Megapixel | 20 Megapixel | Xiaomi POCO F3 has better front camera resolution than Realme C21. |
| Lens Aperture (Front) | F/2.2 | F/2.45 | Realme C21 has better front lens aperture than Realme C21. |
| 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 | Night mode, Movie frame | |
| Face Recognition (Face ID) | Face recognition | - | Realme C21 has face detection. |
| BATTERY AND CHARGING | Realme C21 | Xiaomi POCO F3 |
|---|
| Battery Capacity (Battery Size) | 5000 mAh | 4520 mAh | Realme C21 has larger battery capacity than Xiaomi POCO F3. |
|---|---|---|---|
| Recharge Time (Charging Time) | - | 52 min | |
| Standby Time | - | 268 hours | |
| Run Time Details | - | Standby: up to 268 hrs Gaming: up to 10 hrs Playback (video): up to 14 hrs Playback (Music): up to 149 hrs |
| CELLULAR | Realme C21 | Xiaomi POCO F3 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 5G | Xiaomi POCO F3 has more advanced generation mobile network. |
| Operating System | Android 10 | - | |
| User Interface | Realme UI | MIUI 12 | |
| Payment Technology | - | Google Pay | |
| Navigation | GPS, A-GPS, GLONASS, BeiDou | GPS, GLONASS, BeiDou, Galileo, NavIC |
| COMMUNICATIONS | Realme C21 | Xiaomi POCO F3 |
|---|
| Data Transmission | FDD-LTE, TDD-LTE | FDD-LTE, TDD-LTE, 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 4, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 850, 900 | 2100, 1900, 1700, 850, 900 | |
| 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 17, Band 20, Band 28, Band 38, Band 40, Band 41, Band 66 | |
| 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 700b, FDD 800 DD, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 | |
| 5G NR Band | - | N1, n3, n5, n7, n8, n20, n28, n38, n41, n77, n78 | |
| 5G NR Frequency | - | FDD 2100, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, TDD TD 3700, TDD TD 3500 | |
| Wireless Interface | IEEE 802.11b/g/n | IEEE 802.11a/b/g/n/ac/ax, Infrared (IR) | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.1 | |
| NFC | - | Yes | Xiaomi POCO F3 has NFC reader for mobile payments. |
| Modem | - | Snapdragon X55 5G |
| MEDIA | Realme C21 | Xiaomi POCO F3 |
|---|
| Sound Enhancements | - | Dolby Atmos sound technology, Hi-Res audio certified | |
|---|---|---|---|
| Video Enhancements | - | HDR10 |
| FEATURES | Realme C21 | Xiaomi POCO F3 |
|---|
| 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, proximity sensor, magnetometer, light sensor | Accelerometer, proximity sensor, digital compass, gyroscope, 360° ambient light sensor | |
| Security Devices | Fingerprint reader | Face recognition, fingerprint reader (side) | |
| Security Technology | - | AI face unlock | |
| Additional Phone Features | Super power saving mode, HyperEngine technology, Reverse charging | Infrared remote control, Three microphones, LiquidCool Technology 1.0 Plus, dual stereo speakers, X-axis linear vibration motor |
| OTHERS | Realme C21 | Xiaomi POCO F3 |
|---|
| Included Accessories | USB cable, power adapter, SIM card removal tool | Power adapter, SIM card removal tool, USB-C to 3.5 jack adapter, USB-C cable, protective case | |
|---|---|---|---|
| Compliant Standards | TUV Rheinland | SGS Eye Care Display Certification, SGS Seamless Pro 120Hz Certification |
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