| Hardware and OS | Realme X3 | |
| Operating System | Android v10 (Q) | |
| Custom UI | Realme UI | |
| Processor | Octa core (2.96 GHz, Single core, Kryo 485 2.42 GHz, Tri core, Kryo 485 1.8 GHz, Quad core, Kryo 485) | |
| Chipset | Qualcomm Snapdragon 855 Plus | |
| Architecture | 64 bit | |
| RAM | 6 GB | |
| Internal Memory | 128 GB | |
| Expandable Memory | No | |
| Graphics | Adreno 640 | |
| SIM Slot(s) | Dual SIM, GSM GSM | |
| Display | Realme X3 | other phones |
| Screen Size | 6.6 inches (16.76 cm) | |
| Screen Resolution | 1080 x 2400 pixels | |
| Display Type | IPS LCD | |
| Pixel Density | 399 ppi | |
| Aspect Ratio | 20:9 | |
| Refresh Rate | 120 Hz | |
| Screen to Body Ratio | 90.5 % | |
| Screen Protection | Corning Gorilla Glass v5 | |
| Touch Screen | yes Capacitive Touchscreen, Multi-touch | |
| Main Camera | Realme X3 | other phones |
| Image Resolution | 9000 x 7000 Pixels | |
| Flash | yes LED Flash | |
| Sensor | ISOCELL Plus | |
| Camera Features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
| Autofocus | yes Phase Detection autofocus | |
| Physical Aperture | F1.8 | |
| Video Recording | 3840x2160 @ 30 fps, 1920x1080 @ 60 fps | |
| Shooting Modes | Continuos Shooting, High Dynamic Range mode (HDR) | |
| Settings | Exposure compensation, ISO control | |
| Front Camera | Realme X3 | other phones |
| Resolution | 16 MP f/2.1, Wide Angle (105° field-of-view) Primary Camera(3" sensor size, 1µm pixel size)8 MP f/2.2, Wide Angle, Ultra-Wide Angle (105° field-of-view) Camera(4.0" sensor size, 1.12µm pixel size) | |
| Sensor | Exmor RS | |
| Physical Aperture | F2.1 | |
| Video Recording | 1920x1080 @ 30 fps, 1280x720 @ 30 fps | |
| Connectivity | Realme X3 | other phones |
| Network | 4G: Available ,
3G: Available, 2G: Available | |
| SIM Size | SIM1: Nano, SIM2: Nano | |
| Bluetooth | yes v5.0 | |
| GPS | yes with A-GPS, Glonass | |
| NFC | No | |
| VoLTE | yes | |
| Wi-Fi | yes Wi-Fi 802.11, ac/b/g/n/n 5GHz, MIMO | |
| Wi-Fi Features | Mobile Hotspot | |
| USB Connectivity | Mass storage device, USB charging | |
| Multimedia | Realme X3 | other phones |
| Audio Features | Dolby Atmos | |
| Audio Jack | USB Type-C | |
| FM Radio | No | |
| Design | Realme X3 | other phones |
| Height | 163.8 mm | |
| Width | 75.8 mm | |
| Thickness | 8.9 mm | |
| Weight | 202 grams | |
| Build Material |
Back: Mineral Glass | |
| Colours | Glacier Blue, Arctic White | |
| Battery | Realme X3 | other phones |
| Type | Li-ion | |
| Capacity | 4200 mAh | |
| User Replaceable | No | |
| Quick Charging | yes Super Dart, 30W: 100 % in 55 minutes | |
| USB Type-C | yes | |
| USB OTG Support | yes | |
| Features | Realme X3 | other phones |
| Fingerprint Sensor | yes | |
| Fingerprint Sensor Position | Side | |
| Other Sensors | Light sensor, Proximity sensor, Accelerometer, Gyroscope | |
