| Hardware and OS | Xiaomi Mi 9X | Oppo A3s |
| Operating system | Android 9.0 (Pie); MIUI 10 | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Octa-core (2x2.0 GHz Kryo 460 Gold & 6x1.7 GHz Kryo 460 Silver) | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Adreno 612 | Adreno 506 |
| RAM | 6GB | |
| Internal memory | | 16 GB, 2 GB RAM |
| Internal Storage | 64 GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | microSD, microSDHC, microSDXC | |
| User Interface | Yes | |
| Display | Xiaomi Mi 9X | Oppo A3s |
| Type | Super AMOLED | IPS LCD |
| Size | 6.39 inches, 100.2 cm2 | 6.2" inc |
| Resolution | 1080 x 2340 pixels, 19.5:9 ratio | 720 x 1520 px |
| Touchscreen | Yes | capacitive touchscreen |
| Screen-to-Body Ratio | | 81.2% |
| Display area | | 95.9 cm2 |
| Display aspect ratio | | 19:9 (height:width) |
| Pixel Density | ~403 ppi density | 271 PPI |
| Protection | Yes Corning Gorilla Glass 6 | |
| Colors | 16 Millions Colors | 16M |
| Features | Fingerprint, accelerometer, gyro, proximity, compass | |
| Connectivity | Xiaomi Mi 9X | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| 4G Network | Yes | LTE |
| Wi-Fi | a, b, g, n, n 5GHz, ac, Dual band, Wi-Fi Hotspot, Wi-Fi Direct, Wi-Fi Display | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| NFC | No | |
| Network | | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | | 4.2, A2DP, LE |
| SIM | Nano SIM | |
| Edge | | Yes |
| Dual SIM | Nano-SIM, Nano-SIM / microSD | |
| GPRS | | Yes |
| Wireless Charging | No | |
| GPS | A-GPS, GPS (L1 L5), GLONASS (L1), BeiDou (B1), Galileo (E1 E5a) | Yes, with A-GPS |
| Speed | LTE 850 MHz LTE 900 MHz LTE 1800 MHz LTE 2100 MHz LTE 2600 MHz LTE-TDD 1900 MHz (B39) LTE-TDD 2300 MHz (B40) LTE-TDD 2500 MHz (B41) LTE-TDD 2600 MHz (B38) LTE 700 MHz (B12) | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | 2.0, USB Type-C | microUSB 2.0, USB On-The-Go |
| Camera | Xiaomi Mi 9X | Oppo A3s |
| Image | 5000 x 3000 Pixels | |
| Main camera | 48 MP, f/1.8, 27mm (wide), 1/2", 0.8??m, PDAF | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | Dual-LED flash, HDR, panorama | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | 32 MP, f/2.0 | 8 MP, Single |
| Multimedia | Xiaomi Mi 9X | Oppo A3s |
| 3.5 mm Jack | yes | Yes |
| Radio | | FM radio |
| Design | Xiaomi Mi 9X | Oppo A3s |
| Waterproof | No | |
| Colors | | Red, Dark Purple |
| Dimensions | | 156.2 x 75.6 x 8.2 mm |
| Weight | | 168 g |
| Battery | Xiaomi Mi 9X | Oppo A3s |
| Capacity | 3300 mAh Lithium-Polymer | |
| Placement | Non-Removable | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | Xiaomi Mi 9X | Oppo A3s |
| Release date | | 2018, July |
| Sensors | Accelerometer, Ambient Light Sensor, E Compass, Fingerprint Scanner, Gyroscope, Hall Sensor, In-display fingerprint sensor, Proximity | Accelerometer, proximity, compass |
