| Hardware and OS | Xiaomi Mi 6X | Oppo A3s |
| Operating system | Android 8.1 Oreo OS | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Qualcomm Snapdragon 660 MSM8976 Plus, 64-bit Processor | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Qualcomm Adreno 512 graphics processor up to 650 MHz | Adreno 506 |
| RAM | 6GB | |
| Internal memory | | 16 GB, 2 GB RAM |
| Internal Storage | 128GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | microSD, microSDHC, microSDXC | |
| User Interface | Yes with MIUI 9.5 | |
| Display | Xiaomi Mi 6X | Oppo A3s |
| Type | IPS, LTPS capacitive touchscreen | IPS LCD |
| Size | 5.99 inches | 6.2" inc |
| Resolution | 2160x1080 FHD | 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 | 271 PPI |
| Protection | Yes Corning Gorilla Glass 3 | |
| Colors | 16M Colors | 16M |
| Connectivity | Xiaomi Mi 6X | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| 4G Network | LTE : 850 / 900 / 1800 / 2100 / 2600 MHz, LTE-TDD : 1900 MHz (Band 39), LTE-TDD : 2300 MHz (Band 40), LTE-TDD : 2500 MHz (Band 41), LTE-TDD : 2600 MHz (Band 38) | LTE |
| NFC | No | |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, 802.11n 5GHz, Wi-Fi Direct, Dual Band, Wi-Fi HotSpot | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| SIM | Nano SIM | |
| Bluetooth | | 4.2, A2DP, LE |
| Dual SIM | Dual Nano-SIM card slot | |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | Yes, with A-GPS, Beidou, GLONASS | Yes, with A-GPS |
| Speed | LTE Cat-12 603 Mbps Download, 102 Mbps Upload Over 4G | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | USB Type-C Two-sided Charging Interface | microUSB 2.0, USB On-The-Go |
| Camera | Xiaomi Mi 6X | Oppo A3s |
| Image | 4032 x 3024 Pixels | |
| Main camera | 20-Megapixel AI dual | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | Monochrome Temp. Flash | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | 20-Megapixel "Healing" self-timer | 8 MP, Single |
| Multimedia | Xiaomi Mi 6X | Oppo A3s |
| Loudspeaker | Yes | |
| Video Playback | Up to 7.1 Hours | |
| Video Out | Yes With Wireless Media Link | |
| Ring Tones | MP3, WAV ringtones | |
| 3.5 mm Jack | yes | Yes |
| Radio | No | FM radio |
| Design | Xiaomi Mi 6X | Oppo A3s |
| Waterproof | No | |
| Colors | | Red, Dark Purple |
| Dimensions | 158.7 mm X 75.4 mm X 7.3 mm (Height X Width X Thickness) | 156.2 x 75.6 x 8.2 mm |
| Weight | 168g | 168 g |
| Battery | Xiaomi Mi 6X | Oppo A3s |
| Capacity | 3010mAh(typ)/ 2910mAh (min) | |
| Placement | Built-in battery, no replacement | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | Xiaomi Mi 6X | Oppo A3s |
| Release date | | 2018, July |
| Sensors | Proximity Sensor, Accelerometer, Ambient Light, Compass, Gyroscope Sensor, Fingerprint ID (Rear Mounted), IR Sensor | Accelerometer, proximity, compass |
