| Hardware and OS | Xiaomi Mi A2 | Oppo A3s |
| Operating system | Android 8.1 Oreo (Android One) OS with MIUI 9.5 | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Octa-Core (4 x 2.0GHz Kryo 260, 4 x 1.8GHz Kryo 260) CPU Clock | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Qualcomm Adreno 512 GPU | Adreno 506 |
| RAM | 4GB/6GB | |
| Internal memory | | 16 GB, 2 GB RAM |
| Internal Storage | 32GB/64GB/128GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | External TF Card Up to 128GB (Uses SIM 2 Slot) | |
| User Interface | Yes | |
| Display | Xiaomi Mi A2 | Oppo A3s |
| Type | IPS, LCD, LTPS capacitive touchscreen | IPS LCD |
| Size | 5.99 inches FHD | 6.2" inc |
| Resolution | 2160 x 1080 Pixels, 24 bit color depth | 720 x 1520 px |
| Touchscreen | Yes Multi Touch Support | 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 A2 | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| 4G Network | Yes | 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 Hybrid SIM (Nano-SIM, Nano-SIM/MicroSD Card), Dual Standby | |
| Edge | | Yes |
| Wireless Charging | No | |
| GPRS | | Yes |
| GPS | Yes, with A-GPS, BDS, GLONASS, GPS | Yes, with A-GPS |
| Speed | 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) | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | 2.0 USB Type-C 1.0, with OTG, Host, Charging and Mass Storage Function | microUSB 2.0, USB On-The-Go |
| Camera | Xiaomi Mi A2 | Oppo A3s |
| Image | 5164 x 3873 Pixels | |
| Main camera | 20 Megapixels, 12 Megapixels Sony IMX486 (Dual Camera) | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | Yes with Dual-LED Flash | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | 20 Megapixels with Aperture f/2.0, Sony IMX376 Sensor | 8 MP, Single |
| Multimedia | Xiaomi Mi A2 | Oppo A3s |
| Loudspeaker | Yes | |
| Handsfree | Yes | |
| Video Playback | Yes Support M4V, H.264, WMV, 3GP, FLV, MP4, H.265, MKV, MOV, DivX, AVI, xVID | |
| Video Out | Yes With Wireless Media Link | |
| Ring Tones | Yes | |
| 3.5 mm Jack | yes | Yes |
| Radio | No | FM radio |
| Design | Xiaomi Mi A2 | Oppo A3s |
| Colors | | Red, Dark Purple |
| Waterproof | No | |
| Dimensions | 158.9 mm x 75.5 mm x 7.3 mm | 156.2 x 75.6 x 8.2 mm |
| Weight | 165 g | 168 g |
| Battery | Xiaomi Mi A2 | Oppo A3s |
| Capacity | 2910mAh Lithium-ion | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Placement | Non-Removable | |
| Other | Xiaomi Mi A2 | Oppo A3s |
| Release date | | 2018, July |
| Sensors | Proximity Sensor, Accelerometer, Ambient Light, Compass, Gyroscope, Fingerprint ID (Rear Mounted) | Accelerometer, proximity, compass |
