| Hardware and OS | Nubia Z18 Mini | Oppo A3s |
| Operating system | Android 8.1.0 | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Qualcomm Snapdragon 660 AIE | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Adreno 512 graphics processor | Adreno 506 |
| RAM | 6GB RAM | |
| Internal memory | | 16 GB, 2 GB RAM |
| Internal Storage | 64GB/128GB ROM | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | Dual Nano SIM card slot, any card slot can be set as a network card | |
| User Interface | Z18mini customized version UI based | |
| Display | Nubia Z18 Mini | Oppo A3s |
| Type | LTPS 18:9 full screen | IPS LCD |
| Size | 5.7-inch | 6.2" inc |
| Resolution | 2160 X 1080 pixels | 720 x 1520 px |
| Touchscreen | | capacitive touchscreen |
| Screen-to-Body Ratio | | 81.2% |
| Display area | | 95.9 cm2 |
| Protection | Not Included | |
| Display aspect ratio | | 19:9 (height:width) |
| Features | 5.7-inch 18:9 full screen, 2160 X 1080 pixels, 85% Color saturation, 428 PPI , 480 brightness, LTPS, Contrast 1500 | |
| Pixel Density | 428 | 271 PPI |
| Colors | | 16M |
| Connectivity | Nubia Z18 Mini | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| NFC | No | |
| 4G Network | TD-LTE B38/B39 / B40/B41/B34, FDD-LTE B1/B3/B5/B8/B19 (4G/3G/2G networks can be supported) | LTE |
| SIM | Standard SIM | |
| Wi-Fi | Full Netcom dual-band WI-FI | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Dual SIM | Dual Nano SIM card slot (any card slot can be set as a network card) | |
| Network | | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | | 4.2, A2DP, LE |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | GPS Navigation, GLONASS Navigation, BeiDou Navigation | Yes, with A-GPS |
| Speed | | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | | microUSB 2.0, USB On-The-Go |
| Camera | Nubia Z18 Mini | Oppo A3s |
| Main camera | 24MP, 5MP with CMOS sensor, 0.1 seconds focusing speed, F1.7 aperture, and NeoVision 7.0 | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | No, Without Flash | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | 8MP with AI beauty pre-filling light, F2.0 aperture, and 1.12um large pixels | 8 MP, Single |
| Multimedia | Nubia Z18 Mini | Oppo A3s |
| 3.5 mm Jack | yes | Yes |
| Radio | | FM radio |
| Design | Nubia Z18 Mini | Oppo A3s |
| Colors | | Red, Dark Purple |
| Dimensions | 148.0 X 70.6 X 7.6mm | 156.2 x 75.6 x 8.2 mm |
| Weight | 153g | 168 g |
| Battery | Nubia Z18 Mini | Oppo A3s |
| Capacity | 3450mAh | |
| Placement | Non-Removable | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | Nubia Z18 Mini | Oppo A3s |
| Release date | | 2018, July |
| Sensors | Light Sensor / Distance Sensor / Compass / Gyro / Fingerprint Sensor | Accelerometer, proximity, compass |
