| Hardware and OS | UMIDIGI S3 Pro | Oppo A3s |
| Operating system | Stock Android 9 Pie, Luxury Ceramic Design | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | MTK, Helio P70, 4xCortex-A73, 2.1GHz, 4xCortex-A53, 2.0GHz | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | ARM Mali G72 MP3 900MHz | Adreno 506 |
| RAM | 6 GB | |
| Internal memory | | 16 GB, 2 GB RAM |
| Internal Storage | 128 GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | microSD expansion memory card | |
| User Interface | Yes | |
| Display | UMIDIGI S3 Pro | Oppo A3s |
| Type | FHD Waterdrop Full Screen | IPS LCD |
| Size | 6.3 inches | 6.2" inc |
| Resolution | 2340 x 1080 | 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 | 409 ppi | 271 PPI |
| Features | Color temperature adjustment, Reading mode, 19.5 : 9 Waterdrop advanced in-cell LTPS Display | |
| Colors | 16M | 16M |
| Connectivity | UMIDIGI S3 Pro | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| 4G Network | Supports 5G | LTE |
| NFC | yes | |
| Wi-Fi | IEEE802.11 a/b/g/n/ac, Supports 5G Wi-Fi Signal / Wi-Fi Direct / Supports Wi-Fi Display | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | | GSM / HSPA / LTE |
| SIM | Nano SIM | |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Dual SIM | Yes | |
| Bluetooth | | 4.2, A2DP, LE |
| Wireless Charging | No | |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | GPS, GLONASS | Yes, with A-GPS |
| Speed | | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | Type-C USB | microUSB 2.0, USB On-The-Go |
| Camera | UMIDIGI S3 Pro | Oppo A3s |
| Image | IMX586 Sony flagship sensor | |
| Main camera | 48MP | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | Dual LED flash | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | 20MP | 8 MP, Single |
| Multimedia | UMIDIGI S3 Pro | Oppo A3s |
| Loudspeaker | Yes | |
| Handsfree | Yes | |
| Video Playback | Yes | |
| Video Out | Yes | |
| Ring Tones | No | |
| 3.5 mm Jack | yes | Yes |
| Radio | Yes | FM radio |
| Design | UMIDIGI S3 Pro | Oppo A3s |
| Waterproof | No | |
| Colors | | Red, Dark Purple |
| Dimensions | 157 x 74.65 x 8.5 mm | 156.2 x 75.6 x 8.2 mm |
| Weight | 216.6 g | 168 g |
| Battery | UMIDIGI S3 Pro | Oppo A3s |
| Capacity | 5150mAh Powerful Battery, 18W Fast Charging | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | UMIDIGI S3 Pro | Oppo A3s |
| Release date | | 2018, July |
| Sensors | Sensors, P-Sensor , L-Sensor , Accelerometer , Gyroscope , Geomagnetic Sensor | Accelerometer, proximity, compass |
