| Hardware and OS | iQOO U3x 4G | Oppo A3s |
| Operating system | Android v11 | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | 2 GHz, Octa Core Processor | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Mediatek Helio G80 | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Arm Mali-G52 | Adreno 506 |
| Internal memory | | 16 GB, 2 GB RAM |
| Ram | 4 GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Storage | 128 GB | |
| Card Slot | Yes | |
| Display | iQOO U3x 4G | Oppo A3s |
| Type | Color IPS LCD Screen (16M Colors) | IPS LCD |
| Size | 6.58 inches, 1080 x 2408 pixels | 6.2" inc |
| Resolution | | 720 x 1520 px |
| Touchscreen | | capacitive touchscreen |
| Aspect Ratio | 20:9 | |
| Screen-to-Body Ratio | | 81.2% |
| PPI | ~400 PPI | |
| Display area | | 95.9 cm2 |
| Screen to Body Ratio | ~ 84.7% | |
| Display aspect ratio | | 19:9 (height:width) |
| Touch | Yes, with Multitouch | |
| Pixel Density | | 271 PPI |
| Colors | | 16M |
| Main Camera | iQOO U3x 4G | Oppo A3s |
| Camera | 8 MP f/2 (Wide Angle) | |
| Flash | Yes, LED | |
| Features | HDR, Panorama | |
| Video | 1080p @ 30fps FHD | |
| Connectivity | iQOO U3x 4G | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | Yes | HSDPA 850 / 900 / 2100 |
| 4G Network | Yes | LTE |
| Wi-Fi | | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | Yes, v5.1, A2DP, LE | 4.2, A2DP, LE |
| Edge | Yes | Yes |
| GPRS | Yes | Yes |
| 5G Network | No | |
| GPS | Yes, with A-GPS, GLONASS, BDS, GALILEO | Yes, with A-GPS |
| Speed | | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | Yes, USB-C v2.0 | microUSB 2.0, USB On-The-Go |
| USB Features | USB on-the-go, USB Charging | |
| VoLTE | Yes, Dual Stand-By | |
| Wifi | Yes, with wifi-hotspot | |
| Selfie camera | iQOO U3x 4G | Oppo A3s |
| Camera | 13 MP f/2.2 (Wide Angle)
2 MP f/2.4 (Depth Sensor) with autofocus | |
| Video | 4K @ 30fps UHD, 1080p @ 30fps FHD | |
| Camera | iQOO U3x 4G | Oppo A3s |
| Main camera | | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | | 8 MP, Single |
| Multimedia | iQOO U3x 4G | Oppo A3s |
| 3.5 mm Jack | Yes | Yes |
| Radio | | FM radio |
| Design | iQOO U3x 4G | Oppo A3s |
| Colors | | Red, Dark Purple |
| Dimensions | 76.32 x 164.41 x 8.41 mm | 156.2 x 75.6 x 8.2 mm |
| Weight | 191.4 g | 168 g |
| Dual Sim | Yes | |
| Sim Type | Dual Sim, GSM GSM | |
| Sim Size | Nano Nano SIM | |
| Battery | iQOO U3x 4G | Oppo A3s |
| Type | Non-Removable Battery | |
| Fast Charging | Yes, 18W Fast Charging | |
| Battery capacity | 5000 mAh, Li-Po Battery | 4230 mAh, Non-removable Li-Ion |
| Other | iQOO U3x 4G | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
| Features | iQOO U3x 4G | Oppo A3s |
| Sensors | Accelerometer, Gyro, Proximity, Compass | |
| Fingerprint Sensor | Yes, Side | |
| Face Unlock | Yes | |
