| BLU Advance A4 2019 |
Oppo A3s |
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| Hardware and OS | BLU Advance A4 2019 | Oppo A3s |
| Operating system | Android 8.1 Oreo Go | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Processor clock: 1.30 GHz | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Qualcomm SDM450 Snapdragon 450 (14 nm) | |
| RAM memory | 512 MB | |
| GPU | Adreno 506 | |
| Internal memory | 16 GB | 16 GB, 2 GB RAM |
| Memory cards | yes microSD, microSDHC, microSDXC (up to 64 GB) | |
| External memory | microSD, up to 256 GB (dedicated slot) | |
| Display | BLU Advance A4 2019 | Oppo A3s |
| Display | Color / TFT 16M colors 480 x 854 px (4.00") 242 ppi | |
| Type | IPS LCD | |
| Display protection | yes | |
| Size | 6.2" inc | |
| Resolution | 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 | 271 PPI | |
| Colors | 16M | |
| Connectivity | BLU Advance A4 2019 | Oppo A3s |
| NFC | yes | |
| WiFi | yes v802.11 b/g/n | |
| Hotspot WiFi | yes | |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | |
| DLNA | yes | |
| 3G Network | HSDPA 850 / 900 / 2100 | |
| IrDA | yes | |
| 4G Network | LTE | |
| WAP | yes v2.0 | |
| 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 v4.0 | 4.2, A2DP, LE |
| Edge | yes | Yes |
| GPRS | yes | Yes |
| GPS | yes | Yes, with A-GPS |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps | |
| USB | yes | microUSB 2.0, USB On-The-Go |
| Camera | BLU Advance A4 2019 | Oppo A3s |
| Flash | yes LED | |
| Digital zoom | yes | |
| Additional | FF | |
| Video formats | H.263, MPEG4 | |
| Main camera | 5 Mpx | 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 | 2 Mpx | 8 MP, Single |
| Multimedia | BLU Advance A4 2019 | Oppo A3s |
| 3.5 mm Jack | Yes | |
| Radio | yes | FM radio |
| Design | BLU Advance A4 2019 | Oppo A3s |
| Colors | Red, Dark Purple | |
| Dimensions | 156.2 x 75.6 x 8.2 mm | |
| Weight | 168 g | |
| Battery | BLU Advance A4 2019 | Oppo A3s |
| Capacity | Li-Ion 1400 mAh | |
| Quick battery charging | yes | |
| Wireless battery charging | yes | |
| Battery capacity | 4230 mAh, Non-removable Li-Ion | |
| Other | BLU Advance A4 2019 | Oppo A3s |
| Accelerometer | yes | |
| Altimeter | yes | |
| Barometer | yes | |
| Fingerprint scanner | yes | |
| Gravity | yes | |
| Gyroscope | yes | |
| Hall-effect | yes | |
| Release date | 2018, July | |
| Hygrometer | yes | |
| Sensors | Accelerometer, proximity, compass | |
| Iris scanner | yes | |
| Magnetometer | yes | |
| Thermometer | yes |
