| Hardware and OS | TP-LINK Neffos C9s | Oppo A3s |
| Operating system | Android 9.0 P | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Quad-Core (4x Cortex A53 2.0 GHz) | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | MediaTek Helio A22 (MT6761) (12 nm) | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | IMG PowerVR GE-class GPU | Adreno 506 |
| Internal memory | | 16 GB, 2 GB RAM |
| External memory | microSDHC (dedicated slot) | microSD, up to 256 GB (dedicated slot) |
| Display | TP-LINK Neffos C9s | Oppo A3s |
| Type | LCD IPS | IPS LCD |
| Size | 5.71" inc | 6.2" inc |
| Resolution | 720 x 1520 px | 720 x 1520 px |
| Display colors | 16M | |
| Touchscreen | capacitive touchscreen | capacitive touchscreen |
| Screen area | cm2 | |
| Screen-to-Body Ratio | | 81.2% |
| Screen format | 19:9 (height:width) | |
| Display area | | 95.9 cm2 |
| Screen to body ratio | 75% | |
| Display aspect ratio | | 19:9 (height:width) |
| PPI /points per inch/ | 295 PPI | |
| Pixel Density | | 271 PPI |
| Colors | | 16M |
| Connectivity | TP-LINK Neffos C9s | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| NFC | No | |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| 4G Network | | LTE |
| Wi-Fi | 802.11a, 802.11b, 802.11g, 802.11n, 802.11n 5GHz, 802.11ac,Dual band ,Wi-Fi Hotspot ,Wi-Fi Direct | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | 2G / 3G / 4G | GSM / HSPA / LTE |
| SIM card | Dual SIM, Dual Standby (Nano SIM Nano SIM), | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | Bluetooth 5.0 | 4.2, A2DP, LE |
| Edge | Yes | Yes |
| GPRS | Yes | Yes |
| GPS | GPS, A-GPS, GLONASS, Galileo | 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 | TP-LINK Neffos C9s | Oppo A3s |
| Rear camera, main | 13 MP, Single | |
| Camera specs | 13 MP, ?/ 2.2, (Standard) | |
| Functions | LED Flash | |
| Main camera | | 13 MP, Dual |
| Front camera, selfie | 5 MP, Single | |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Specifications | 5 MP | |
| Features | | LED flash, HDR, panorama |
| Video | Yes | 1080p@30fps |
| Selfie camera | | 8 MP, Single |
| Multimedia | TP-LINK Neffos C9s | Oppo A3s |
| Headphone jack | Yes | |
| 3.5 mm Jack | | Yes |
| Radio | Yes | FM radio |
| Design | TP-LINK Neffos C9s | Oppo A3s |
| Dimensions (HxWxD) | 148.3 x72.3 x 8.9 mm | 5.84 x 2.85 x 0.35 in | |
| Body build | Plastic | |
| Colors | Blue, Red | Red, Dark Purple |
| Dimensions | | 156.2 x 75.6 x 8.2 mm |
| Weight | 150 g | 5.29 oz | 168 g |
| Other features | TP-LINK Neffos C9s | Oppo A3s |
| Sensors | Proximity, Light sensor, Accelerometer, compass,
Fast charging | |
| Battery | TP-LINK Neffos C9s | Oppo A3s |
| Battery | 3000 mAh, Li-Polymer | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | TP-LINK Neffos C9s | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
