| Hardware and OS | Ark Elf S8 | Oppo A3s |
| Operating system | Android 6.0 Marshmallow OS | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Quad Core 1.3GHz ARM Cortex-A7 CPU Clock | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | ARM Mali-400 MP2, 2 Cores GPU | Adreno 506 |
| RAM | 1GB | |
| Internal memory | | 16 GB, 2 GB RAM |
| Internal Storage | 8GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | External Memory Supports Up to 64GB | |
| User Interface | Yes | |
| Display | Ark Elf S8 | Oppo A3s |
| Type | TFT capacitive touchscreen | IPS LCD |
| Size | 5.72-inches FWVGA | 6.2" inc |
| Resolution | 960 x 480 Pixels, 24 bit color depth | 720 x 1520 px |
| Touchscreen | Yes Multi-Touch Support | capacitive touchscreen |
| Screen-to-Body Ratio | | 81.2% |
| Display area | | 95.9 cm2 |
| Display aspect ratio | | 19:9 (height:width) |
| Protection | Yes Included | |
| Pixel Density | ~ 188 ppi | 271 PPI |
| Features | TFT, FWVGA display, ~188-PPI Pixel Density, Capacitive, Multitouch, 18:9 Aspect Ratio | |
| Colors | | 16M |
| Connectivity | Ark Elf S8 | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| 4G Network | Yes | LTE |
| NFC | No | |
| Wi-Fi | Wi-Fi 802.11 b/g/n, Wi-Fi Hotspot | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| SIM | Micro SIM | |
| Bluetooth | | 4.2, A2DP, LE |
| Dual SIM | Dual SIM (Micro-SIM, Micro-SIM) Dual Standby | |
| Edge | | Yes |
| Wireless Charging | No | |
| GPRS | | Yes |
| GPS | Yes, with GPS, A-GPS | Yes, with A-GPS |
| Speed | Not Available | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | Micro USB v2.0 with Charging and Mass Storage Function | microUSB 2.0, USB On-The-Go |
| Camera | Ark Elf S8 | Oppo A3s |
| Image | 3266 x 2449 Pixels | |
| Main camera | 8 Megapixels | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | Yes with Dual-LED Flash | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | 2 Megapixel | 8 MP, Single |
| Multimedia | Ark Elf S8 | Oppo A3s |
| Loudspeaker | Yes | |
| Handsfree | Yes | |
| Video Playback | Android 6.0 Marshmallow OS Yes Support AVI, MPEG-4, H.264, MKV, MP4, WMV | |
| Video Out | Yes With Wireless Media Link | |
| Ring Tones | Yes | |
| 3.5 mm Jack | yes | Yes |
| Radio | Yes | FM radio |
| Design | Ark Elf S8 | Oppo A3s |
| Colors | | Red, Dark Purple |
| Waterproof | No | |
| Dimensions | 151.7 mm x 72.3 mm x 9.4 mm | 156.2 x 75.6 x 8.2 mm |
| Weight | 157 g | 168 g |
| Battery | Ark Elf S8 | Oppo A3s |
| Capacity | 2,500mAh Lithium-ion | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Placement | Removable | |
| Other | Ark Elf S8 | Oppo A3s |
| Release date | | 2018, July |
| Sensors | Proximity, Light Sensor, Accelerometer | Accelerometer, proximity, compass |
