| Hardware and OS | Vivo Y55 | Oppo A3s |
| Operating system | Android 6.0 | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | | Octa-core 1.8 GHz Cortex-A53 |
| RAM | 2GB | |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| Internal Storage | 16GB, TF card up to 128GB (not included) | |
| GPU | | Adreno 506 |
| Memory Card Slot | Dual SIM,Dual Standby | |
| Internal memory | | 16 GB, 2 GB RAM |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Display | Vivo Y55 | Oppo A3s |
| Type | IPS capacitive touch screen | IPS LCD |
| Size | 5.2 inch | 6.2" inc |
| Resolution | 1280 x 720 (HD 720) | 720 x 1520 px |
| Touchscreen | Yes | capacitive touchscreen |
| Features | Capacitive touch screen | |
| Screen-to-Body Ratio | | 81.2% |
| Display area | | 95.9 cm2 |
| Display aspect ratio | | 19:9 (height:width) |
| Pixel Density | 282PPI | 271 PPI |
| Colors | | 16M |
| Connectivity | Vivo Y55 | Oppo A3s |
| NFC | No | |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| SIM | Micro SIM | |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| Dual SIM | One micro sim, one nano sim | |
| 4G Network | | LTE |
| Wireless Charging | Yes | |
| Wi-Fi | 802.11a/b/g/n/ac wireless internet | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | | 4.2, A2DP, LE |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | GPS | Yes, with A-GPS |
| Speed | 150Mpbs | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | Micro USB V2.0 | microUSB 2.0, USB On-The-Go |
| Camera | Vivo Y55 | Oppo A3s |
| Main camera | 8.0MP | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | Yes | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | 5.0MP | 8 MP, Single |
| Multimedia | Vivo Y55 | Oppo A3s |
| Loudspeaker | Yes | |
| Video Playback | 3GP/MP4 | |
| Video Out | 3GP/MP4 | |
| Ring Tones | MP3 | |
| 3.5 mm Jack | yes | Yes |
| Radio | Yes | FM radio |
| Design | Vivo Y55 | Oppo A3s |
| Colors | | Red, Dark Purple |
| Dimensions | 147.9x72.9x7.5mm | 156.2 x 75.6 x 8.2 mm |
| Weight | 142g | 168 g |
| Battery | Vivo Y55 | Oppo A3s |
| Placement | Non-removable | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | Vivo Y55 | Oppo A3s |
| Release date | | 2018, July |
| Sensors | Gravity sensor | Accelerometer, proximity, compass |
