| Hardware and OS | Samsung Galaxy J7 Star | Oppo A3s |
| Operating system | Android 7.0 Nougat | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | 2x 2.2 GHz ARM Cortex-A73, 6x 1.6 GHz ARM Cortex-A53, Cores: 8 | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | ARM Mali-G71 | Adreno 506 |
| RAM | 2GB | |
| Internal memory | | 16 GB, 2 GB RAM |
| Internal Storage | 32GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | microSD, microSDHC, microSDXC | |
| User Interface | Yes | |
| Display | Samsung Galaxy J7 Star | Oppo A3s |
| Type | Super AMOLED | IPS LCD |
| Size | 5.5 inches | 6.2" inc |
| Resolution | 720 x 1280 pixels | 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 | 267 ppi | 271 PPI |
| Protection | 2.5D curved glass screen | |
| Colors | 16M Colors | 16M |
| Features | IGZO FHD Display, ~ 402 PPI Pixel Density, Capacitive, Multi-touch, Scratch Resistant, 2.5D Curved Glass Screen, 550 cd/m2, sRGB 135%, 1500:1 contrast ratio, Color LED Notifications, Frameless | |
| Connectivity | Samsung Galaxy J7 Star | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| 4G Network | Yes | LTE |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, 802.11 n 5GHz, Wi-Fi Direct, Wi-Fi Display, Wi-Fi Hotspot, Dual-Band | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| NFC | yes | |
| Network | | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | | 4.2, A2DP, LE |
| SIM | Nano SIM | |
| Edge | | Yes |
| Dual SIM | Hybrid Dual SIM (Nano-SIM, Nano-SIM/microSD), Dual Standby | |
| GPRS | | Yes |
| Wireless Charging | Yes | |
| GPS | Yes, with A-GPS, GLONASS, GPS | Yes, with A-GPS |
| Speed | LTE : 850 / 1800 / 900 / 2100 / 2600 MHz LTE : 1700 / 2100 MHz LTE : 700 MHz Class 17 LTE-TDD : 1900 MHz (Band 39) LTE-TDD : 2300 MHz (Band 40) LTE-TDD : 2500 MHz (Band 41) LTE-TDD : 2600 MHz (Band 38) LTE : 700 MHz (Band 28) LTE : 700 MHz (Band 12) | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | USB Type-C, 2.0 with OTG, Charging and Mass Storage Function | microUSB 2.0, USB On-The-Go |
| Camera | Samsung Galaxy J7 Star | Oppo A3s |
| Image | 4160 x 3120 pixels | |
| Main camera | 12.98 MP (megapixels) | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | LED | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | 7.99 MP (megapixels) | 8 MP, Single |
| Multimedia | Samsung Galaxy J7 Star | Oppo A3s |
| Loudspeaker | Yes | |
| Handsfree | Yes | |
| Video Playback | Yes Support 3GP, H.264, MKV, DivX, AVI, xVID, WMV, FLV, MP4, H.263 | |
| Video Out | Yes | |
| 3.5 mm Jack | yes | Yes |
| Ring Tones | Yes | |
| Radio | Yes | FM radio |
| Design | Samsung Galaxy J7 Star | Oppo A3s |
| Colors | | Red, Dark Purple |
| Dimensions | 76.2 x 153.2 x 8.6 mm | 156.2 x 75.6 x 8.2 mm |
| Waterproof | No | |
| Weight | 181 g | 168 g |
| Battery | Samsung Galaxy J7 Star | Oppo A3s |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Capacity | 3300 mAh, Li-Polymer | |
| Placement | Non-Removable | |
| Other | Samsung Galaxy J7 Star | Oppo A3s |
| Release date | | 2018, July |
| Sensors | Proximity, Light, Accelerometer, Fingerprint | Accelerometer, proximity, compass |
