| Hardware and OS | vivo U20 | Oppo A3s |
| Operating system | Android 9.0 (Pie), Funtouch 9.0 | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Octa-core (2x2.0 GHz Kryo 460 Gold, 6x1.7 GHz Kryo 460 Silver) | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Adreno 612 | Adreno 506 |
| RAM | 6 GB | |
| Internal memory | | 16 GB, 2 GB RAM |
| Internal Storage | 64 GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | microSD, up to 256 GB | |
| User Interface | Yes | |
| Display | vivo U20 | Oppo A3s |
| Type | IPS LCD capacitive touchscreen | IPS LCD |
| Size | 6.53 inches | 6.2" inc |
| Resolution | 1080 x 2340 pixels | 720 x 1520 px |
| Touchscreen | Capacitive touchscreen | capacitive touchscreen |
| Screen-to-Body Ratio | | 81.2% |
| Display area | | 95.9 cm2 |
| Display aspect ratio | | 19:9 (height:width) |
| Pixel Density | 395 ppi | 271 PPI |
| Colors | 16M | 16M |
| Connectivity | vivo U20 | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| NFC | No | |
| 4G Network | LTE band 1(2100), 3(1800), 5(850), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500) | LTE |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | | GSM / HSPA / LTE |
| SIM | Nano SIM | |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Dual SIM | Dual SIM (Nano-SIM, dual stand-by) | |
| Bluetooth | | 4.2, A2DP, LE |
| Wireless Charging | No | |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | Yes, with A-GPS, GLONASS, BDS | Yes, with A-GPS |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | microUSB 2.0, USB On-The-Go | microUSB 2.0, USB On-The-Go |
| Camera | vivo U20 | Oppo A3s |
| Image | 1080p | |
| Main camera | 16 MP (wide), 8 MP (ultrawide), 2 MP macro camera | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | LED flash, HDR, panorama | LED flash, HDR, panorama |
| Video | 2160p@30fps, 1080p@30fps | 1080p@30fps |
| Selfie camera | 16 MP | 8 MP, Single |
| Multimedia | vivo U20 | Oppo A3s |
| Loudspeaker | Yes | |
| Handsfree | Yes | |
| Video Playback | Yes | |
| Video Out | Yes | |
| Ring Tones | Yes | |
| 3.5 mm Jack | yes | Yes |
| Radio | Yes | FM radio |
| Design | vivo U20 | Oppo A3s |
| Colors | | Red, Dark Purple |
| Waterproof | No | |
| Dimensions | 162.2 x 76.5 x 8.9 mm | 156.2 x 75.6 x 8.2 mm |
| Weight | 193 grams | 168 g |
| Battery | vivo U20 | Oppo A3s |
| Capacity | Li-Po 5000 mAh battery, Battery charging 18W | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Placement | Non-removable | |
| Other | vivo U20 | Oppo A3s |
| Release date | | 2018, July |
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity, compass | Accelerometer, proximity, compass |
