| Hardware and OS | Oppo A9 | vivo Y11 |
| Operating system | Android 9.0 (Pie); ColorOS 6 | Android 4.4.4 (KitKat) |
| Processor | Octa-core (4x2.1 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53) | Quad-core 1.3 GHz Cortex-A7 |
| Chipset | Mediatek Helio P70 (12nm) | Mediatek MT6582М |
| GPU | Mali-G72 MP3 | Mali-400MP2 |
| Internal memory | 128 GB, 6 GB RAM | 4 GB, 512 MB RAM |
| External memory | microSD, up to 256 GB | microSD, up to 256 GB (dedicated slot) |
| Display | Oppo A9 | vivo Y11 |
| Type | IPS LCD | IPS LCD |
| Size | 6.53" inc | 4" inc |
| Resolution | 1080 x 2340 px | 480 x 800 px |
| Touchscreen | capacitive touchscreen | capacitive touchscreen |
| Screen-to-Body Ratio | 84.9% | 59.2% |
| Display area | 104.7 cm2 | 45.5 cm2 |
| Display aspect ratio | 19.5:9 (height:width) | 5:3 (height:width) |
| Pixel Density | 395 PPI | 233 PPI |
| Colors | 16M | 16M |
| Connectivity | Oppo A9 | vivo Y11 |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | |
| 4G Network | LTE | |
| Wi-Fi | Yes | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| Network | GSM / HSPA / LTE | GSM / HSPA |
| SIM card | Dual SIM (Nano-SIM, dual stand-by) | Dual SIM (Micro-SIM, dual stand-by) |
| Bluetooth | Yes | 4.0, A2DP, EDR |
| Edge | Yes | Yes |
| GPRS | Yes | Yes |
| GPS | Yes, with A-GPS, GLONASS, BDS | Yes, with A-GPS |
| NFC | Yes | |
| Speed | HSPA, LTE-A | HSPA 21.1/7.2 Mbps |
| USB | microUSB 2.0, USB On-The-Go | microUSB 2.0, USB Host |
| Camera | Oppo A9 | vivo Y11 |
| Main camera | 16 MP, Dual | 5 MP, Single |
| Specs | 16 MP, AF
-2 MP, f/2.4, depth sensor | 5 MP, AF |
| Features | Dual-LED dual-tone flash, panorama, HDR | LED flash |
| Video | 1080p@30fps | 1080p@30fps |
| Selfie camera | 16 MP, Single | 2 MP, Single |
| Multimedia | Oppo A9 | vivo Y11 |
| 3.5 mm Jack | Yes | Yes |
| Radio | FM radio | FM radio |
| Design | Oppo A9 | vivo Y11 |
| Colors | Mica Green, Ice Jade White, Fluorite Purple | White, Black |
| Dimensions | 162 x 76.1 x 8.3 mm | 123 x 62.5 x 8.8 mm |
| Weight | 190 g | 124 g |
| Battery | Oppo A9 | vivo Y11 |
| Battery life | | Talking time- Up to 11 h (2G) / Up to 8 h (3G)
Music play - Up to 34 h |
| Battery capacity | 4020 mAh, Non-removable Li-Po | 1700 mAh, Removable Li-Po |
| Other | Oppo A9 | vivo Y11 |
| Release date | 2019, April | 2014, Q4 |
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity, compass | Accelerometer, proximity , Infrared port |
