| Hardware and OS | Oppo K9s | vivo Y11 |
| Operating system | Android 11, ColorOS 11.3 | Android 4.4.4 (KitKat) |
| Processor | Octa-core (4x2.4 GHz Kryo 670, 4x1.9 GHz Kryo 670) | Quad-core 1.3 GHz Cortex-A7 |
| Chipset | | Mediatek MT6582М |
| GPU | Adreno 642L | Mali-400MP2 |
| RAM | 6 GB, 8 GB | |
| Internal memory | | 4 GB, 512 MB RAM |
| Internal Storage | 128 GB, 256 GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | No | |
| User Interface | Yes | |
| Display | Oppo K9s | vivo Y11 |
| Type | IPS LCD | IPS LCD |
| Size | 6.59 inches | 4" inc |
| Resolution | 1080 x 2412 pixels | 480 x 800 px |
| Touchscreen | Yes | capacitive touchscreen |
| Screen-to-Body Ratio | | 59.2% |
| Display area | | 45.5 cm2 |
| Display aspect ratio | | 5:3 (height:width) |
| Pixel Density | ~ 401 ppi | 233 PPI |
| Features | 120Hz | |
| Colors | 16M Colors | 16M |
| Connectivity | Oppo K9s | vivo Y11 |
| 4G Network | 1, 2, 3, 4, 5, 7, 8, 28, 34, 38, 39, 40, 41 | |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 5G Network | 1, 28, 41, 77, 78 SA/NSA | |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| Network | | GSM / HSPA |
| SIM card | | Dual SIM (Micro-SIM, dual stand-by) |
| NFC | Unspecified | |
| Bluetooth | | 4.0, A2DP, EDR |
| Edge | | Yes |
| GPRS | | Yes |
| SIM | Nano SIM | |
| GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS, QZSS | Yes, with A-GPS |
| Dual SIM | Dual SIM (Nano-SIM, dual stand-by) | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A, 5G | HSPA 21.1/7.2 Mbps |
| Wireless Charging | No | |
| USB | USB Type-C 2.0, USB On-The-Go | microUSB 2.0, USB Host |
| Camera | Oppo K9s | vivo Y11 |
| Main camera | 64 MP (wide), 8 MP (macro), 2 MP (depth) | 5 MP, Single |
| Specs | | 5 MP, AF |
| Image | 2160p | |
| Features | LED flash, HDR, panorama | LED flash |
| Video | | 1080p@30fps |
| Selfie camera | 16 MP (wide) | 2 MP, Single |
| Multimedia | Oppo K9s | vivo Y11 |
| Loudspeaker | Yes | |
| Handsfree | Yes | |
| 3.5 mm Jack | Yes | Yes |
| Video Playback | Yes | |
| Radio | No | FM radio |
| Video Out | Yes | |
| Ring Tones | Yes | |
| Design | Oppo K9s | vivo Y11 |
| Colors | | White, Black |
| Dimensions | 8.5 mm thickness | 123 x 62.5 x 8.8 mm |
| Weight | 199 Grams | 124 g |
| Waterproof | No | |
| Battery | Oppo K9s | vivo Y11 |
| Battery capacity | | 1700 mAh, Removable Li-Po |
| Battery life | | Talking time- Up to 11 h (2G) / Up to 8 h (3G)
Music play - Up to 34 h |
| Capacity | Li-Po 4500 mAh, Fast charging 30W | |
| Placement | Non-Removable | |
| Other | Oppo K9s | vivo Y11 |
| Release date | | 2014, Q4 |
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass, | Accelerometer, proximity , Infrared port |
