| Hardware and OS | Vivo Y91 3GB RAM | |
| Operating system | Android v8.1 (Oreo) | |
| Chipset | Qualcomm Snapdragon 439 | |
| Processor | Octa core (1.95 GHz, Quad core, Cortex A53 1.45 GHz, Quad core, Cortex A53) | |
| Graphics | Adreno 505 | |
| RAM | 3 GB | |
| Internal Storage | 32 GB | |
| Expandable memory | Yes Up to 256 GB | |
| Custom UI | Funtouch OS | |
| Display | Vivo Y91 3GB RAM | other phones |
| Type | IPS LCD | |
| Size | 6.22 inches | |
| Resolution | 720 x 1520 pixels | |
| Pixel Density | 270 ppi | |
| Touchscreen | Yes Capacitive Touchscreen, Multi-touch | |
| Aspect ratio | 19:9 | |
| Screen to body ratio calculated | 82.6 % | |
| Connectivity | Vivo Y91 3GB RAM | other phones |
| Network support | 4G , 3G, 2G | |
| WI-FI | Yes Wi-Fi 802.11, b/g/n | |
| Gps | Yes with A-GPS, Glonass | |
| Bluetooth | Yes v5.0 | |
| Dual SIM | Dual SIM, GSM GSM | |
| SIM size | SIM1: Nano, SIM2: Nano | |
| USB TYPE-C | No | |
| USB connectivity | Mass storage device, USB charging, microUSB 2.0 | |
| Camera | Vivo Y91 3GB RAM | other phones |
| Main camera | 13 MP 2 MP | |
| Image | 4128 x 3096 Pixels | |
| Front camera | 8 MP | |
| Camera features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
| Flash | Yes Screen flash | |
| Autofocus | Yes Phase Detection autofocus | |
| Aperture | F1.8 | |
| Video recording | 1920x1080 @ 30 fps | |
| Design | Vivo Y91 3GB RAM | other phones |
| Height | 155.1 mm | |
| Width | 75 mm | |
| Thickness | 8.2 mm | |
| Weight | 163.5 grams | |
| Colours | Ocean Blue, Starry Black | |
| Build material | Back: Plastic | |
| Battery | Vivo Y91 3GB RAM | other phones |
| Capacity | 4030 mAh | |
| Type | Li-ion | |
| User replaceable | No | |
| Other | Vivo Y91 3GB RAM | other phones |
| Fingerprint sensor | Yes | |
| Fingerprint sensor position | Rear | |
| Other sensors | Light sensor, Proximity sensor, Accelerometer, Compass, Gyroscope | |
