| Hardware and OS vivo Y91 |
| Operating system: | Android 8.1 (Oreo); Funtouch 4.5 |
| Processor: | Octa-core (2x1.95 GHz Cortex-A53 & 6x1.45 GHz Cortex A53) |
| Chipset: | Qualcomm SDM439 Snapdragon 439 (12 nm) |
| GPU: | Adreno 505 |
| Internal memory: | 32 GB, 3 GB RAM
16 GB, 2 GB RAM |
| External memory: | microSD, up to 256 GB |
| Display vivo Y91 |
| Type: | IPS LCD |
| Size: | 6.22" inc |
| Resolution: | 720 x 1520 px |
| Touchscreen: | capacitive touchscreen |
| Screen-to-Body Ratio: | 82.9% |
| Display area: | 96.6 cm2 |
| Display aspect ratio: | 19:9 (height:width) |
| Pixel Density: | 270 PPI |
| Colors: | 16M |
| Connectivity vivo Y91 |
| 2G Network: | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network: | HSDPA 850 / 900 / 2100 |
| 4G Network: | LTE band 1(2100), 3(1800), 5(850), 40(2300), 41(2500) |
| Wi-Fi: | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network: | GSM / HSPA / LTE |
| SIM card: | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth: | 4.2, A2DP, LE |
| Edge: | Yes |
| GPRS: | Yes |
| GPS: | Yes, with A-GPS, GLONASS, BDS |
| Speed: | HSPA 42.2/5.76 Mbps, LTE Cat5 150/75 Mbps |
| USB: | microUSB 2.0, USB On-The-Go |
| Camera vivo Y91 |
| Main camera: | 13 MP,
Dual |
| Specs: | 13 MP, f/2.2, PDAF
-2 MP, f/2.4, depth sensor |
| Features: | LED flash, panorama |
| Video: | 1080p@30fps |
| Selfie camera: | 8 MP,
Single |
| Specs: | 8 MP, f/1.8 |
| Multimedia vivo Y91 |
| 3.5 mm Jack: | Yes |
| Radio: | FM radio |
| Design vivo Y91 |
| Colors: | Starry Black, Ocean Blue, Red (Y91i only) |
| Dimensions: | 155.1 x 75.1 x 8.3 mm |
| Weight: | 163.5 g |
| Battery vivo Y91 |
| Battery capacity: | 4030 mAh, Non-removable Li-Po |
| Other vivo Y91 |
| Release date: | 2018, November |
| Sensors: | Fingerprint (rear-mounted), accelerometer, proximity, compass |
