| Price | 212 USD |
| Brand | vivo |
| Model | vivo Y91 (Mediatek) |
| Status | Available. Released 2019, January |
| Release Date | 2019-01 |
| RAM | 3 GB RAM |
| STORAGE | 64 GB |
| Memory Slot | microSD, up to 256 GB |
| Rear Camera | 13 MP, 2 MP |
| Feature | panorama, LED flash |
| Video Recording | 1080p@30fps |
| Front Camera | 8 MP |
| Front Video Recording |
| Network | 2G/3G/4G |
| USB | microUSB 2.0, USB On-The-Go |
| GPS | Yes, with A-GPS, GLONASS, BDS |
| Bluetooth | 5.0, A2DP, LE |
| WLAN | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| SIM | Single SIM (Nano-SIM) or Dual SIM (Nano-SIM, dual stand-by) |
| EDGE | Yes |
| GPRS | Yes |
| Speed | HSPA 42.2/5.76 Mbps, LTE Cat5 150/75 Mbps |
| Type | Non-Removable Battery |
| Size | 4030 mAh, Li-Po Battery |
| Charging |
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity, compass |
| Type | IPS LCD capacitive touchscreen, 16M colors |
| Size | 6.22 inches, 720 x 1520 Pixel |
| Aspect Ratio | 19:9 |
| PPI | ~270 ppi density |
| Screen to Body Ratio | ~82.9% |
| Protection | |
| Build |
| OS | Android 8.1 Oreo Funtouch 4.5 |
| Chipsets | Mediatek MT6762 Helio P22 (12 nm) |
| GPU | PowerVR GE8320 |
| CPU | Octa-core 2.0 GHz Cortex-A53 |
| Colors | Starry Black, Ocean Blue |
| Weight | 163.5 g (5.78 oz) |
| Dimensions | 155.1 x 75.1 x 8.3 mm (6.11 x 2.96 x 0.33 in) |
| NFC | |
| 3.5mm Jack | Yes |
| Charging | |
| Water Proof |
| Radio | FM radio |
| Loudspeaker | Yes |