Vivo Y91 is powered by an octa-core MediaTek Helio P22 (MTK6762R) processor. It comes with 3GB of RAM.
The Vivo Y91 runs Android 8.1 and is powered by a 4,030mAh battery.
As far as the cameras are concerned, the Vivo Y91 on the rear packs a 13-megapixel primary camera with an f/f/2.2 aperture and a second 2-megapixel camera with an f/f/2.4 aperture. It sports a 8-megapixel camera on the front for selfies, with an f/f/1.8 aperture.
The Vivo Y91 runs Funtouch OS 4.5 based on Android 8.1 and packs 64GB of inbuilt storage that can be expanded via microSD card (up to 256GB) with a dedicated slot. The Vivo Y91 is a dual-SIM (GSM and GSM) smartphone that accepts Nano-SIM and Nano-SIM cards.
Connectivity options on the Vivo Y91 include Wi-Fi, Bluetooth v5.00, Micro-USB, 3G, and 4G (with support for Band 40 used by some LTE networks in India) with active 4G on both SIM cards. Sensors on the phone include accelerometer, ambient light sensor, compass/ magnetometer, gyroscope, proximity sensor, and fingerprint sensor. The Vivo Y91 supports face unlock.
The Vivo Y91 measures 155.11 x 75.09 x 8.28mm (height x width x thickness) and weighs 163.50 grams. It was launched in Starry Black and Ocean Blue colours.