Oppo A91 features a 6.4-inch AMOLED full HD+ display with 1080×2340 pixels resolution and 20:9 aspect ratio. It is powered by MediaTek Helio P70 chipset along with 8 GB of RAM. For enhanced gaming experience, the phone comes with Game Boost 2.0. It has 128 GB of internal storage and a microSD card slot for more storage. The phone is backed up by 4,025mAh battery coupled with VOOC 4.0 fast charging.
For the camera, the phone has a quad rear camera setup with 48-megapixel main lens, an 8-megapixel ultrawide lens with 119-degree field-of-view, a 2-megapixel macro lens and a 2-megapixel depth sensor It has a front camera of 16-megapixel. It runs on ColorOS 6.1 based Android 9 Pie. Connectivity features include dual-SIM support, 4G VoLTE, Wi-Fi 802.11ac, Bluetooth 5.0, GPS, USB-C and 3.5mm audio jack.