As mentioned earlier Vivo has tried their level best to mimic Apple iPhone X and same can be said about Vivo V9's software. It comes with Android 8.0 Oreo out of the box with Vivo's own custom FunTouch OS 4.0 on top. This is a heavily customized skin which tries extremely hard to look like iOS. Icons look similar to ones you see on Apple iPhones, notification slider is similar too, and you can also slide up a control center like settings page from the bottom of the screen, which again, is a classic iOS look.
If you've used a Vivo smartphone before, you will have an experience pretty similar and easy to navigate. Only difference you will see is positioning of network signal, clock, data/WiFi, and battery level indicators because of notch. There is no application launcher as Vivo likes to keep apps on main screen only and UI uses multiple home screens to house applications. Swiping down from top will reveal notifications drawer while swiping up from bottom brings out shortcut keys.
Inside Settings, users can change order and styles of navigation keys, or choose to use navigation gestures instead of keys giving them the option to navigate through UI similar to how it is done on Apple iPhone X. Vivo V9 has a picture-in-picture mode and one can go to settings to check which apps support it. There are some nice software enhancements like one-handed mode, app cloning and smart motion gestures. It is something we have also seen on Motorola and Huawei devices. For instance, if you just shake the device, flashlight can be turned on. Other features include a Game Mode for uninterrupted gaming, Smart motion for gesture-based controls, Smart Split for split screen or picture-in-picture mode, One-handed mode, App Clone, Smart click for quick app launches using volume keys, and Face Beauty for video calls.
Vivo V9 has Vivo's native apps like the V-Appstore, iTheme, iManager, EasyShare, and Vivo app to view company's own products. Google's apps are here as well, along with pre-installed apps like Lazada, Facebook, and WPS Office, which you can uninstall. To have an idea about amount of bloatware which is on this device, you're getting 49.40GB of usable space out of 64GB.
Even with a heavily bloated software experience, Vivo provides decent RAM management. Phone runs fairly smooth, with a few lags here and there. Most frustrating thing about this OS for me is that it undermines user experience of many third party-apps, and instead tries to add an Apple like vibe to everything. For security you get a Facial unlock with Vivo V9, which is not as secured as Apple's face id, but it works quite fast.
Overall, you get an experience with this phone which you might want to get from an Apple smartphone. If you're a stock Android fan, this phone is a definitely not for you, but if you want to enjoy the Apple experience at a lower price, you won't find many problems with Vivo's latest flagship.