Dokk OS is the same operating system used by the Dramatic Order of the Knights of Khorassan (DoKK) in Rainbow Six Siege. Much of your regular operating system appearance has been skinned over with DoKK detailing.

Great care has obviously been taken

Dokk OS must have started out as a regular version of an operating system that has been skinned over in the same way that Blackberry allows you to add themes to change the way your operating system looks. However, after the skinning, the developers clearly started enjoying themselves and adding features from the in-game operating system. For example, there is a function that allows you to set an alarm where your phone calls itself, and it may call other devices that are paired via BlueTooth.

Carefully crafted and cleverly implemented

Dokk OS was developed by fans who have carefully ensured that the Dokk OS doesn't interfere with your device in any way without asking permission. The app is more about visual accuracy than it is about changing your operating system. The BlueTooth connection implementation process is overly tricky, but the app is otherwise a great piece of work by people who obviously care about the Rainbow Six brand.