Samsung's own user interface for Version 9 of the Android OS (Android Pie). Geared for the Galaxy S8 and Note 8 at minimum, One UI was released in beta at the end of 2018, requiring users to sign up via their Samsung accounts.
The look and feel has not dramatically changed from Version 8; however, there are differences. The icons are slightly changed, and the notifications and settings text are less squashed together. Instead of showing opened apps as a vertical tabbed list, the multitasking window in One UI displays the apps horizontally like the iPhone. Night mode flips the phone from a white to a black background, which can be switched on schedule. Optionally, swiping gestures replace the home, back and opened apps icons. Rather than the lock screen clock always on, it can display for 30 seconds with a tap. A scene optimizer automatically adjusts the colors in photos depending on chosen scene. See Android versions