Recently references have been found to a Dark Mode (Dark Mode) on iOS 10, implying that Apple intends to release this function in the future on its mobile operating system.
On OS X / macOS, in General System Preferences, the option “Use dark menu bar and Dock” has been there for a while but the thing to put it off. The good news is that our reader Guilherme Rambo (@_inside) managed to activate a “more comprehensive” Dark Mode in several native apps on the system (such as Safari, System Preferences, Finder and Text Editor), and this already on OS X El Capitan.
Click / tap on the screenshots to enlarge them.
According to Guilherme, in one of the WWDC sessions this year (“Crafting Modern Cocoa Apps”) the presenter gave a lot of emphasis to developers using native controls in their apps. "This would make it easier to adapt to a Dark Mode, which can be easily applied with a property accessible to all developers," he says.
It is not yet a 100% polished look, but it is now undeniable that Apple is experimenting with such a possibility.