Invert Colors
A full systemwide Dark Mode is coming in iOS 13, likely to be announced in June and released later this year. If you’d rather not wait, there’s a feature buried in the Accessibility menu that can create a dark mode-like experience — right now.
Smart Invert will swap the color palette on most apps, giving you a darker background with lighter text in Facebook, Messages or basically any other app. On the other hand, it’s not systemwide — so some native menus and the Home screen will remain essentially unchanged.