With macOS Mojave, Apple is bringing a dark-themed interface to your Mac. Although a similar mode is yet to make its way into iOS, a bunch of popular third-party applications now include either a pure black mode, like Twitter and YouTube, or at least offer a darkened appearance, like Outlook and Twitterrific, which uses shades of grey to generate panel contras.
Check out this Apple-curated list of iPhone apps that offer pure black mode
