YouTube introduced Dark Theme for desktop, which turns the background dark while videos are being viewed on its site, last year. Now, the company officially began rolling out the feature for mobile devices — starting with its iOS app.
YouTube developed Dark Theme specifically to cut down on glare and allow users to take in the true colors of the videos they’re watching. It’s similar to Twitter’s Night Mode, which also switches the app and web interface to darker colors that are much easier on the eyes. It was introduced in 2016 for its mobile app before being offered on desktop as well.