NinjaTube

NinjaTube is an app that lets you watch YouTube videos directly on your Apple Watch.
It provides both iOS and watchOS apps for a seamless experience.

[watchOS App]
･Play YouTube videos sent from the iOS app
･Standalone video selection and search on watchOS is not supported

[iOS App]
･Send YouTube videos to the watchOS app (iPhone app only)
･Watch YouTube videos directly on your iPhone with the built-in browser
･Picture-in-Picture (PiP) playback supported
･Background playback supported
･Desktop site display available in video playback mode
･Browse websites other than YouTube from the address bar
･Bookmark feature
･Dark mode support