A simple and native YouTube client for iOS with no ads, picture-in-picture, and background playback.
For picture-in-picture to work, toggle it while in fullscreen and then exit to home. After that, background playback will also work!
Limitations:
- Only embeddable video can play (most songs and copyrighted material are not available)
- The app requires an API key from the YouTube Data API. You can easily create one for free.