DownTube is an app for iOS that allows you to watch YouTube videos in an uncluttered and ad-free environment.
It allows you to create playlists that will play continuously in the background.
It has some other nice features:
- Add songs to favorites – always have favorites tracks by your hand
- Playlists support – make dance, workout, travel/car, party playlists
Developer note says “this application goes against YouTube’s Terms Of Service and therefore should only be used for educational purposes”.