YouTube Todo by 4th Software

Youtube has a watch later playlist but because it has no structure, most people never actually view the videos that they send there. It is where videos go to die, most people's "watch later" have hundreds of unwatched videos. My app, Youtube Todo, combines watch later functionality with a todo list and automatically sorts and filters out and removes videos once you've watched them. Also, unlike using a regular playlist, it shows both the list and the video viewer on the same page so you don't have to go back and forth between them each time you watch one.