Stamp moves tracks and playlists across various services - Apple Music, Spotify, Google Music and others!
Too many music services don’t make it easy to transport your playlists as it’s one of the methods they use to lock you into their service (and their recurring subscription fees). It looks like it supports .csv formats, but it would be nice if there were a better standardized data format to let users own all of their own data. How great would it be if I could maintain my own playlist on my own website and then authorize services to access it to play what I wanted? Then I could have one central repository and take it to any subscription service out there.
It looks like it supports Spotify, Apple Music, Google Music, Pandora (Pro only?), Amazon Music, Groove, YouTube, rdio, Deezer, and Tidal.