My friend uses Apple Music and I use Spotify, and we got tired of manually keeping the same playlists synced, so I built Syncopate :) Everyone can keep editing their own playlist normally, and Syncopate figures out what changed, finds the matching songs on the other platform, and syncs everything automatically. The backend ended up being the most fun part to build. It keeps track of how each playlist changes over time, handles the weird differences between Spotify and Apple Music, and has safeguards so API issues or a bad sync don't mess up someone's playlist. There was a surprising amount hiding behind what is basically just "my friend added a song, now I have it too." It's live now and something my friends and I actually use, so I made a little video showing how it works! Would love to hear what you guys think!   submitted by   /u/nehagur [link]   [comments]