I have a lot of Spotify playlists and I wanted an Alfred like tool to quickly add songs to my Spotify playlists, mostly using my keyboard. There was none out there that I was happy with, so I built it myself.
Fast forward to today, I've added a few more features I wanted for myself - auto removal of songs I skip often, auto like of songs I listen 100% and a smart playlist feature that gathers new songs from playlists I select into one separate playlist, every Monday.