The best alternatives to Sortlee are 22tracks 2.0, Playlist Machinery, and Gnarlist. If these 3 options don't work for you, we've listed a few more alternatives below.
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Gnarlist is a web app that allows you to create and manage collaborative Spotify playlists with rules. Stay in control at all times by setting genre, artist and more. Just log in with your Spotify account – of course it's free.