The best alternatives to Never Ending Playlist are Muru Music, Tempo: Playlists for Spotify, and Ivy. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Do you ever have an awesome idea for a killer playlist, like you definitely know you want it to start with some indie pop, and finish with some bop electro, and have some slow folk somewhere but can't figure out the rest? - Well, Tempo can!
Ivy helps you share and discover music with the people in your life. Create and join leagues where players submit a song during the week, and then vote for their favorite on the weekend. Weekly and aggregate playlists are automatically created for you.