The best alternatives to Duet are TwoShot, Ocean beta, and Super Looper. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Duet?
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TwoShot is the app we're empowering the next billion music producers with next-generation creation tools. While ensuring every artist involved during the process gets their fair share!
Ocean lifts the barriers that are often associated with electronic music-making & enable people to enjoy making music, exploring sounds and collaborating with people globally.
The app enables you to work with musicians around the world on multi-track music videos. One artist can start a song and then any other artist can edit it to add their own tracks. It's sort of a mashup between Smule and GitHub. Try it and see what you create.