Is Ultimate Vocal Remover (UVR5) the best free stem separator?
UVR5 is the best free stem separator if you have a capable GPU and want to keep audio on your own machine, because it is a free, MIT-licensed front end for many open models, not one model. It is not automatically the most accurate: public leaderboards are now topped by newer band-split models, and the free web service MVSEP runs many of them for you.
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