The best alternatives to Stems are Acapella Extractor, Melody ML, and Spleeter. If these 3 options don't work for you, we've listed a few more alternatives below.
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www.acapella-extractor.com is a free / no registration online service that will isolate vocals from any song you upload. It uses state of the art AI; results at pair or better than time consuming DIY methods and pay services. Also visit www.remove-vocals.com.
Simply upload any song, get the audio tracks isolated via machine learning, and either download them on the site or enter your email to recieve them in your inbox. Built with Deezer's Spleeter. 🤖💌
Deezer just open-sourced Spleeter, an audio separation library built on Python and TensorFlow that uses machine learning to quickly and freely isolate vocals in any song.
Transcribe+ helps you learn music by ear. The latest update uses machine learning to remove or isolate vocals, drums, bass and instrumentals from ANY song. Version 1.5 also includes, 8 new themes, video support, redesigned loop mode.