StemRoller

What StemRoller is

StemRoller is a free desktop app for creating vocal, karaoke, and instrumental tracks from songs. Users search by song title, and the app finds songs online using YouTube search results. It separates tracks into vocals, drums, bass, and everything else, then combines the non-vocal stems into an instrumental mix. StemRoller uses Demucs, a machine-learning project, for the separation, and its maker describes the app as open source. The maker says it is totally free; the free plan costs nothing and provides four stem outputs and an instrumental track. Processing a song takes several minutes, and batch processing is not available. StemRoller is listed for macOS and Windows, with the homepage linking to a macOS ZIP and a Windows CUDA executable, version 3.1.1. Linux is not officially supported, though the README provides manual dependency setup instructions. The README offers the Unlicense or MIT No Attribution license. Users with questions or issues can ask for help on Discord.

Who it suits

StemRoller suits people who want to make vocal, karaoke, or instrumental tracks from individual songs on macOS or Windows. Linux users would need to follow manual dependency setup instructions, as Linux is not officially supported.

Limits

The Free plan costs nothing and provides four stem outputs plus an instrumental track. Splitting takes several minutes, and batch processing is unavailable.

Getting started

1. Open the StemRoller website.
2. Download the macOS ZIP or Windows CUDA executable from the homepage.
3. Install or run the app on macOS or Windows.
4. Search for a song by title and start splitting it into stems.

Verdict

StemRoller offers a free way to make four song stems and an instrumental mix. It is listed for macOS and Windows, with several minutes of processing per song and no batch processing.