browser now · desktop next · iOS tonight

Stemacle

Split songs into stems, lock loops to tempo, shuffle compatible tracks, and export everything without uploading your music.

The web app is instant. The desktop app adds a private library, better local splitting, downloads, background jobs, and a CLI for people who would rather type than tap.

open web app download desktop view repo

web browser instrument

Drop a track and split it locally with tempo-locked loop controls.

desktop downloads and library

Mac, Windows, Linux, high-quality separation, export, and Stem Shuffle.

terminal CLI for hard mode

Run checks, plan Demucs splits, and export stems from shell scripts.

desktop app

Quiet power around the same physical control.

Stemacle Desktop keeps the circle, then adds the things a browser should not pretend to own: file dialogs, local state, background splitting, native exports, and release builds.

split: Preview stems are built in. High-quality mode plans and runs Demucs locally when installed.
shuffle: Analyze local tracks, rank compatible pairs by tempo and key, and move between Deck A and Deck B.
download: Export manifest-backed stem packs for use in other tools or future Stemacle sessions.
private: Files stay on your machine. No upload account sits between you and the track.

repo and releases

GitHub releases carry the desktop app and CLI.

Artifacts are built for Apple Silicon, Intel Mac, Windows, and Linux. The CLI is named `stemacle`.

latest release source

terminal stemacle

$ stemacle doctor
Stemacle CLI
Demucs: available
Preview splitter: available

$ stemacle split track.mp3 --out ./stems
./stems/manifest.json

$ stemacle split track.mp3 --out ./stems --dry-run

download targets

One repo, four surfaces.

The web app is live at `/app/`. Desktop installers and CLI artifacts are published from the Stemacle repo.

macOS universal Windows x64 Linux x64 CLI binaries

iOS

TestFlight is the next surface. The mobile build keeps the same local-first idea, with a smaller touch layout and the same Stemacle identity.