StemDeck, a free, open-source and local AI stem separator

StemDeck is a free, open-source stem separation tool that runs entirely on the user's own machine, positioning itself as an open alternative to cloud stem-splitters like Moises and LALAL.AI—no account, no quota, no uploads, no subscription. It emphasizes that it is a stem separator, not a downloader: its main job is processing audio the user already owns, and it does not store, cache, or redistribute any downloaded content. YouTube support is offered only as a convenience for content the user has the right to process, and everything happens locally so nothing leaves the machine.

It accepts MP3, WAV, FLAC, OGG/Opus, MP4, or M4A files, or a YouTube URL, and splits audio into up to six stems—vocals, drums, bass, guitar, piano, and other—using Demucs' htdemucs_6s model with auto-detection of the best Torch device (CUDA on NVIDIA, MPS on Apple Silicon, CPU fallback). The included DAW-style multitrack mixer lets users mute, solo, balance levels, zoom the waveform, loop a region, and export individual stems or a custom mix. The waveform editor features min/max sample rendering across all stems, shared normalization, zoom in/out/Fit, loop drag on the ruler, and a gold playhead overlay.

By keeping everything local and free, StemDeck serves users who want stems for personal study and prefer privacy and zero cost. The project accepts no money, sponsorship, or funding, and the listing recommends various musicians, gear makers, and communities purely as appreciation. For users who need the polish, a mobile app, or deeper musician tooling, the commercial products are noted as a better fit.