stemsplat

Mac-only stem splitter for Apple Silicon.
The best and easiest to use ap for stem splitting.

Quickstart

1. Download the latest .zip from the Releases page
2. Extract it
3. Open the .app

What It Does

• Runs fully locally on your Mac
• No cloud uploads
• Batch queue processing
• LAN/mobile access from other devices on your local network
• Multiple export formats
• Previous-files history so recent outputs are easy to reopen or reuse

Why This Exists

Most online stem splitters either suck or are behind paywalls, and UVR was a pain to do anything. I made Stemsplat to fill in the gaps UVR left.

email stemsplat@gmail.com for bugs/feature requests

Stems

• Vocals
• Instrumental
• Both (deux)
• Both (separate)
• Guitar
• Background vocals
• Full mix
• Full mix faster
• Drum split - 4
• Drum split - 6
• All stems
• Boost harmonies
• Denoise

Requirements

For the app

• Apple Silicon Mac (M-series)
• macOS
• Enough free disk space for models and exports (a couple gigs)
• Python 3.10+

Model Credits

Becruily

• Vocals
  https://huggingface.co/becruily/mel-band-roformer-vocals
• Instrumental
  https://huggingface.co/becruily/mel-band-roformer-instrumental
• Deux
  https://huggingface.co/becruily/mel-band-roformer-deux
• Guitar
  https://huggingface.co/becruily/mel-band-roformer-guitar
• Karaoke / Background vocals
  https://huggingface.co/becruily/mel-band-roformer-karaoke

Jarredou

• Denoise
  https://huggingface.co/jarredou/aufr33_MelBand_Denoise
• BS-Roformer 6-stem
  https://huggingface.co/jarredou/BS-ROFO-SW-Fixed
• DrumSep 6-stem
  https://github.com/jarredou/models/releases

Other bundled/downloadable sources

• Demucs drums / bass / other / 6-stem variants
• ZFTurbo DrumSep 4-stem

Future release plans (subject to change):

v0.5.0:

• Having an “edit” button that opens a popup card with a full-song waveform, in/out selection, and preview
• Mute/solo toggles for each selected stem inside that edit flow
• For a large upload all at once, keep it as one stack with a unified progress bar, then expand into individual cards on click and collapse back up
• Make the stop button a pause button, but only if it behaves like a real queue pause and not fake task resume
• Add estimated processing times to songs in queue and total estimated time for the queue
• Add user-created presets
• Export album covers with instrument pictures so splits are visually differentiated
• Custom right click
• When I right click a model and hit “remove from queue,” make the scroll animation cleaner/smoother
• Instead of “- vocals,” include the model name like “- vocals (single)” or “- vocals (full)”
• Settings/nerd stuff/device toggle (mps / cpu)
• Settings + quit + other stuff in the top toolbar
• Add uninstall
• Add delete models
• Right click models to uninstall one by one in model manager
• Add models resuming if partially downloaded and the network fails, if you feel good about the reliability work

v0.6.0:

• BPM/key detector
• BPM/key shifter
• De-reverb model
• Wind model
• Strings model
• Single-channel compute optimization
• In-app updates instead of redownloading from GitHub