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StemForge
What it is
StemForge is a free, open-source audio workstation that runs locally in a browser on Linux, macOS, Windows, or self-hosted setups. Its connected tabs handle stem separation, MIDI extraction, audio generation, song composition, mixing, and export. Demucs and BS-Roformer can separate vocals, drums, bass, other, guitar, and piano, with spectral analysis recommending an engine and model. BasicPitch extracts MIDI from instrument stems, while faster-whisper and pitch tracking handle vocal melodies; Web MIDI can send results to hardware synthesizers. Stable Audio Open generates text-conditioned audio up to 600 seconds, with optional audio or MIDI conditioning. AceStep supports song generation, and RVC provides voice conversion with 14 built-in voices. Mix combines project outputs, and exports include WAV, FLAC, MP3, and OGG, individually or as a ZIP. Audio stays on the computer after model downloads.
For and against
For
- Open-source and free to use
- Runs locally in a browser
- Supports stem and MIDI workflows
- Exports WAV, FLAC, MP3, and OGG
- Audio remains on the user's computer
Against
- Requires Python 3.12, FFmpeg, and FluidSynth
- NVIDIA acceleration needs driver 580 or newer
- CPU-only operation is significantly slower
- AceStep models require about 20 GB
The verdict
StemForge links several audio-production workflows in one local workstation, with broad export support and hardware MIDI output. Setup and model requirements are substantial, especially for composition and GPU-assisted use.
Who it suits
StemForge suits creators wanting local browser-based separation, MIDI, generation, composition, and mixing. It is also relevant to users with compatible hardware who can install the documented dependencies.
Plans and prices
Local StemForge
self-hosted · no subscription · no per-track fees · model downloads required
Read 15 Oct 2026 · github.com
StemForge
Open-source; runs locally on your hardware
Read 4 Oct 2026 · github.com
On the record
- AMD support
- Linux AMD GPUs use a separate ROCm 7.1 project variant, but the project describes end-to-end AMD hardware support as untested.github.com · read 15 Oct 2026
- Audio generation
- Stable Audio Open is used for text-conditioned stereo generation with optional stem, MIDI, and mix conditioning and project support up to 600 seconds through chunking.github.com · read 15 Oct 2026
- Basic Pitch integration
- Spotify describes Basic Pitch as an audio-to-MIDI converter with pitch-bend detection and publishes it under Apache-2.0.github.com · read 15 Oct 2026
- Documentation
- The repository links an INSTRUCTIONS.md guide, requirements, installation steps, launcher flags, model-cache guidance, and a third-party notices file.github.com · read 15 Oct 2026
- Export formats
- Export supports WAV, FLAC, MP3, and OGG, including ZIP downloads.github.com · read 15 Oct 2026
- Hugging Face gate
- The Synth tab requires accepting Stable Audio Open's license and logging in locally with a read token before model access.github.com · read 15 Oct 2026
- Install
- Installation uses a recursive Git clone, uv sync, and uv run python run.py, then serves the interface at localhost port 8765.github.com · read 15 Oct 2026
- Integrations
- The documented workflow connects Separate, MIDI, Synth, Compose, Mix, and Export tabs so outputs can flow between pipelines; MIDI Out connects to hardware synths via the browser's Web MIDI API.github.com · read 4 Oct 2026
- Licence
- The repository identifies StemForge itself as Apache License 2.0 and permits commercial use, modification, and distribution.github.com · read 15 Oct 2026
- Limit: Demucs artifacts
- Demucs documentation reports substantial bleeding and artifacts for the piano source in its experimental six-source model.github.com · read 15 Oct 2026
- Limit: Demucs maintenance
- The Demucs repository is archived and says its original maintainer no longer actively maintains it beyond important fixes.github.com · read 15 Oct 2026
- Limit: licence inconsistency
- The v1.0.0 release page instead describes that release as personal and non-commercial under PolyForm Noncommercial 1.0.0, creating a material licence discrepancy.github.com · read 15 Oct 2026
- Limit: Stable Audio language and style
- The model card says performance is weaker outside English, varies across musical styles and cultures, and is generally better for sound effects and field recordings than music.huggingface.co · read 15 Oct 2026
- Limit: Stable Audio vocals
- Stability's model card says Stable Audio Open is not able to generate realistic vocals.huggingface.co · read 15 Oct 2026
- Limit: third-party rights
- The project warns that its Apache licence does not cover third-party model weights and lists some weights as non-commercial, unknown-licence, or requiring separate review.github.com · read 15 Oct 2026
- Local processing
- The project says audio remains on the user's computer and that internet access is unnecessary after model downloads.github.com · read 15 Oct 2026
- macOS support
- Apple Silicon Macs use MPS acceleration, while Intel Macs operate CPU-only.github.com · read 15 Oct 2026
- Maker identity
- The repository owner identifies as Todd (tsondo) and lists Germany as the location.github.com · read 15 Oct 2026
