cloudDSP

Free, open source stem separation for DJs. Upload tracks and get vocals, drums, bass and melody stems back, ready for your decks:

• CDJ-3000 with cdj3k-mods: stems written in the mod's native USB format, so they load on the deck itself.
• Everything else (CDJ-3000X, CDJ-2000 series, XDJ-XZ / AZ / RX3, Denon Engine DJ players, rekordbox, Serato, Traktor, any DAW): each stem as its own WAV, FLAC or MP3, plus an instrumental.

Separation runs on GPUs with Demucs. The site shows the separation live as it happens, lets you audition every stem in the browser and download single files or one zip.

Hosted at clouddsp.ca, or run your own copy.

Run it on your own computer

You need an NVIDIA GPU, Node.js 22+, uv and ffmpeg.

git clone https://github.com/KayTwenty/clouddsp.git
cd clouddsp
npm install
npm run selfhost

Open http://localhost:3000. That's the whole setup: the website and a GPU worker using your local GPU run together, files and jobs are stored on this machine and deleted after 48 hours. No cloud accounts, no configuration. The first run builds the site and downloads the right PyTorch build for your GPU (GTX 10-series through RTX 50-series are detected automatically).

Prefer containers? docker compose up -d --build does the same. See docs/self-hosting.md for Docker, running on a home server for other people, adding more GPUs and every setting.

Deploy publicly

The hosted version runs the website on Vercel with Prisma Postgres for the job queue and Cloudflare R2 for files, while GPU workers on home machines pull jobs over HTTPS. See docs/deploy-vercel.md.

How it works

Workers only make outgoing requests, so a GPU can sit anywhere: the same machine, a home server or a rented cloud GPU. Storage and the queue each have a zero-setup local mode and a scalable mode (any S3-compatible storage, Postgres). More in docs/architecture.md.

Project layout

Path	What's there
app/	Next.js pages, API routes and UI components
app/api/	Job, storage, status and worker endpoints
app/ui/	Uploader, device picker, live visualizer, stem player, 3D side panels
lib/	Device list, site settings and server code (job queue, storage)
prisma/	Database schema and migrations (Postgres mode)
worker/	Python GPU worker: separation, exports, live telemetry
scripts/selfhost.mjs	The one-command local launcher
docs/	Self-hosting, deployment and architecture guides

Development

npm install
npm run dev      # website on http://localhost:3000
npm run worker   # GPU worker, in a second terminal

npm run lint and npm run typecheck check the code. Contributions are welcome, see CONTRIBUTING.md.

License

cloudDSP is free software under the GNU AGPL v3. You can use, modify and self-host it. If you run a modified version as a public website, the license asks you to share your changes with its users; the footer's "Source code" link (NEXT_PUBLIC_SOURCE_URL) is there for that.

cloudDSP is an independent project and is not affiliated with or endorsed by AlphaTheta, Pioneer DJ, Denon DJ, inMusic or the developers of any firmware mod. It does not distribute firmware. Product names are used only to describe compatibility. Only process music you have the rights to use.