Your voice. Your frequency. No permission required.

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Somewhere right now, a community radio host is calculating whether they can afford another month of their streaming platform. A podcast collective just lost their entire archive because a service shut down. An independent voice got silenced — not by censorship, but by a credit card expiration.

OpenStudio exists because broadcasting should not require permission. No account creation. No monthly invoice. No terms of service between you and your audience. You clone a repo, you start broadcasting. Your station runs on your hardware. Your audio never touches a server you don't control.

This is a broadcast studio built the way radio was meant to work — direct, unmediated, yours. Vanilla JavaScript. Web Audio API. No framework, no build step, no dependency you didn't choose. Self-host it on a Raspberry Pi, a $5 VPS, a closet server at the back of your hackerspace. The entire client is under 50KB. If you can run Node, you can run a station — rent free.

Connect guests over WebRTC mesh. Mix-minus gives every participant broadcast-quality monitoring — the same technique used in professional studios, now running in a browser tab. Stream to unlimited listeners through Icecast. Record every voice on its own track for post-production. No platform stands between your signal and the world.

git clone https://github.com/msitarzewski/openstudio.git
cd openstudio && npm install && npm start
# Open http://localhost:6736

One command. One process. One port.

┌─────────┐    WebRTC Mesh    ┌─────────┐
│  Host   │◄────────────────►│ Caller  │
└────┬────┘                   └────┬────┘
     │          ┌─────────┐        │
     └──────────│Signaling│────────┘
                │ Server  │
                └────┬────┘
                     │
              ┌──────┴──────┐
              │ Web Audio   │
              │ Mix-Minus   │
              │ + Program   │
              └──────┬──────┘
                     │
              ┌──────┴──────┐
              │  Icecast    │
              │  Streaming  │
              └─────────────┘

Mix-minus is a broadcast engineering standard — each participant hears everyone except themselves. No echo, no feedback. Professional studios have done this with hardware for decades. OpenStudio does it in the browser with the Web Audio API.

• WebRTC mesh — peer-to-peer audio, no media server
• Mix-minus monitoring — broadcast-standard audio routing, in the browser
• Per-participant controls — individual gain, mute, live level meters
• Multi-track recording — per-voice WAV tracks + program mix for post-production
• On-device transcription — Whisper.cpp speech-to-text, no cloud API
• Audio cleaning pipeline — noise reduction, loudness normalization, filler/silence splice; Clean or Raw export
• Icecast streaming — broadcast to unlimited listeners, no audience cap
• Role-based access — host, engineer, caller with scoped permissions
• Zero dependencies — vanilla JS, Web Audio API, self-hosted fonts, no framework, no build step
• Safari compatible — WebSocket streaming fallback

1. Open openstudio.zerologic.com
2. Enter a station name and click Start Broadcast
3. Allow microphone access when prompted
4. Share the invite URL with a co-host (or open it in a second browser tab)
5. Talk — you'll hear each other with zero echo thanks to mix-minus
6. Hit Record to capture per-voice tracks, then Download when done

Broadcasts auto-expire after 15 minutes on the demo. Self-host for unlimited airtime.

For detailed architecture documentation, see docs/ARCHITECTURE-IMPLEMENTATION.md.

Stack: Node.js · WebSocket · WebRTC · Web Audio API · Icecast · coturn

• 0.1 — Core studio: WebRTC mesh, mix-minus, mute controls, Icecast streaming
• 0.2 — Single-server deploy, multi-track recording, live demo
• 0.2.1 — Security hardening: JWT room tokens, rate limiting, CORS, RBAC
• 0.3 — Power Move: Whisper.cpp transcription, audio cleaning pipeline, Clean/Raw export, self-hosted fonts
• 0.4 — DHT station discovery, Nostr NIP-53 integration, Ed25519 station identities
• 0.5 — SFU for larger rooms (25+ participants), soundboard, text chat

# Development mode with hot reload
npm run dev

# Run tests
npm test

# With Docker services (Icecast + coturn)
docker compose up -d
npm start

See docs/vision.md for the full project vision and philosophy.

PRs welcome! Please read the existing code before contributing — the codebase is intentionally minimal.

1. Fork the repo
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes
4. Push to the branch
5. Open a Pull Request

OpenStudio is free, open-source, and built by independent developers. If it's useful to you, sponsor the project on GitHub to keep it that way.

MIT — use it however you want.