OpenStudio

Your voice. Your frequency. No permission required.

Try the Live Demo · Report Bug · Sponsor

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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.

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Quick Start

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

One command. One process. One port.

Why OpenStudio?

	OpenStudio	Riverside	Zencastr	StreamYard
Price	Free / self-host	$29/mo	$20/mo	$25/mo
Recording	Per-track WAV + mix	Per-track	Per-track	Mix only
Self-hosted	Yes	No	No	No
Privacy	Zero tracking	Cloud-dependent	Cloud-dependent	Cloud-dependent
Max participants	15 (mesh)	8	15	10
Setup time	30 seconds	Account + payment	Account + payment	Account + payment
Open source	MIT	No	No	No

How It Works

┌─────────┐    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.

Features

• 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
• 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, no framework, no build step
• Safari compatible — WebSocket streaming fallback

Try It

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.

Architecture

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

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

Roadmap

• 0.1 — Core studio: WebRTC mesh, mix-minus, mute controls, Icecast streaming
• 0.2 — Single-server deploy, multi-track recording, live demo
• 0.3 — DHT station discovery, Nostr NIP-53 integration
• 0.4 — SFU for larger rooms (25+ participants)

Development

# 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.

Contributing

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

Sponsor

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.

License

MIT — use it however you want.

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talk hard.