8-channel mixer
CD, tape, jingle, and microphone channels with faders, cue, level meters, and live monitoring — like a real studio desk.
Broadcast automation in the browser
Open source
Your complete radio studio — fully automated with AI content.
Castaro Web Studio is free, open-source software that combines a professional 8-channel mixer, media library, broadcast clocks, and AI-powered content in one interface. Drag & drop, smooth crossfades, top-of-hour transitions, and real-time automation — without heavy desktop software.
Open source — inspect the code, self-host, and adapt it to your station. Runs on XAMPP/Apache + PHP + MySQL on Windows.
Everything a modern station needs
From the first jingle drop to hour-accurate program clocks — Castaro covers manual and automated workflows.
Broadcast clocks
Plan program clocks minute by minute, configure TOTP transitions, and sync automation to wall-clock time with one click.
AI content & TTS
Generate news blocks, voice them, and drop them straight into your show. Major external suppliers are supported.
Media library
Music, jingles, beds, news, and ad-hoc files — searchable and draggable onto any channel.
Crossfade & audio scan
Smart transitions, category lockouts, and automatic fade curves for a professional sound.
MixerAPI
Program mix as a stream for external tools — ideal for the Castaro RadioSound extension and other integrations.
Inside the studio
Dark pro design, clear channel layout, and a dedicated area for automation and configuration.
Castaro RadioSound extension
For professional broadcasting, Castaro Web Studio delivers the finished
program mix via the MixerAPI.getMasterMixStream() interface.
The Castaro RadioSound extension picks up this stream and routes it
to your external output — e.g. encoder, streaming software, or hardware monitor.
- Microphone mix-minus in General Settings (recommended with RadioSound)
- Mute the browser monitor and listen only via RadioSound
- No feedback loop between local monitoring and program output
Ready to broadcast?
Castaro Web Studio is open-source software — download, fork, and host it yourself. Source code and releases will be available at https://github.com/TBD/castaro-web-studio.