BlackSquelchTHE OPEN RADIO TERMINAL

YOUR STATION, ANYWHERE

A little signal.
A real connection.

Local processing · no server

On the air

Loading modem

A quiet frequency. For now.

Start audio to listen. Your next connection
could be just a message away.

MFSK8 / MFSK16 · FEC · AUTO RECEIVE
Starting WebAssembly…

Send a message

0 / 512

Text or any file up to 1 MiB. Enter prepares; nothing transmits until you confirm.

Received files

Verified files will appear here.
Only complete files can be downloaded.

MAKE YOURSELF HEARD

Station settings

Exactly six letters or digits.

Device names appear after microphone permission. Unsupported output selection uses your system speaker.

Reception detects both profiles automatically. Keep this app visible while using radio audio. Headphones or a radio interface prevent acoustic feedback.

LESS TYPING. MORE TALKING.

Message macros

Use the buttons below, or Ctrl+X then 1–9. Macros insert text; they never transmit automatically. Leave a slot empty to disable it.

EVERYTHING AT HAND

All actions

Keyboard: Ctrl+X, release, then the action key. Esc cancels. Up/Down recalls sent messages.

Install BlackSquelch

Use your browser’s Install app or Add to Home Screen command. Installation is supported by current Chromium browsers and Safari on iPhone and iPad; other browsers may not offer it.

The app stays on your device and opens offline after its first complete load. Microphone permission is still required for radio audio.