🎉 NO WIFI · NO INTERNET · NO PAIRING · ANY PHONE

Sonic Broadcast

Light up every phone in the room and send them all the same message — with one sound. No network, no app codes, no accounts. Everyone just needs this page open and Join.

1 · Everyone in the room: Join the show

Tap Join, allow the mic, then wait for a broadcast.

2 · One person: Broadcast

✨ Flash
⚡ Strobe
🌊 Pulse
🌈 Rainbow
The only way to instantly light up & message a whole room of phones with zero setup and zero internet. Built on an acoustic modem (16-tone FSK, 5–8 kHz, CRC).
tap to dismiss

Website crafted by Everbuilt Studio