Hollerwave

Talk to people near you when there is no internet. Phones connect directly over Bluetooth — on a plane, at a festival, on a mountain trail.

What it does

A ripple map of who is within reach right now: close, medium or far
Text, hold-to-talk voice and photos, with honest sending / delivered / read states
Walkie-talkie rooms you join with an 8-character code
Messages hop through up to 3 friends' phones; messages wait and send when you meet again
End-to-end encryption, safety numbers, disappearing messages, on-device block and report
No account, no phone number, no servers, no ads — the app has no internet permission at all

Turn on airplane mode, then switch Bluetooth back on. Use it only when the crew says Bluetooth is allowed.

TanzSoft · Seoul, Republic of Korea