Synchro Messenger

About

Synchro Messenger lets competition coordinators send real-time, full-screen overlay messages to Chromebooks and other Chrome browsers on a local network — purpose-built for artistic swimming meets.

HOW IT WORKS

One device runs as the sender (coordinator), while poolside devices run as receivers. Messages are relayed through a lightweight server on your local network — no internet connection required.

When a message arrives on a receiver device, it appears as a large, unmissable overlay covering the screen. The operator taps anywhere to dismiss it and get back to work.

FEATURES

• Full-screen dismissable overlay — impossible to miss during a busy competition
• Send to all receivers at once, or target a specific device
• Normal and urgent message priorities with distinct audio alerts
• Live device dashboard showing all connected devices, their status, IP, and platform
• Message activity log with one-tap resend
• Auto-reconnect if the network drops
• Works entirely on your local network — no cloud, no accounts, no internet needed

SETUP

Run the Synchro Messenger relay server on any machine on your network
Install this extension on all devices
Configure each device with the server address, a device name, and its role (sender or receiver)
Start messaging
The relay server is a lightweight standalone binary — download it from the project's GitHub repository. No Node.js installation required.

BUILT FOR COMPETITION DAY

Synchro Messenger is designed for the realities of running a swim meet: quick setup, no accounts to manage, no internet dependency, and messages that simply cannot be overlooked on a busy pool deck.