Introducing Chronoflag: one shared clock, no arguments
Chronoflag is a server-authoritative shared stopwatch for teams, events, and anyone who needs every screen to agree on the same second.
Today I’m launching Chronoflag: a shared stopwatch built for moments when several people need to act on the same clock.
The problem is not starting a timer
Starting a stopwatch is easy. Making a coach, an official, a crew member, and an audience look at the same elapsed time is the harder problem. Browser clocks drift, network latency exists, and a shared link should not automatically give everyone the power to stop or reset the session.
Chronoflag treats the server as the source of truth. The moment a command arrives, the server records it; every connected screen follows that authoritative timeline.
Open, start, share
There are no accounts and no ceremony. Open the app, create a session, and start a clock. Chronoflag gives you two different capability links: a private Control link for the people operating the timer, and an unlisted Live view for everyone who only needs to follow it.
That split is deliberate. A stage manager can share a live board with backstage screens without turning every screen into a control panel. A training session can put a coach and an athlete on one timeline without asking them to install anything. An amateur race can give officials a shared control surface and spectators a clean live view.
Built for real operations
Chronoflag supports multiple independent stopwatches and countdown timers, pause and resume, reset, laps, labels, focused clocks, real-time updates, and JSON or CSV exports. Commands are idempotent, so retries do not accidentally duplicate an action. Sessions stay active for 24 hours and remain readable for seven days.
It is intentionally not certified sports-timing equipment. The time of a manual action is the time the server receives it, which means network latency is part of the measurement. The goal is an honest, reliable shared clock for everyday live operations.
Try it
Chronoflag is live at chronoflag.com. If you need a small shared source of truth for time, open it, start a clock, and share the view.