The code expires
A photograph of the screen stops working within about two minutes. If a match matters, lock the board with one tap, or set a PIN.
Put a screen behind the court. Scan the code on it with any phone. That phone is now the scoreboard.
No app to install. No account. Nothing to pay. A board you start now deletes itself in three days.
The screen shows the score. The phone changes it.
A photograph of the screen stops working within about two minutes. If a match matters, lock the board with one tap, or set a PIN.
A board that has lost contact says so rather than showing a confident number nobody is updating.
Nothing asks “are you sure” — there is no moment in a rally to read a dialog. Mistakes are simply reversible, even by the next person to hold the phone.
No cookies, no analytics, no accounts for scoring. A casual board and everything on it is deleted after three days.
An account is optional and only worth it if you run a hall: named courts that keep their settings, your colours on every board, all courts on one screen for the canteen, and results you can export.