Simple and easy-to-use referee tool app.
It can be used when refereeing soccer, rugby, handball, etc.

● Basic functions
1. Timer function
Tap the time to start the timer. If you want to stop it, tap it again. The timer can be set to “countdown” or “count up”. When "countdown" is selected, a sound can be played when the timer reaches zero.

2. Whistle
Press the "Short", "Long", or “Twice” button to sound the whistle.
If the whistle icon is held down, the whistle sound will play the entire time (up to approximately 30 seconds).

3. Penalty cards
Tap a card to display it in full screen.
In the initial display, "yellow card" and "red card" are shown, but other color cards can be displayed in the settings.