Jamzo

Jamzo is an app created for roller derby non-skating officials (NSOs) to simplify the management of the 30-second penalty box timer. Three timer modes • Blocker Timer: track 30-second penalties for blockers. • Jammer Timer: manage jammer penalties with ease. • Dual Timer: combine both roles in one convenient screen. Specifically built for the penalty box • Timers that are easy to start and follow. • A clear, glanceable interface. • Reduces stress during games and scrimmages. Jamzo helps make penalty box management simple, reliable, and rule-compliant, so you can focus on what matters most: keeping the penalty box running smoothly without confusion.