Roller Derby Penalty Timer is a mobile app created for roller derby officials. The app allows you to track and manage your entire penalty box and track any skater's activity during a WFTDA game. This allows you to take more informed decisions during a game. You can also track any configuration you'd like: two blockers, two jammers, four blockers, or even the full penalty box!

When you start a game, you'll be given a 10-second warning. If the skater doesn't get up within 10 seconds, you'll be given a penalty. You can track any skater's activity during a game and manage your entire penalty box from the app.