Jamzo
Sports
Only for iPhone
Free · Designed for iPhone
iPhone
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.
Ratings & Reviews
This app hasn’t received enough ratings or reviews to display an overview.
What’s new in version 1.1.0 :
• Added landscape mode support
• Introduced a blocker timer feature
• Added vibration alerts at 10 seconds and 0 seconds
• Bug fixes and performance improvements
The developer, Charles Robart, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Charles Robart
- Size
- 38.2 MB
- Category
- Sports
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- Languages
- English
- Age Rating
16+
- 16+
- Contains
Unrestricted Web Access
- Copyright
- © 2025 Jamzo