# Jam Timer - Roller Derby Timer — Pro Roller Derby Timer

> Professional roller derby jam timer app with offline functionality. (iPhone/iPad app by Worthy Infotech Limited.)

- Source: https://appshunter.io/ios/app/jam-timer-roller-derby-timer/id6747149650 (this page in markdown: same URL + `.md`)
- Developer: [Worthy Infotech Limited](https://appshunter.io/developer/1627865311)
- Category: Sports, Games, Racing, Sports
- Price: $3.99
- Rating: 1.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 15.6 · 19 MB
- Languages: American English
- Released: 2025-06-11
- Data updated: 2026-06-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/jam-timer-roller-derby-timer/id6747149650/reviews.md

## What is Jam Timer?

RollTimer: The Professional Jam Timer for Roller Derby Officials
Designed specifically for the jam-timer position, RollTimer eliminates the need for traditional stopwatches and provides precise timing control for all roller derby formats. Whether you're officiating WFTDA sanctioned bouts, RDCL tournaments, or OSDA games, RollTimer has the configuration you need.

Key Features:
Built-in Game Configurations
WFTDA standard timing rules
RDCL tournament settings
OSDA game format
Custom configurations for scrimmages and special events

Professional Timing Control
Precise jam timing with lead jammer call-off
Period clock management
Lineup time tracking
Team and official timeout timers
Automatic vibration warnings at configurable intervals

Designed for Officials
Large buttons for one-handed operation
Clear, high-contrast display visible from across the track
Haptic feedback for critical timing events
Works completely offline - no internet required

Game Management
Track team scores and timeouts
Monitor official reviews remaining
Complete game history and statistics
Export game data for league records

Perfect for:
NSO jam timers at sanctioned bouts
Tournament directors managing multiple games
League officials during practice scrimmages
Coaches timing drills and scenarios
Referees needing backup timing

Why Choose RollTimer:
Unlike generic stopwatch apps, RollTimer understands roller derby. Every feature is built around the specific needs of derby timing, from the 30-second lineup to the 2-minute jam clock. The large, accessible interface ensures you can focus on the game, not fumbling with tiny buttons.
Trusted by officials across leagues worldwide, RollTimer brings professional-grade timing to your mobile device. Download now and experience the difference purpose-built software makes.

Offline Operation:
RollTimer works completely offline with no network requirements, perfect for venues with poor connectivity. All game data is stored locally on your device for maximum reliability.

## Key features

- Built-in game configurations
- Professional timing control
- Designed for officials
- Game management features
- Offline operation


## Frequently asked questions about Jam Timer

### What is Jam Timer used for?

Jam Timer is a professional application designed specifically for roller derby officials to manage jam timing, period clocks, lineup times, and timeouts with precision. It offers configurations for various roller derby formats and leagues.

### Does Jam Timer work offline?

Yes, Jam Timer works completely offline, meaning no internet connection is required for its operation. This makes it ideal for use in venues with poor connectivity, ensuring reliable timing for all events.

### What roller derby formats does Jam Timer support?

Jam Timer includes built-in game configurations for WFTDA standard timing rules, RDCL tournament settings, and OSDA game formats. It also allows for custom configurations for scrimmages and special events.

### How is Jam Timer designed for officials?

The app features large buttons for easy one-handed operation, a clear high-contrast display visible from a distance, and haptic feedback for critical timing events. This design ensures officials can focus on the game without struggling with the interface.

### Can I export game data with Jam Timer?

Yes, Jam Timer allows you to track team scores, timeouts, and official reviews, and offers the ability to export complete game history and statistics for league records.

### What is the price of Jam Timer?

Jam Timer is available for a one-time purchase of $3.99. This price grants you access to all its professional timing features without any recurring subscription fees.

### How frequently is Jam Timer updated?

The latest version of Jam Timer is 1.0.0, and it was last updated on June 12, 2025. Updates typically focus on improving functionality and ensuring compatibility with the latest device operating systems.

### What devices is Jam Timer compatible with?

Jam Timer is compatible with iPhone, iPad, and iPod devices. It is designed to provide a seamless experience across Apple's mobile ecosystem.

## Version history (last 1 release)

### 1.0.0 — 2025-06-12

No release notes.

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All apps by Worthy Infotech Limited: https://appshunter.io/developer/1627865311

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*