iPhone Screenshots


JamTimer is an app designed for the exciting sport of roller derby. Created for the jam-timer position, JamTimer replaces the need for using stopwatches. It has built-in configurations for WTFDA, RDCL, or OSDA style games, and can be customized for any type of scrimmage or tournament scenario.

- Keep track of all timing related tasks needed in a roller derby game.
- Built-in support for WFTDA, RDCL, and OSDA game configurations.
- Add custom game configurations (scrimmage or tournaments).
- Large buttons, conveniently operated with one hand.
- Vibrate warnings for specific events.

What's New

Version 4.1

• Updated for iOS 11 and the iPhone X.

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Ratings and Reviews

Add to Apple Watch?


I love this app, makes jam timing so easy! Any chance it will make it onto Apple Watch?

The best!

Ma Guns

I love this app! So much better then having to fumble with 2 stop watches.

Jam Timer


I am no longer juggling stop watches, praying I will push the right button in the right order. This app made easy work of my job. I highly recommend this app for anyone who has the pleasure of jam timing. It is the best app I ever bought. Thank you!!!!


Fearless Code
1.5 MB
Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Danish, Dutch, Finnish, French, German, Italian, Japanese, Portuguese, Spanish, Swedish
Age Rating
Rated 4+
© 2017, Fearless Code


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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