Relay Builder is a individual race training and team tracking manager.

Relay Builder manages both predefined races from the library as well as allowing you to construct your own user defined races.

Once a race is defined and selected, Relay Builder records each participant's start time, finish time, duration and pace. The clock view also estimates the participants expected time to finish as well as the expected race finish time.

Additional views calculate and show group exchange expected duration and finish times.

Settings include user defined margin setting for ETA warning notifications, major van exchange message forwarding though messaging (iMessage or SMS) to the other vans, rating multipliers and map routing between major exchanges and arbitrary defined rest area locations.

The map view shows the relay exchange points and colored pins denote major exchanges, finished exchanges and future exchanges. The finished exchanges are annotated with the finish time.

Rating multipliers can be defined by the team to adjust each runner's pace estimates against the difficulty rating of the leg.

Data transfers can be between any number of devices.

Leg results can be automatically posted to Facebook, Twitter. SMS or sent via email during exchanges or postings may be sent manually for any team member's results. Results can also be transmitted to an AirPrinter.

If the app is connected over cellular or Wi-Fi. Using the Cloud, race progress for other teams logged in with an Apple ID can be tracked and other team members can sync race progress.

As a race observer you can track your or another team's progress by the app track function.

This app integrates with the Health app by reading the user profile data.

In training mode, a multi-week training schedule is created that can be used to prepare for the race. Training mode can capture workouts using GPS or log all the statistics for each of the workouts in the plan. Note: Continued use of GPS running in the background can dramatically decrease battery life.

Pre-defined races include

Fall Foliage Relay
HTC Washington
Wild Rogue Relay
Foliage Relay
Smokey. Mountain Relay
Spokane to SandPoint (Walk and Run)
Oregon Civil War Relay
Ragnar series
Ranger trail series
Route 66 Relay
Heartland 200 - Des Moines to Omaha
Wild Rogue Relay

Results can be emailed in plaintext or CSV format.

What’s New

Version 4.03.03

Added 2019 races
Bug fixes

Ratings and Reviews

Heidi Broberg ,

Awful! Don’t use!

I never even got to end up using it for our Ragnar race and this is after about 8 emails of tech support trying to help me. They could never update the race, it would erase data every time. And crash while using it. DONT DO IT! I’m trying to get my $2 back but we will see.

rbm55 ,

Works great

We used this for the 2014 Ragnar NWP race. Worked great. The ability to transfer from Van to Van via Bluetooth makes it more useful than other relay apps we tried. We occasionally had to try a couple of time before we were able to sync successfully. Alert messages are another very nice feature.

LuteRunner ,

Not great - not worth the $

They didn't bother to update the leg distances for Ragnar NWP and the app would spontaneously reset the custom leg distances after they were manually adjusted. Also, no way to adjust runner times if you mess up at the exchange.


Richard Marion
217.2 MB
Health & Fitness

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
This app may use your location even when it isn't open, which can decrease battery life.
© 2013-2016 RPM Mobile LLC


  • Family Sharing

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

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