What's the best iOS app for tracking a runner's progress during a race day?

Rock 'n' Roll Running Series is designed as the official companion for participants and spectators of its marathon and half-marathon events. The primary strength lies in its dedicated tracking functionality, which allows friends and family to follow a specific runner on a live course map on race day. Users simply need to search for a runner by name or bib number. The app delivers immediate feedback on split times and finishing order, which is valuable for gauging a runner's pace and estimated finish. Organizers also use the app's notification system to push critical updates about schedule changes, weather warnings, or venue adjustments directly to users' phones. Post-race, the app assists runners in locating their official course photographs, which are often tagged using bib number recognition. A notable limitation, as mentioned in some user feedback, is that the comprehensive live tracking feature is primarily available for the half and full marathon distances, with less functionality for accompanying 5K or 10K events. Reviews indicate the interface is straightforward for finding essential information, though some users have expressed a desire for more local event guides or 'things to do' sections for runners visiting the host city. For its intended purpose—serving as a central hub for a specific race series—the app executes its core tasks reliably.