Interval Running: Run Tracker is a free iPhone application designed for runners who want to optimize their interval training. The app allows users to create custom run plans by setting specific goals for each interval, such as time, distance, or open goals. It provides real-time tracking of current interval goals, pace, cadence, and pulse, ensuring that users stay on track during their workouts.

This app is compatible with Apple Watch, enabling users to run custom workouts directly from their wrist. A built-in voice assistant aids in monitoring progress, and users can connect a heart rate monitor for enhanced tracking. The app also offers features for analyzing workout results, sharing achievements with Strava, exporting to GPX files, and saving data to the Health App, contributing to daily activity metrics.