CANNOT be used with an Apple Watch not any other heart rate monitoring device. “See ya!” HINT: when this company modernizes their business model, updates their app to sync with Apple Watches having built-in heart rate monitoring, then I will give this app something besides ONE star. TETHERING the app to the company’s own overpriced hardware? Capitalism at is best. Here are some recommended apps (from Poe, AI app): “Yes, there are several iOS-compatible apps that can sync with heart rate monitoring Apple Watches and are great for training purposes. Here are a few popular options: 1. Apple Fitness+: Integrates seamlessly with the Apple Watch, offering a variety of workouts and metrics, including heart rate tracking. 2. Strava: Popular among runners and cyclists, it tracks heart rate, distance, and pace, and offers social features. 3. MyFitnessPal: While primarily a nutrition tracker, it can sync with Apple Watch to monitor workouts and heart rates. 4. Runkeeper: A running app that tracks your pace and heart rate, providing audio cues during workouts. 5. TrainingPeaks: Ideal for serious athletes, it allows detailed analysis of workouts, including heart rate data. 6. Zombies, Run!: A fun, immersive running app that incorporates heart rate monitoring into its gameplay. These apps can help you optimize your training by providing insights based on your heart rate and other performance metrics.