ECHO iWatch Heart Rate is a free app that enables you to turn your Apple Watch into a Bluetooth heart rate monitor. You can use it for free for 20-minute workouts. This app allows you to connect your Apple Watch and receive heart rate data on your Peloton®, iFit®, Zwift®, Precor®, Life Fitness®, Nautilus®, Echelon®, NordicTrack®, Bladez®, SOLE®, Wahoo® app, and Schwinn®. It works with any workout equipment that supports connecting to a Bluetooth heart rate monitor.

Echo requires access to Health to read heart rate from your Apple Watch, and the heart rate data is never stored or shared. The app simply receives the heart rate data from your Apple Watch via Health and delivers it to your connected device. It is important to note that this app requires a connected Apple Watch, series 3 or newer.

It is highly recommended to test the free version of the app to ensure compatibility with your device before purchasing the pro version. The app's privacy policy indicates that they value users' privacy and never store, share, or sell any user information.

Overall, ECHO iWatch Heart Rate is a useful app for fitness enthusiasts who want to track their heart rate during workouts on various equipment.