Are there other apps that do the same thing as Echo?

There are a few other apps in the Apple App Store that attempt to broadcast your Apple Watch heart rate as a Bluetooth heart-rate monitor. Most of these are small 'hobby apps' created by individual developers. Echo is the #1 app of its kind and is actively developed and supported by PK Fitness Apps, an established app company whose apps collectively serve millions of users worldwide. Echo offers regular updates, reliable compatibility, active customer support, and secure, privacy-focused app design.