HR BroadcastGetting started
- Install HR Broadcast on your Apple Watch from the App Store (on the watch, or from the Watch app on your iPhone).
- Open it and allow Health access, so it can read your heart rate.
- Pick Ride, Run or Other and press Start. The watch starts advertising as “HRB”.
Trying it on the couch? Turn on Test signal in Settings to check pairing without starting a workout.
Pairing with Zwift
In Zwift's pairing screen, tap Heart Rate and choose HRB. If Zwift runs on the iPhone your watch is paired with, it may list the watch by its own name instead. Pick that one.
You only pair once. When a session ends, HR Broadcast keeps the connection ready, and data resumes the next time you press Start.
Treadmill calibration
Indoors, your watch estimates speed from your steps. Calibrate once and it learns your stride:
- Open Calibrate and follow the countdown. It walks you through 3 or 5 speeds, from your slowest walk to your fastest run.
- Or use Treadmill (Crown) mode and set the belt speed with the Digital Crown.
Troubleshooting
| What you see | What to do |
|---|---|
| Heart rate shows “Delayed” | watchOS delivered a late reading. Tighten the band a little and keep your wrist still for a moment. |
| Zwift shows no heart rate | Check the watch says “Broadcasting”. Then unpair HRB in Zwift and pair it again. |
| The session stopped by itself | Auto-stop ended it after asking: nothing was connected, the watch was off your wrist or the battery was low. Change this in Settings. |
Contact
Still stuck? Email support@buttonbench.com with your watch model, watchOS version and the app you're pairing with.