Ditch the chest strap. Use your Apple Watch as a heart rate monitor for your Garmin Edge, Wahoo ELEMNT, Hammerhead Karoo, or any BLE-equipped cycling- or fitness computer — no extra hardware needed.
The HRM Heart Rate Monitor app reads your heart rate from Apple Watch via HealthKit and broadcasts it from your iPhone over Bluetooth Low Energy. Your cycling computer picks it up as a standard heart rate sensor, just like a chest strap — but without one.
COMPATIBLE DEVICES
• Garmin Edge 540, 550, 840, 850, 1040, 1050, 130, Explore, …
• Wahoo ELEMNT BOLT, ROAM, ACE
• Hammerhead Karoo 2, Karoo 3
• Any cycling computer, indoor trainer, or fitness app that accepts BLE heart rate sensors
Other models not listed here may be compatible. Full compatibility list and setup guide: https://gethrm.app/compatibility/
KEEP IT SIMPLE
• Works with your iPhone locked and in your jersey pocket
• Your heart rate data stays in Apple Health — private and secure
• No workout tracking, no training zones, no account required
• Requires both Apple Watch and iPhone
Join over 45628 cyclists already riding strap-free. Try it free for 7 days — then just $4.99/year.
HEALTH DATA
HRM uses HealthKit to read heart rate data from your Apple Watch. This data is only used to broadcast your heart rate to your cycling computer. It is never used for advertising or data mining purposes, and is not shared with third parties.
Terms of Use: https://gethrm.app/legal/terms/
SUBSCRIPTION
HRM Heart Rate Monitor requires a subscription ($4.99/year) after a free 7-day trial. Your subscription automatically renews unless cancelled at least 24 hours before the end of the current period. Your Apple Account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscription in your Apple Account Settings at any time.
Tried to get this working with Garmin edge. The garmin connected without much headache, but I could never get HR to actually push to the computer. My watch would show my heart rate, and record a workout, but the phone app never seemed to get into a state that would grab it and push it to the computer.
Developer Response
Thanks for your feedback!Unfortunately, not all Garmin Edge models are compatible and most require a specific procedure to follow. Please check this: https://dominikmaglia.com/hrm-app-user-guide/#device-compatibilityBest regards,Dominik
Works with Wahoo Bolt with some work
LaFong
I have the app working with my Bolt. I really like it now. My tips:1) Leave a few minutes before riding to get it running. 2) Make sure the Elemnt or Wahoo app is not running. Also make sure Background App Refresh is turned off for those apps. 3) Start HRM apps on both phone and watch. Make sure you see HR on both devices. 4) Be sure to Start the app on the watch. 5) If you have already added the HRM sensor, _delete_ it. I have to add the sensor back on every ride or it never connects. 6) Answer No when it asks whether to remove HR from your computer pages. 7) Add the sensor back. 8) Wait for several seconds for the HRM sensor to connect. The sensor should show the HR on the settings screen. If it just says Connected, it won't work. It will show N/A for BPM on a workout page. Make sure the watch app is Started, not just running. 9) Check an activity page to confirm you see HR. 10) If no HR, reboot the phone and begin again.
Developer Response
Hi LaFong,Thanks a lot for sharing your experience! I‘ll try to get your tips into the official guide to make it easier for all Wahoo users :)Best,Dominik
Frustrating
Djizzones
Not worth it. 1/4 rides collected data. I’ve done all the things before my rides to ensure connection but today the app disconnected 2 minutes into my ride (Wahoo Element V2). Didnt notice until an hour later. But even then, If i had noticed i would have had to stop my ride and take 5 minutes to delete the HRM from my unit, turn off Bluetooth, turn back on Bluetooth, close and re open app, stop and start watch app, reconnect to Element, and hope that its actually broadcasting my heart rate or do this again 3 more times until it does *sigh*
Garmin
Jerhalco
Off and on connecting to Garmin 540. Not sure what the key is. But when it works it’s great
This update adds compatibility information for the Garmin Edge 550 and Edge 850.
Version 1.7.1
The developer, App Lane OU, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
