HeartCast
HeartRate Broadcast from Watch
About
Broadcast your Apple Watch heart rate data in real-time to compatible cycling computers using Bluetooth. Offers direct or bridged modes for broad compatibility, with customizable heart rate zones and live updates on your iPhone's Dynamic Island and Lock Screen.
What's New in HeartCast
3.0
October 20, 2026
1. More reliable connections: bike computers that read the heart rate value before subscribing (Bryton, iGPSPORT, Magene and others) now complete the first handshake 2. Current heart rate is primed before broadcasting, fixing the "first connection fails, the second works" problem 3. Live Activity appears only while broadcasting, and no longer stays on the Lock Screen after quitting 4. In bridge mode, Apple Watch now mirrors the bike computer's connection state and connected count 5. Stability fixes
MoreDeveloper apps
FAQ
Does HeartCast have ads?
No, HeartCast does not contain advertisements. It is a completely ad-free application.
What devices does HeartCast support?
HeartCast is designed to work with both Apple Watch and iPhone devices, allowing for seamless data transfer and broadcasting.
How accurate is HeartCast's heart rate data?
HeartCast broadcasts real-time heart rate data directly from your Apple Watch. The accuracy is dependent on the Apple Watch's sensor performance, which is generally considered reliable for fitness tracking.
Can I use HeartCast offline?
Yes, HeartCast processes all data locally on your device and does not require an internet connection for its core functionality of broadcasting heart rate signals.
How often is HeartCast updated?
The latest version of HeartCast is 3.0, which was last updated on October 20, 2026. Updates typically focus on improving performance and compatibility.
What age rating does HeartCast have?
HeartCast has an age rating of 4+, making it suitable for users of all ages.
How does HeartCast handle my personal health data?
HeartCast prioritizes privacy by processing all data locally on your device. No personal health data is uploaded to any servers, ensuring full compliance with privacy regulations.
What are the heart rate zones in HeartCast?
HeartCast features 5 heart rate zones calculated using the Karvonen HRR formula. You can customize these zones based on your age and resting heart rate for personalized training.
