That's interesting. Is my understanding that the health app does not allow heart rate data to read by 3rd party apps.
Is the app for jail broken devices?
No, I don't think that is true. The app is available in the app store, just doesn't read HR yet. The new version, is supposed by released in early June. There are other apps in the app store that read heart rate from the Health app (such as Health Data Display), but it is usually just summarized by hour, etc.
The developer was actively seeking beta testers, see last post in this thread:
https://discussions.apple.com/thread/7053459
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