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Hi Marco, many sensors like the Polar and Whoop use standard HRM Bluetooth protocols to communicate with third-party apps. I am curious if you know of ring sensors with the same capability. I tested the Oura ring, and it appears they use a proprietary HRM BTLE protocol. I want to experiment with an open HRV ring if you are aware of any of them. Thanks for all your excellent research and advice.

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thanks Yair! Unforotunately I am not aware of a ring that complies to standard protocols and to the heart rate profile to communicate to third party apps (and indeed the Oura ring certainly does not, while the whoop band in broadcasting mode can be used). I have to say that I am not following the market much, and there are many rings out there, so some might be able to offer this functionality (even though I'd also worry about accuracy and look for validations with respect to ECG or chest straps).

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