Use your Polar H10 fitness tracker to see your (or your horses!) heart beats in real time on a standard graph paper.
Record the data to review it later, show it to your doctor (or your horses horse-doctor).
The app also can store heart rate information to the Health app. The app only stores the information, that is, it doesnt read anything from the Health app.
No in-app purchases, ads or subscriptions!
Disclaimer: This app does not provide medical advice. If you feel unwell seek the advice of your physician or other qualified healthcare provider.