Use your Polar H10 fitness tracker to see your (or your horse's!) heart beats in real time on a standard graph paper.
Record the data to review it later, show it to your doctor (or your horse's horse-doctor).
The app also can store heart rate information to the Health app. The app only stores the information, that is, it doesn't 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.