The Wellbeing Diary is a general purpose health tracking application. It's designed to track everything you could feasibly want to track; heart rate, blood pressure, blood glucose, mood, habits, food, weight, and so on. It's meant to be a complete package for tracking your health.
It's developed as a progressive web application, meaning it should function and feel like a native app on Android and iOS, and behave as a normal web application on the desktop. But for bonus points; it works offline too!
The Wellbeing Diary is closed source, and I charge a $3 USD/month fee to use it (though it is available for a one month free trial).