The ability to customize everything! It's not easy to find an app with so much customization options in one place. I really like how it can handle multiple appointments for different doctors all at once. Sometimes adding new users is slow because of the amount of data they have stored but this does get fixed eventually. Make sure you are using the paid version otherwise you won't be able to use some features such as recurring appointments or time slots. This has been very helpful when trying to keep track of my medical records for work purposes.
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