Maybe you can create a recipe on IFTTT.com to set a reminder with an alert for appointments if they are before a certain time of day. I haven't tried to create a time-based recipe before but you can see if it's possible https://ifttt.com/wtf
Agreed. When you launch, make sure your landing page has a short, easily digestible summary of what your product is, and a clear call to action for whatever it is you want users to do upon visiting your site. These articles have some good tips for landing pages:
I posted this yesterday and it was immediately killed and I was quite confused and worried that I had broken the all the rules on one of my first submissions. But now my colleagues can see the post. Was it resurrected? Is that a thing?
In any case, I created this website with the hope that it can be a handy reference for fellow web designers who fight these common UX battles with clients. Feedback is welcome.