I like that it is easy to set up reminders, send them out via text message or email (or both), and then track when they are opened/read in real time! The only thing about this app which could be improved upon would probably be its ability to sync with other calendar apps such as Google Calendar so you can have one place where all of your appointments go instead of having multiple calendars across different platforms. For those who need quick reminder services without paying exorbitant fees - we've been using reminadr since last summer at our small business and haven't had any complaints thus far. We use it mainly for appointment reminders but also sometimes just sending general notifications if someone has not responded after several days within their allotted response window.