Apptoto is a fully automated appointment reminder, messaging and online scheduling software that fully integrates with Google Calendar and Google Contacts to provide automatic Voice, SMS, and Email reminders for your clients.  You can also use Apptoto to allow clients to book appointments with you online using real-time calendar availability.

If you would like to use Apptoto as a Google Calendar Add On, please install the Apptoto Add On here: http://www.apptoto.com/s/googlecaladdon