Can I book an appointment with GravityCalendar?

Short answer: Unfortunately, no.

Long answer: Our GravityCalendar add-on is similar to a GravityView View layout; it allows you to display your form submissions on the front end in a calendar format by using a date field on your form. 

Here's a live example: https://site.try.gravitykit.com/calendar/

However, this plugin doesn't have any booking functionalities that can be used on your form. For that feature, we recommend two plugins: gAppointments and Gravity Forms Inventory by GravityWiz.