Calendly for Shopify: Turn anything into a bookable service and start selling within minutes—no tech knowledge required. BookThatApp booking app lets you add custom questions to booking forms, send email or SMS reminders, and schedule bookings with Google Calendar, Outlook, iCal, Zoom, and more. Whether you're a tour provider, hotel, event organizer, class instructor (yoga, music, etc.), or rental business (dress rentals, boat rentals), BookThatApp manages all your appointment scheduling needs.