Appointments plugin has always used WP-cron to schedule email notifications and reminders to
WordPress Appointment Booking Plugins
Appointment booking plugins for WordPress that simplify online scheduling of your products and services. Accept payments with WooCommerce, automate your workflow and reduce no-shows with customer reminders. Trusted by thousands of businesses all around the world. Join them and start accepting appointments on your own site.
Appointments for WooCommerce
Simply the most complete appointment booking plugin on the market. Have perfectly organized calendar and reduce no-shows with advanced notifications and reminders. Offer free appointments or receive payments with any payment gateway you can imagine.
Set availability for each calendar date, day or hour. Set breaks for any date or time. Apply globally, for product or staff.
Set custom pricing rules that for any day, hour or combination of both. Also set pricing that is different for each staff.
Increase or decrease available places for particular appointment slots. Accept more customers, when you can.
Google Calendar Sync
Connect appointments with Google Calendar. Synchronization works 2-ways, so appointments are always up-to-date.