3sheep

The plugin allows you to create a number of appointment slots and reply to any bookings with a configurable confirmation email message.
Once the plugin is installed you can use the settings interface to set the length of the standard appointment as well as configuring the following items for the confirmation email:
<ul>
<li>The ‘From’ address.</li>
<li>The BCC address to copy in for each confirmation email.</li>
<li>The prefix for the confirmation email subject.</li>
<li>The body of the email message.</li>
</ul>
Appointments can be added by entering the date and time and then clicking ‘Add Appointment’. To delete or reset an appointment select the checkbox next to it and clicking the appropriate button.
To include the booking form into a page or post use the shortcode [tsbooking].

3 Sheep Booking

Provides a simple interface to allow a Wordpress blog to take appointment bookings with an…

Slawomir Klimek oxtilo

Oxtilo Fast Cal is a secure and flexible booking management system for WordPress. Features robust availability handling, ICS calendar synchronization, email notifications, and a full REST API. Includes built-in Polish translations.
<h4>Features</h4>
<ul>
<li>Service Management – Define multiple services with duration and type (online/in-person)</li>
<li>Booking Intervals – Configurable slot intervals (15, 30, or 60 minutes)</li>
<li>Manual Bookings – Administrator can create bookings for any time, including outside working hours</li>
<li>Frontend Management – Clients can reschedule or cancel bookings via secure links</li>
<li>Working Hours – Configure working hours for each day of the week</li>
<li>Availability Calculation – Automatic slot availability based on working hours and existing bookings</li>
<li>External Calendar Sync – Import busy times from iCloud, Proton Calendar, or holiday calendars via ICS</li>
<li>ICS Feed Export – Private calendar feed for syncing bookings to external apps</li>
<li>Email Notifications – Automatic notifications to admin and clients with ICS attachments and customizable templates</li>
<li>Mobile Friendly – Responsive booking form with quick date selection (Today/Tomorrow)</li>
<li>REST API – Token-authenticated endpoints for external integrations (Apple Shortcuts, Zapier)</li>
<li>Built-in Polish Translations – No <code>.mo</code> file needed for Polish locale</li>
</ul>

Oxtilo Fast Cal

A secure and flexible booking management system for WordPress with availability handling, ICS sync, and REST API.

3 Sheep Booking vs Oxtilo Fast Cal