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CP Appointment Calendar is a WordPress plugin which allows you to define “available” time slots that can be booked by the website visitors. It’s integrated with Paypal for receiving the booking payments.
It’s pretty useful for booking/management of meetings/appointments for lawyers firms, teachers, doctors, veterinaries, beauticians, etc… and for any kind of activity which is developed with specific schedule during the day.
Features:
<ul>
<li>The website visitors can select an available time slot for the appointment and pay for it through Paypal / credit cards.</li>
<li>Once a time slot has been booked and paid it’s doesn’t appear as available in order to prevent duplicated bookings.</li>
<li>You receive an email after each confirmed (paid) booking.</li>
<li>The user receives a thank you/confirmation email after completing the payment.</li>
<li>Allows customizing the contents of the notification/confirmation emails.</li>
<li>Allows defining the product name at Paypal, the currency, the Paypal language and amount to pay for a booking (you can set zero to let the user pay/donate the desired amount).</li>
<li>Allows defining the working days and the exact time slots available.</li>
<li>Allows defining the number of months (calendar pages) to show at the same time for the booking calendar.</li>
<li>Supports date format as mm/dd/yyyy and dd/mm/yyyy</li>
<li>Supports both am/pm and military time.</li>
<li>You can define the start day of the week.</li>
<li>You can define the minimum available date and the maximum available date for the bookings.</li>
<li>You can restrict specific dates.</li>
<li>Easy Ajax administration for the calendar.</li>
</ul>
Please note that this is a plugin originally designed to accept bookings linked to PayPal payments. The feature for working without PayPal is implemented/available in the Pro version: https://wordpress.dwbooster.com/calendars/cp-appointment-calendar#download

CP Appointment Calendar

CP Appointment Calendar allows you to define "available" time slots that can be booked by the website visitors.

Creavi

Creavi Appointment Booking Calendar is a free WordPress appointment booking calendar with Google and Outlook availability sync, reliable customer and admin reminders, built-in video meetings, and no monthly booking fee.
Create bookable services, define your availability, collect customer details, send confirmation emails, and let customers book online in a clean calendar flow. You can offer in-person meetings, phone calls, custom meeting links, or secure video meetings generated directly by the plugin.
Build a polished booking page in minutes with drag-and-drop Gutenberg blocks. Add a ready-made Service Hero section, a Booking Profile layout, an inline booking calendar, or a popup booking button without designing everything from scratch.
Creavi is built for consultants, coaches, clinics, salons, agencies, educators, and small service businesses that want a practical booking system without monthly booking software.
Easy Setup – Ready in 2 Minutes 
Watch how it works in action:
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/KdV1pQHp-oI?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&start=1&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
Check out the live demo: <a href="https://wordpress.creavi.dk/booking/" rel="nofollow ugc">https://wordpress.creavi.dk/booking/</a> 
We’re open to any suggestions! Feel free to reach out via the support forum — we’re happy to hear your ideas and may implement them in future updates.
Free Features Included
Creavi gives small service businesses a complete booking setup for free, including calendar sync, automated reminders, custom booking forms, video meeting options, and ready-made Gutenberg booking page layouts.
<ul>
<li>Add booking button anywhere via shortcode: <code>[creavibc_booking_button id="123"]</code> (opens booking popup)</li>
<li>Embed full booking interface directly on page via shortcode: <code>[creavibc_booking_inline id="123"]</code></li>
<li>
Support multiple booking widgets on the same page (different services)
</li>
<li>
Smooth booking experience:
<ul>
<li>Popup or inline layout</li>
<li>Step-by-step flow: Date → Time → Details</li>
<li>Fully responsive and mobile-friendly</li>
</ul>
</li>
<li>
Flexible availability settings:
<ul>
<li>Admin-defined available days via date picker</li>
<li>Rolling availability range (e.g. next 30–365 days)</li>
<li>Exclude specific dates (days off, holidays)</li>
<li>Minimum time before booking (buffer)</li>
</ul>
</li>
<li>
Flexible weekday-based time slots:
<ul>
<li>Visual grid selector (e.g. Mon 9:00, Tue 10:30)</li>
<li>Different time slots per weekday</li>
<li>Optional slot duration: 20 / 30 / 60 minutes</li>
<li>Dynamic time slots based on selected date</li>
</ul>
</li>
<li>
Smart timezone handling:
<ul>
<li>Admin timezone detection</li>
<li>Timezone modes:</li>
<li>Localized (auto-adjust to user timezone)</li>
<li>Locked (fixed business timezone)</li>
<li>Clear timezone indication on frontend</li>
</ul>
</li>
<li>
Customizable booking form fields:
<ul>
<li>Toggle default Name & Email fields</li>
<li>Add unlimited custom fields (text or textarea)</li>
<li>Set any field as required</li>
</ul>
</li>
<li>
Automated email notifications & reminders:
<ul>
<li>Sent to both admin and customer</li>
<li>Dynamic tags: <code>{name}</code>, <code>{email}</code>, <code>{date}</code>, <code>{time}</code>, <code>{service}</code> </li>
<li>Optional reminder emails before the appointment (reduce no-shows)</li>
</ul>
</li>
<li>
Google Calendar integration:
<ul>
<li>Automatically push bookings to Google Calendar</li>
<li>Block already booked time slots from Google Calendar</li>
<li>Google Calendar link generation for attendees</li>
<li>Custom Google event title and description templates</li>
</ul>
</li>
<li>
Outlook Calendar integration:
<ul>
<li>Automatically push bookings to Outlook Calendar</li>
<li>Per-service Outlook connection and sync</li>
<li>Block busy Outlook time slots on the frontend</li>
<li>Custom Outlook event title and description templates</li>
</ul>
</li>
<li>
Calendar & scheduling:
<ul>
<li>Downloadable <code>.ics</code> (iCalendar) file</li>
</ul>
</li>
<li>
Meeting & location options:
<ul>
<li>In-person meetings</li>
<li>Online meetings (video or custom link)</li>
<li>Phone call option</li>
</ul>
</li>
<li>
Built-in video conferencing:
<ul>
<li>Automatic meeting link generation </li>
</ul>
</li>
<li>
Personalization options:
<ul>
<li>Custom brand color</li>
<li>Personalized thank-you message</li>
</ul>
</li>
<li>
Easy booking management
</li>
<li>Clean and minimal admin UI</li>
<li>
Works with Gutenberg, Elementor, and other page builders
</li>
<li>
Multilingual & Translation Ready
</li>
</ul>
<h3>Languages</h3>
This plugin is fully translation-ready and supports localization via translate.wordpress.org.
Available languages include: 
* English (default) 
* French 
* Danish
You can help translate this plugin into your language at: 
https://translate.wordpress.org/projects/wp-plugins/creavi-booking-service/

Creavi Appointment Booking Calendar

Free WordPress appointment booking calendar with Google and Outlook sync, reliable reminders, built-in video meetings, and no monthly booking fee.

CP Appointment Calendar vs Creavi Appointment Booking Calendar