WebCalendar vs Koalendar – Easy Appointment Scheduling & Booking Plugin

WebCalendar gives your WordPress site a clean, responsive calendar with the features you actually need — recurring events, iCal import, holiday imports, email reminders, and fine-grained permissions — without the complexity. Calendar Views & Display Month, week, and day views with smooth AJAX navigation — no page reloads Responsive design that adapts to any theme and screen size Color-coded categories for visual organization Gutenberg blocks (Calendar + Upcoming Events) and [webcalendar] shortcode Event Management Recurring events — daily, weekly, monthly, and yearly patterns with RRULE support Edit a single instance or the entire series File attachments via the WordPress Media Library Public, Private, and Confidential visibility levels Filter the calendar by tag, and jump straight to what visitors are looking for Venues and organizers — reusable places and contacts, managed in one screen, shown on every event page Custom event fields — text, dates, drop-downs and more, defined once and filled in on every event Online and hybrid events with a “Join online” link, separate from the physical location Conflict detection warns you about overlapping events (Starter+) Filter the calendar by venue and organizer (Starter+) Import, Export & Sync Import .ics files from Google Calendar, Outlook, Apple Calendar, or any iCal source One-click migration from The Events Calendar — venues, organizers, categories, images and recurring events, with undo Side-by-side trial: run WebCalendar next to The Events Calendar with scheduled one-way sync, then switch — or remove everything in one click Export your calendar in iCalendar format Import public holidays for any country Subscribe to remote iCal feeds with automatic hourly sync (Starter+) Collaboration & Permissions Invite WordPress users to events with email notifications Event reminders via WP-Cron 36 granular capabilities mapped to WordPress roles — control who can view, create, edit, and manage events Multi-user calendar filtering and shared calendar views Frontend event submissions with admin approval queue (Starter+) Category merging for cleaning up duplicate categories (Business+) SEO & Sharing Single event pages with SEO-friendly permalinks Schema.org Event JSON-LD, Open Graph, and Twitter Card meta tags Social share buttons and “Add to Google/Outlook/Yahoo” one-click buttons AI Integration Built-in MCP server lets AI assistants (Claude, ChatGPT, etc.) manage your calendar — free on every edition AI admin page with connection wizard, tools reference, and one-click testing WordPress Abilities API integration for WP 6.9+ For Developers Full REST API for events, categories, holidays, layers, and shared calendars Built on Clean Architecture with webcalendar-core business logic library PSR-4 autoloading, PHPStan Level 9, 1400+ automated tests All calendar data in dedicated webcal_* tables — no Custom Post Types Technical Note: Database Architecture This plugin integrates webcalendar-core, a framework-agnostic Composer library that provides all calendar business logic (events, recurrence, iCal, permissions) through 17 repository classes. These repositories require PDO and use exclusively parameterized prepared statements — no raw SQL concatenation. WordPress-specific data (users, options, capabilities) is accessed via $wpdb through the plugin’s Bridge layer (WpUserRepository, WpConfigRepository, etc.). See src/Bridge/PdoFactory.php for the connection factory. External Services This plugin connects to the following third-party services: Nager.Date API Used for importing public holidays via WebCalendar > Holidays. * Endpoint: https://date.nager.at/api/v3/ * Privacy Policy Google Calendar Public Feeds Alternative holiday source. Fetches public .ics files from Google. * Endpoint: https://calendar.google.com/calendar/ical/ * Google Privacy Policy * Google Terms of Service Thunderbird Holiday Calendars Alternative holiday source via community-maintained .ics files. * Endpoint: https://www.thunderbird.net/media/caldata/ * Mozilla Privacy Policy Freemius License Server Used for license validation, automatic updates, and optional usage analytics. * Endpoint: https://api.freemius.com/ * Privacy Policy * Terms of Service * Data transmitted: license key, site URL, plugin version, WordPress version OpenStreetMap / Nominatim When a single event page has a location and the map provider is set to OpenStreetMap (the default), the plugin geocodes the address via the Nominatim API and displays a map using OpenStreetMap tile servers. The event location string is sent as a search query. No user personal data is transmitted. * Geocoding endpoint: https://nominatim.openstreetmap.org/search * Tile server: https://tile.openstreetmap.org/ * OpenStreetMap Terms of Use * Nominatim Usage Policy * OpenStreetMap Privacy Policy Google Maps Embed API When the map provider is set to Google Maps in settings, single event pages display an embedded Google Map for the event location. The event location string and your Google Maps API key are sent to Google. No other user data is transmitted. * Endpoint: https://www.google.com/maps/embed/v1/place * Google Maps Platform Terms of Service * Google Privacy Policy Add to Calendar Links Single event pages include “Add to Calendar” buttons that generate links to Google Calendar, Outlook.com, and Yahoo Calendar. When a visitor clicks a button, the event title, date, time, location, and description are passed as URL parameters to the chosen service. No data is sent until the visitor clicks. * Google Calendar: https://www.google.com/calendar/render * Outlook.com: https://outlook.live.com/calendar/0/action/compose * Yahoo Calendar: https://calendar.yahoo.com/ Social Sharing Links Single event pages include social sharing buttons for Facebook, X (Twitter), and LinkedIn. When a visitor clicks a button, the event page URL and title are passed as URL parameters to the chosen service. No data is sent until the visitor clicks. * Facebook: https://www.facebook.com/sharer/sharer.php * X (Twitter): https://x.com/intent/tweet * LinkedIn: https://www.linkedin.com/sharing/share-offsite/ Development & Source Code Full unminified source for this plugin is included in this distribution under GPL-2.0-or-later — you do not need to download anything external to rebuild the compiled assets. What ships in this zip: src/ — unminified React/JSX source for all admin components, frontend calendar, and the mini-calendar widget build/ — the pre-compiled minified bundles (what the plugin actually loads at runtime) package.json + package-lock.json — Node build manifest and lockfile for reproducible npm install composer.json — PHP dependency manifest Rebuilding the compiled assets from source: Prerequisites: PHP 8.1 or higher with Composer 2, Node.js 20 or higher with npm 10. composer install — install PHP dependencies npm install — install JavaScript build dependencies (@wordpress/scripts, React, Toast UI Calendar, Leaflet, Tiptap) npm run build — compile src/index.js and src/frontend.js into the minified bundles under build/ The compiled output in build/ is byte-reproducible from the matching src/ at the same version using this toolchain.

Koalendar is a WordPress booking and appointment scheduling plugin that lets visitors book meetings, services, and appointments directly from your website. It removes the back and forth emails and manual coordination by syncing bookings automatically with your calendar. Built for WordPress users, Koalendar is easy to install, simple to configure, and works out of the box for individuals and small teams. It keeps availability up to date, prevents double bookings, and helps you turn any WordPress site into a complete online booking system in just minutes, with a Free Forever plan to get started. See Koalendar in action Watch how easy it is to set up and start accepting bookings on your WordPress website: Top Features WordPress booking and appointment scheduling plugin Unlimited booking pages and appointments Calendar sync with Google Calendar, Outlook, and iCloud Accept online payments for services and appointments Personalized booking pages that match your website design Multiple appointment types with custom durations Group bookings and classes with attendee limits Smart availability rules, buffers, and time off Team scheduling with shared and round robin availability Automated booking confirmations and reminders Easy embedding using WordPress blocks, shortcodes, or widgets Perfect for Koalendar is designed for small businesses, professionals, and teams who need a reliable scheduling system: Consultants and freelancers Coaches, tutors, and educators Agencies and remote teams Service based businesses Sales teams booking meetings and demos Anyone who needs an online scheduling calendar on their WordPress website Integrations Koalendar integrates seamlessly with the tools you already use, so your online booking system, calendar, and business workflows stay perfectly aligned. This allows you to manage appointments, meetings, and services without manual updates or double bookings. Calendar integrations with Google Calendar, Outlook, and iCloud to keep availability accurate in real time Video meeting integrations with Google Meet and Microsoft Teams, automatically generating meeting links for online appointments Payment integrations with Stripe, allowing clients to pay when they book an appointment or service Automation platforms such as Zapier, Make, n8n, and Pabbly to connect Koalendar with hundreds of apps and automate follow ups or internal workflows WordPress friendly setup, plus productivity tools like a Chrome extension for quickly sharing booking links Personalized Booking Pages Create clean, professional booking pages that match your brand and website design. Your visitors can make an appointment without leaving your website. Customize colors and layout Share a direct booking link or embed on any page Works with WordPress blocks, shortcodes, or widgets Optimized for desktop and mobile users Smart Availability and Calendar Sync Koalendar connects to all your existing calendars to keep your schedule accurate at all times. Sync with Google Calendar, Outlook, and iCloud Prevent double bookings automatically Set working hours, buffers, and time off Control availability per meeting or service Team Collaboration Built for teams that need shared scheduling. Schedule meetings with multiple team members Round robin and collective availability options Each team member connects their own calendar Perfect for agencies and growing small businesses Multiple Services and Appointment Types Koalendar lets you create multiple services and appointment types within a single booking system, each with its own duration, availability, and rules. This makes it easy to offer different kinds of meetings or services on your WordPress website without juggling multiple calendars or tools. Visitors simply choose the service they need and book an appointment online that fits your schedule. For example, a service based business such as a wellness studio, repair service, or local professional can create appointment types like initial visits, recurring services, or premium sessions, each with its own time length and booking rules, making it easy for customers to schedule the right service directly from the website. Group Bookings and Classes Koalendar makes it easy to manage group bookings and classes directly from your WordPress website. You can allow multiple attendees to book the same session, set participant limits, and keep everything organized in one scheduling system. This is ideal for workshops, coaching programs, fitness or wellness classes, and training sessions, where multiple people need to book the same time slot while you stay in control of capacity and availability. Custom Automations and Reminders (included in PRO plan) Send personalized confirmation and reminder emails before each appointment or meeting. This helps keep clients informed, reduces no shows, and saves time spent on manual follow ups. Custom Booking Forms (included in PRO plan) Collect additional information at the time of booking, such as contact details, service preferences, or special requests. This is especially useful for service businesses that need context before an appointment. Payments (included in PRO plan) Accept online payments for appointments and services directly through your booking system. Charge for consultations, classes, or sessions in advance to simplify billing and secure bookings before they happen. Backlog updates Here are some recent product updates: Appointment types (services): list multiple services directly on your booking page, each with its own price and duration Multiple and recurring bookings: invitees can book multiple dates, or set up recurring bookings, in a single flow Booking durations in hours or days: configure event durations using hours or days New booking page editor: redesigned editor for faster page creation and updates Koalendar available in Spanish and French File upload: collect files with the Google Drive integration Stripe Checkout: offer more payment methods and collect taxes Gmail integration: send booking emails from your own address New integrations: Zapier and Telegram Apple Pay and Google Pay supported automatically on supported devices and browsers