Download websites that use FullCalendar

About FullCalendar

Most JavaScript libraries tell you something about how a page was built. FullCalendar tells you what the page is for. A site does not load a calendar and scheduling library by accident, so a detection is reasonable evidence that behind the front end there are appointments, class times, event listings, staff shifts or room bookings that visitors are expected to see and often to act on.

That functional reading is what makes the list commercially useful rather than merely descriptive. As of October 2026 we detect FullCalendar on 7,638 sites, and the population leans toward clinics, studios, tutoring services, coworking spaces, municipal event pages, clubs and congregations, and internal tools that happen to sit on a public domain. Vendors selling booking engines, appointment payments, staff scheduling, reminder messaging or no show recovery are chasing that same population, and a library detection reaches it more directly than an industry classification ever will.

The geography reinforces the picture. A commercial, English language skew fits a library that gets picked when a developer builds a booking flow instead of buying a packaged platform. Country attribution here is inferred from hosting and registration signals rather than declared by the sites, so it deserves to be read as a strong hint and not as a census.

FullCalendar has been available since 2010 under the MIT licence and written in JavaScript, which explains part of the spread. A free library with adapters for the major frameworks becomes the default choice when someone needs a calendar view quickly, and it also travels inside themes, plugins and admin panels that the site owner never selected deliberately. Some of what we detect is therefore a dependency rather than a decision, and from the outside the two are not always separable.

Detection also runs into the usual limit of modern front ends. When a library is compiled into an application bundle its identifying markers can disappear, so the real footprint is larger than the count. Undercounting in this category is systematic and worth stating plainly before anyone sizes a market on it.

A lookup tool tells you that one site runs a calendar. The downloadable list is what turns the signal into a segment, because it can be filtered, counted and cross referenced. Combine it with ecommerce and payment detections and the booking businesses separate from the pure event listings. Combine it with CMS data and the custom builds separate from the plugin driven installs. Watch the same list over successive releases and you can see which of those sites are actively maintained, which is usually the question underneath all the others.