As of October 9, 2026, FullCalendar is used by 62,354 websites in the TechLeads index: 0.34% of all Widgets detections, the 31st most-used of 389 Widgets technologies.
Quoting these numbers? Credit TechLeads with a link to this page.
Citation
TechLeads. "FullCalendar Customers and Market Share." Data as of October 9, 2026. https://techleads.fyi/technology/fullcalendar/market-shareHTML link
<a href="https://techleads.fyi/technology/fullcalendar/market-share">FullCalendar market share (TechLeads data)</a>Websites using each technology in the TechLeads index, and its share of all Widgets detections.
| # | Technology | Websites | Share |
|---|---|---|---|
| 1 | Slider Revolution | 2,671,151 | 14.4% |
| 2 | ThemePunch | 2,030,140 | 11.0% |
| 3 | Facebook Like Button | 1,625,313 | 8.8% |
| 4 | Facebook Comments | 1,567,304 | 8.5% |
| 5 | Typekit Async | 1,364,354 | 7.4% |
| 6 | WPForms Lite | 1,173,361 | 6.3% |
| 7 | FitVids.JS |
In HTTP Archive's monthly crawl of public websites, FullCalendar was detected on 252,433 pages in September 2026, down 10.1% from a year earlier (peak: 307,820). HTTP Archive is a separate dataset from the TechLeads index, so its numbers are not added to ours.
Same month, other Widgets technologies in HTTP Archive: Twitter 714,427, AddToAny 370,920, ShareThis 235,553, Elfsight 216,437, FlexSlider 194,251.
Based on country-code domains (such as .de or .co.uk); websites on .com and other generic domains are not assigned a country.
See all 62,354 websites using FullCalendar or download the full list as a CSV for $29.
TechLeads scans public websites and detects FullCalendar from signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Market share is FullCalendar's website count divided by the website counts of all Widgets technologies we track; a site using two Widgets tools counts for both. Counts were last refreshed on October 9, 2026 and update daily.
| 1,066,099 |
| 5.8% |
| 8 | reCAPTCHA Enterprise | 849,702 | 4.6% |
| 9 | 627,078 | 3.4% |
| 10 | Max Mega Menu | 468,355 | 2.5% |
| 11 | AddToAny | 349,544 | 1.9% |
| 12 | Hu-manity.co | 328,160 | 1.8% |
| 13 | ShareThis | 297,864 | 1.6% |
| 14 | Elfsight | 268,155 | 1.4% |
| 15 | Instagram Feed Pro | 266,082 | 1.4% |
| 16 | AddThis | 246,963 | 1.3% |
| 17 | ICP Non Commercial Website | 195,988 | 1.1% |
| 18 | Smush Pro | 174,458 | 0.94% |
| 19 | Twitter Widget | 171,123 | 0.93% |
| 20 | Twitter Timeline | 155,819 | 0.84% |
| 21 | FullCalendar | 62,354 | 0.34% |
Rows link to each competitor's market share page where one exists. The table lists the 21 most-used technologies; ranks are by website count.