Companies Using jQuery UI

I spend much of my time on what our detection rules can and cannot tell apart, and jQuery UI is a case where the count is real but the decision behind it rarely belongs to the site owner. As of our October 2026 crawl, TechnologyChecker.io finds jQuery UI on 5,108,595 domains, and we matched 3,174,403 of them to a company. Most of those sites didn't choose it. WordPress did, or a theme or plugin built for it.

What the rule sees

We count a domain when a page exposes the version number jQuery UI attaches to jQuery (jQuery.ui.version) or loads a script whose file name contains "jquery-ui". The first signal catches WordPress, which ships jQuery UI as separate files under /wp-includes/js/jquery/ui/. To see where installs come from, I opened a random sample in a browser and from the command line. Of the first ten domains that gave a clear answer, nine loaded jQuery UI from WordPress core and one, an online shop, served its own copy of version 1.10.3. None loaded it from a public CDN, although the jQuery CDN and Google Hosted Libraries both host every release. On four of the seven WordPress sites I checked in a browser, the only jQuery UI file on the page was core.min.js, the base module other scripts depend on.

Sales Signal: a jQuery UI detection identifies a WordPress-era site far more often than a team that writes jQuery UI code. Use it to size the WordPress small-business web, not to find front-end engineers.

Growth trajectory

Our current window runs from 4,087,666 domains in June 2026 to 5,108,595 in October, a 25% rise I wouldn't read as adoption. Counts are not a like-for-like series: the set of domains we crawl turns over every month, with dead sites dropping out and newly found ones added, and our detection signals widen over time. Most of the rise came in one step, 616,687 domains between June and July. Exits are large in absolute terms. 652,803 domains have dropped jQuery UI on at least one hostname since we began tracking it on 16 March 2026. When I re-checked, 87,125 of the 653,270 domains then showing a drop still ran it on another hostname, so most exits are whole sites that were rebuilt without it or went offline.

"Almost nobody installs jQuery UI on purpose any more, and almost nobody removes it on purpose either. It arrives with WordPress and leaves when the site is rebuilt or shut down." - David Thomson, CTO at TechnologyChecker.io

Sales Signal: the base is huge and close to flat. Plan around rebuild and maintenance cycles on existing sites, and don't treat month-on-month movement as a buying signal.

The companies behind the domains

The matched base is small business. 63.4% of companies with a known size have 1 to 10 employees and 86.62% have 50 or fewer. By founding year, 36.82% date from the 2010s and 19.48% from the 2020s. That's the profile of WordPress's customer base, not of a developer tool.

The enterprise tail, 35,537 companies above 1,000 staff, shows up on specific surfaces. Investor relations is the clearest: 13 of the 50 companies on our list were detected on an investor subdomain, and all nine Q4-built sites I could load, Apple's, Ford's and Uber's among them, reported jQuery UI 1.12.1, 1.13.2 or 1.14.1. Careers and community platforms are next. Disney's French careers site pulls 1.14.0 from the TalentBrew platform's CDN, and IBM's community site loads 1.13.3 through Higher Logic. Starbucks and the US Department of Veterans Affairs get it from Drupal core. The jQuery UI project publishes no customer list, so every company named on this page comes from our own detection.

Sales Signal: at a large company the jQuery UI decision usually sits with a vendor (an investor-relations, careers or community platform) or a CMS. Pitch the platform owner, not the company's engineering team.

Industry and geography

Construction leads the industry chart at only 4.15%, ahead of Retail (3.76%), Business Consulting and Services (3.32%) and Real Estate (3.31%). The top ten industries add up to 28.9%, so the base is about as horizontal as they come. Healthcare is a sizeable cluster once you combine Medical Practices (59,708 companies) and Hospitals and Health Care (50,040), 109,748 between them. The United States leads with 687,491 matched companies (21.66%), with Germany (245,672) a distant second.

Sales Signal: for agencies selling WordPress rebuilds or care plans, jQuery UI is a proxy for a WordPress install in almost any vertical and country. Filter by industry and country first, then use the version (below) to rank urgency.

Overlap, not switching

Our switching table for jQuery UI is empty, and it should be. jQuery UI needs jQuery, and 5,054,781 domains run both today, all but 101 of the 5,054,882 live jQuery UI domains in our raw count. The libraries that sit beside it behave the same way. Of 2,334,187 domains we have ever seen running jQuery UI with Swiper, 2,017,619 still run both; for Modernizr the figures are 956,658 and 833,367, and for Slick 729,656 and 614,378. None of those pairs is a migration. They're layers of the same WordPress theme.

"When 2,017,619 of the 2,334,187 sites that ever ran jQuery UI with Swiper still run both, there's no corridor to sell into. These libraries arrive together and leave together, with the theme." - David Thomson, CTO at TechnologyChecker.io

Sales Signal: don't pitch "replace jQuery UI" as a standalone project. The realistic event is a theme change or a site rebuild, and that's when the library goes.

The stack around it

Across the 5,027,831 live jQuery UI domains in our stack analysis, WordPress runs on 75.94% and Elementor on 56.99%. Bootstrap is on 26.42% and Google Analytics on 52.35%. Hosting reads like a small-business list: GoDaddy 11.54%, Hostinger 9.9%, IONOS 3.4%. Modern frameworks barely register, with React at 4.66%, Tailwind CSS at 4.6% and Vue.js at 4.07%.

Sales Signal: the 4.66% that run React next to jQuery UI are the interesting minority for front-end consultancies. Two generations of front-end code on one domain often means a stalled migration.

Version debt

The jQuery UI blog describes the project as being in a maintenance state: compatibility with new jQuery releases and security fixes, but no significant new features. Version 1.14.2 shipped on 28 January 2026, and the 1.13.x line stopped being supported when 1.14.0 came out on 5 August 2024. In a sample of 245,942 domains from our latest crawls (one in twenty of the domains we detected), 46.44% ran the 1.14 line, 29.46% ran 1.13 and 22.88% ran 1.12 or older. WordPress explains the top of that table. The WordPress 7.1.3 sites I opened load 1.14.2 from core, while a WordPress 5.8.1 site in the same sample still loads 1.12.1, a release from September 2016.

Sales Signal: the version is the useful filter. A site on jQuery UI 1.12 or older is often running an old WordPress core or a hand-built page nobody has touched in years, which makes it a candidate for security and maintenance work.

Key takeaways

• 5,108,595 domains in October 2026, #4 in JavaScript Libraries with 5.81%, counted as sites rather than customers.
• 75.94% run WordPress, and nine of the first ten sampled sites loaded jQuery UI from WordPress core.
• The matched base is small business: 63.4% have 1 to 10 employees.
• Enterprise detections sit on vendor platforms: Q4 investor sites, careers and community platforms, Drupal.
• No switching corridor. 5,054,781 domains run it with jQuery.
• 52.34% of sampled domains run a version line the jQuery UI team no longer supports.

Sales applications

Targeting: on TechnologyChecker.io, filter jQuery UI, keep WordPress, then add the industries and size bands that match your price point.

Outreach: "Your site still loads jQuery UI 1.12.1, a 2016 release outside the project's support. We update WordPress sites like yours without changing what visitors see."

Competitive angle: the 4.66% of jQuery UI domains that also run React are maintaining two front ends. They're the natural audience for a single component library and a planned migration.

The full list of 5,108,595 jQuery UI domains and 3,174,403 matched companies is on TechnologyChecker.io.