Companies Using Headless UI

Headless UI is a useful developer signal, but only after cleaning. As of our October 2026 crawl, TechnologyChecker.io detects Headless UI on 14,697 domains, and 9,102 of them match a company record, a 61.9% match rate. Once the junk is out, a Headless UI hit is a fairly reliable marker of a team that writes its own React or Vue front end with Tailwind CSS. Getting to that point meant removing more than half the raw matches.

What the signal catches

Our rule looks for button and div elements whose id starts with headlessui-, the prefix Tailwind Labs' library, published under the MIT license on GitHub, assigns when a component renders (our post on technology detection methods explains how DOM signals like this are matched). It's a precise marker with one blind spot: a community Svelte port reuses the same ids. That port is what 15,296 SvelteKit matches were running, and nearly all of them were domain-for-sale landers from the Nameshift marketplace, served from buy.nameshift.com, usually with no page title. With those and 75 other for-sale or gambling pages removed, the raw 30,068 becomes 14,697. The count is still a floor, because a page whose menus are closed may render no id at all.

"More than half of what matched Headless UI was one marketplace's for-sale pages built with a Svelte port. Clean that out and the signal gets sharp: it marks teams that build their own React or Vue front end on Tailwind." - Mehmet Suleyman, CEO and Co-founder at TechnologyChecker.io

Sales Signal: Use Headless UI as a filter for in-house front-end teams. Unlike a website-builder signal, a headlessui- id means somebody wrote React or Vue code and chose Tailwind's component layer, which is the audience for design-system, accessibility-testing and front-end hiring offers.

Growth trajectory

We publish one clean point, October 2026. Earlier monthly totals were counted before we removed the Nameshift landers, so charting them would show that fleet growing rather than Headless UI. The cleaned count will build a series from here, and even then counts are not a like-for-like series over time: 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.

Sales Signal: Treat the October list as a snapshot to prospect from, not a trend line. If your offer depends on recent adoption, wait for the series and check first-detection dates rather than reading a new domain as a new build.

The companies behind the domains

The matched base is small and young: 61.02% of companies with a size band have 1-10 employees, and 74.76% of those with a founding year date from 2010 or later. Software Development (11.43%), Technology, Information and Internet (6.94%) and IT Services (6.83%) make up 25.20%, with Financial Services next at 4.67%. The United States leads with 2,390 matched domains, and English-speaking countries hold 3,823 of the 9,102, so most of the base is outside them.

The enterprise tail is 174 companies above 1,000 staff, and it uses Headless UI on specific surfaces. I opened all 50 detection URLs in our list on 12 October: 38 rendered a headlessui- element, and 28 of the 50 sit on a subdomain. MSCI uses it on its main site; DocuSign on trial.docusign.com; Vertex Pharmaceuticals on its clinical-trials finder; the International Rescue Committee on its Airbel Impact Lab site. Some rows came with a vendor's app: Servus Credit Union's appointments.servus.ca is a hosted booking page whose Headless UI was chosen by the scheduling vendor, not the credit union.

Sales Signal: At a large company, sell to the team behind the detected app. A trial sign-up or a clinical-trials finder built on Headless UI belongs to a product or marketing engineering group with its own release cycle, and a hosted booking page belongs to its vendor.

Why this profile has no migration table

Headless UI doesn't compete for an exclusive slot. It is built to be styled with Tailwind CSS, which runs on 97.9% of its domains, and it often runs next to other component libraries. Of the 2,690 domains we've seen running Headless UI and Radix UI together, 1,892 still run both; for shadcn/ui it is 1,246 of 1,790. Those are teams adding one library to another, so a "switched to Radix" row would mislead.

"Component libraries pile up inside one codebase. Seven in ten sites that ever ran Headless UI next to Radix still run both, which tells you these are additions, not replacements." - Mehmet Suleyman, CEO and Co-founder at TechnologyChecker.io

Sales Signal: Don't pitch a "migration off Headless UI". The better opening is consolidation: a codebase carrying Headless UI alongside Radix UI or shadcn/ui has two component layers to maintain, and that's a real conversation for design-system tools and agencies.

Reading the stack

Next.js runs on 63.20% of Headless UI domains and React Router on 9.81%, so this is mostly a React base. Vue.js shows on 19.52% and Nuxt.js on 8.07%, which is the Vue build of Headless UI. Vercel hosts 33.79%, Amazon Web Services 16.12% and Netlify 7.11%. Radix UI (12.8%), Framer Motion (11.3%) and shadcn/ui (8.4%) round out the component layer. WordPress appears on only 5.32%, while Sanity (4.38%) and Storyblok (1.28%) mark headless-CMS sites.

The Vue side deserves a closer look. npm shows @headlessui/vue's latest release, 1.7.23, on 9 September 2024, while @headlessui/react reached 2.2.10 on 7 April 2026. Up to a fifth of this base runs a package that hasn't shipped in over two years.

Sales Signal: For Vue tooling vendors and agencies, Headless UI plus Vue.js or Nuxt.js is a short, specific list of teams on a slow-moving dependency. For hosting and developer-tool vendors, the Vercel and Next.js overlap is the natural integration angle.

How to use this list

Filter Headless UI with Next.js or Nuxt.js to pick the framework you serve, then add a company size of 11-200 employees to get past solo builders; the 11-50 and 51-200 bands hold 32.52% of matched companies. Read the detection URL last: a main-domain hit suggests a company-wide front end, a subdomain hit one product team.

A workable opener: "I saw [surface] is built with Headless UI and Tailwind, which usually means your team owns its own component layer. Here is how [product] helps teams keep that layer consistent and accessible."

Build and export the filtered list from all 14,697 Headless UI domains and 9,102 matched companies on TechnologyChecker.io.