Companies Using Zone.js

I worked on crawling at Bing before founding TechnologyChecker, and Zone.js is a signal that rewards reading the mechanism before the number. As of our October 2026 crawl, TechnologyChecker.io finds Zone.js on 157,139 domains, and 83,190 of them match a company record, a 52.9% match rate. Three months earlier the same rule counted 962,258, and most of the difference is one website builder changing its code.

What the signal catches

Our rule checks for the global Zone.root object, which Zone.js creates when it loads, and it doesn't care what loaded it. Zone.js is the change-detection helper Angular shipped by default until version 21, when zoneless became the default for new projects. So the count is mostly Angular apps: 130,110 of 152,475 clean live domains (85.33%) also run Angular. Another 4,369 show AngularJS, which doesn't use Zone.js itself, so those domains run a newer Angular app beside an old one or a hybrid of the two. The rest are sites where we didn't catch Angular itself, including the Squarespace leftovers described below.

Sales Signal: Read a Zone.js detection as "this domain runs a conventional, zone-based Angular app". That's narrower and more useful than "uses Angular", because it also tells you the team hasn't finished moving to zoneless change detection.

Growth trajectory: one platform left

Our current crawl window reads 929,185 Zone.js domains in June 2026, 962,258 in July, 326,044 in August, 155,170 in September and 157,139 in October. The fall is Squarespace. Its sites carried Zone.js in the platform's own page code until August, and of the 889,320 domains that have dropped Zone.js since we began tracking it on 16 March 2026, 849,531 run on Squarespace. I opened five of them in October, on both 7.0 and 7.1 templates, and none loaded Zone.js.

Outside that event, the usual caution applies. 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. One leftover needs flagging. 12,540 Squarespace domains are still counted live because the hostname that carried Zone.js hasn't been re-crawled since July, and the ones I sampled don't load it any more. Treat about 144,600 (157,139 less 12,540) as the firmer October figure.

"Zone.js lost 84% of its footprint in two months, and almost none of it was Angular teams leaving. When a library rides inside a platform, the platform's release notes move the count more than any developer decision." - Mehmet Suleyman, CEO & Co-founder at TechnologyChecker.io

Sales Signal: Ignore the chart's cliff when you size an Angular market. Previously-used lists for Zone.js are almost entirely Squarespace sites, so they're no use as "former Angular users". Work from the October base and the Angular overlap instead.

Which Angular versions sit behind it

Angular writes its version into the page, so we can read it beside Zone.js. In the 30 days to 13 October 2026 our crawl read both on 119,658 domains. 68.13% of them (81,521) ran Angular 19 or older, outside Angular's support window: angular.dev lists only versions 20, 21 and 22 as supported, and long-term support for 20 ends on 28 November 2026. Angular 17 and 18 alone cover 20,501 domains. Upgrading hasn't removed Zone.js either. On Angular 21 and 22, 27,259 domains still load it and 8,114 don't, so 77.1% have kept it.

Sales Signal: This is the opening for Angular consultancies and modernisation vendors. Two-thirds of zone-based Angular sites run an unsupported version, and the ones on current versions still have the zoneless move ahead of them. Pair a Zone.js list with the version on each page and you have an upgrade pipeline.

The companies behind the domains

The matched base is small at the core and heavy at the top. 50.89% of companies with a size band have 1-10 employees, but 3,936 have more than 1,000, including 833 above 10,000. In our named list, large companies run Zone.js on portals, stores and sign-in flows: Deloitte on my.deloitte.com (Angular 21), ADP on signin.adp.com (Angular 10), TD on ix0.apps.td.com (Angular 16), Eli Lilly's trial finder (Angular 17), Boston Scientific's online store (Angular 21) and Cummins' parts catalogue (Angular 17). Freelancer is the rarer case of a main site, running Angular 20 on freelancer.com. By founding year, 36.55% date from the 2010s and 22.59% from the 2020s, while 8.49% predate 1960, BASF (1865) among them.

Sales Signal: At an enterprise, go to the team that owns the detected surface. A sign-in page on Angular 10 and a store on Angular 21 call for different pitches: the first is an upgrade project, the second a zoneless and performance conversation.

Industry and geography

The United States leads with 18,962 matched companies, and Germany is close for a front-end library at 6,520, about one for every 2.9 in the US; on PrimeVue's profile the ratio is 5,367 to 338. Brazil (4,920), India (4,883) and the United Kingdom (4,278) follow, and Colombia (1,846) sits level with the Netherlands (1,850). Software Development (6.88%) and IT Services (6.03%) lead the industry chart, and finance matches software once you add Financial Services (4.63%) and Banking (2.25%). The top ten industries cover just 36.66%, so this is a horizontal base.

Sales Signal: Germany is the second-largest Zone.js market in our data, which makes it a priority for agencies and staffing firms selling Angular skills in Europe. Banks and financial services firms are the natural vertical for modernisation offers.

Why there's no migration table

Teams don't choose Zone.js over a rival library; it arrives with Angular. A switching table would mislead. The overlaps say the same thing: of the domains that ever ran both, 136,956 run Angular and Zone.js together today, while Vue.js (5,341), React (4,768) and Svelte (1,495) overlap, most likely because one domain hosts several apps. The real move away from Zone.js happens inside Angular, when a team turns on zoneless change detection, and our rule sees that only as Zone.js disappearing from a site that keeps Angular. Component kits ride along too: PrimeTek's PrimeNG shares CSS class names with its Vue library, and the PrimeVue profile removed 6,845 such domains that had no Vue.js, many of them Angular apps.

"The migration worth selling into is zone-based Angular to zoneless Angular, and on the newest versions three in four sites haven't made it yet." - Mehmet Suleyman, CEO & Co-founder at TechnologyChecker.io

Sales Signal: Pitch the zoneless migration, not a framework switch. Angular's own guide lists performance, Core Web Vitals and debugging as the gains, which gives a consultancy a business case it can quote.

The stack around it

Across 152,480 clean live domains, Microsoft ASP.NET runs on 10.55% and Express on 8.82%, the usual Angular back ends in .NET and Node shops. Ionic (3.71%) marks apps built with Ionic's mobile toolkit. core-js (52.45%) and jQuery (45.82%) are the most common libraries alongside it. Hosting leans to Amazon Web Services (13.21%), Firebase (5.77%) and Azure (5.24%), with Vercel at 1.85%. Squarespace still shows on 8.75%, most of it the stale leftover described above.

Sales Signal: The ASP.NET slice is the enterprise .NET buyer, with an Angular front end on a Microsoft back end. Firebase on 5.77% marks a smaller Google-stack group, a natural fit for vendors selling into Angular and Firebase teams.

How to use this list

Filter Zone.js plus Angular to drop the Squarespace leftovers, then read the Angular version on each detection URL; it sits in the page's ng-version attribute. Older versions point to upgrade work, Angular 21 or 22 with Zone.js still loaded to a zoneless migration. Add a size band of 51-1,000 employees (20.35% of matched companies) to reach mid-sized teams. A sign-in or portal subdomain points to an internal product team, a main-site hit to the web team.

A workable opener: "I noticed [surface] runs Angular [version] with Zone.js. Angular 21 made zoneless the default, and versions before 20 are out of support. Here's how [product] helps with the upgrade."

Build and export the list from all 157,139 Zone.js domains and 83,190 matched companies on TechnologyChecker.io.