Companies Using Umbraco

I pulled Umbraco out of our October 2026 crawl to see who still builds on a .NET CMS, and the answer is more European and more corporate than I expected. A domain counts when its pages carry one of Umbraco's own fingerprints: the X-Umbraco-Version header, an Umbraco generator tag, Umbraco Forms markup, links in Umbraco's umb:// format or calls to its /umbraco/ endpoints. I checked the test on 166 random live domains. 147 loaded, and 134 of those showed one of the markers in the page source or in a browser. Seven more served images from Umbraco's media folders, and six showed nothing on the homepage that day. That leaves 13,372 live domains, 8,593 of them matched to a company.

Domains, not companies

Count accounts before you count rows. In the same sample, 42 of the 147 domains that loaded (29%) redirected to another domain. Some are old brand names. Some are typo domains: teleperformamce.com and proud2betp.com both land on tp.com, TP's main site. A large organisation can appear several times, once per alias and once per subdomain, like registrar.osu.edu at Ohio State or careers.nationalhighways.co.uk.

Sales signal: dedupe an Umbraco list by redirect target and root domain before you size a territory. The account count will come in well under the domain count.

Slow growth since July

The chart reads 10,195 in June, 12,657 in July, 12,794 in August, 13,259 in September and 13,372 in October. The June to July step is mostly our side: the domains we crawl turn over every month as dead sites drop out and new ones come in, and our detection signals widen over time. Since July the line has added 715 domains, about 5.6%. Some sites do leave. 1,073 domains dropped Umbraco since we began tracking it in mid-March 2026, and we can't yet say how many of those were sites closing down.

"Umbraco's line moves slowly, the way a mature product's does. The map stands out: the UK alone has more Umbraco companies than the United States." - Emma Davies, Data Analyst at TechnologyChecker.io

Sales signal: treat Umbraco as a stable pool of about 13,000 domains. Sell to the sites that already run it; new adopters arrive slowly.

Older and larger than it looks

38.65% of matched companies with a known size have 1 to 10 employees and 26.75% have 11 to 50. The tail is heavier than Craft CMS's, though. 502 companies have more than 1,000 staff, about 6.2%, against 1.8% on Craft's profile. Age tells the same story: 50.87% were founded before 2000 and 15.79% before 1960, while only 6.26% date from the 2020s. The large names lean industrial. PACCAR, Danfoss, Kohler, Smiths Group and Carlsberg Group are all on the list, and Carlsberg's back office signs in through Umbraco Cloud, the vendor's hosted service, rather than a self-hosted install.

Sales signal: at a 1,000-plus company, an Umbraco site is often run by a digital team with an agency partner. Find out who the agency is before you go looking for the buyer.

A North Sea CMS

The United Kingdom has 1,961 matched companies, the Netherlands 1,427 and the United States 1,261. Denmark, where Umbraco is based, adds 752. Add Sweden (497) and Norway (215) and the three Nordic countries hold 1,464, more than the US. The consent data follows the map. Cookie Control, Civic's consent banner, runs on 22.62% of Umbraco domains, against 9.67% on Craft CMS's, and Cookiebot is on 19.4%. The public sector is a real segment too: Government Administration holds 2.5% of matched companies, with Lancashire County Council and Cornwall Council on the list, and Imperial College Healthcare NHS Trust is there too.

Sales signal: for UK public-sector accounts and Dutch or Danish mid-market firms, an Umbraco list is a sharp starting point. US prospects exist, but they are a minority of the base.

Where sites go, and where they come from

All counts here are domains since mid-March 2026. WordPress is the large two-way flow: 173 domains left Umbraco for WordPress and 107 came the other way, 126 and 85 of them in the last 90 days. Against the .NET platforms the direction flips. 29 domains moved to Umbraco from Kentico, Sitecore, Optimizely or DNN, and 8 went back. Sitecore alone sent 11 and took 1. These are small numbers, but they point the same way. Webflow takes more than it gives, 16 out and 6 in, and two Umbraco domains moved to Craft CMS.

"Umbraco loses sites to WordPress and wins them from the other .NET CMSs. Both flows are small, but the second says something about where .NET teams think the value is." - Emma Davies, Data Analyst at TechnologyChecker.io

Sales signal: for Umbraco agencies, Sitecore and Kentico sites in their region are the warmest replatforming prospects. For anyone selling against Umbraco, the 173 domains already moved to WordPress show that the switch happens, and in which direction.

The stack around it

Umbraco is written in C# and has run on ASP.NET Core since version 9 (Wikipedia). Yet Microsoft ASP.NET registers on only 31.21% of Umbraco domains. Our ASP.NET test needs a header, session cookie or ViewState field that many current builds don't send, so the figure says more about server configuration than about who runs .NET. Google Analytics is on 73.13% and Cloudflare on 32.32%. JavaScript front ends are rare: Next.js on 1.19%, Blazor on 0.39%. A site that uses Umbraco only as a headless back end, with another framework rendering the pages, can show none of Umbraco's markers, so most of those builds sit outside our count. Site search barely registers. Algolia is on 0.37%, Cludo on 0.32% and Raffle on 0.19%.

Sales signal: almost no Umbraco site runs a dedicated site-search tool. For a search vendor with a .NET integration, this list is mostly open ground.

What it costs

The CMS is free and open source under the MIT licence. Umbraco, founded in 2003 and headquartered in Odense, Denmark, according to its about page, also sells Umbraco Cloud. Cloud starts at €45 a month for Starter, then €280 for Standard and €730 for Professional, with Enterprise quoted (pricing page, checked 10 October 2026). Every plan is hosted on Microsoft Azure. The long-term-support line is Umbraco 17, at 17.7.1 since 6 October 2026, and the release page schedules Umbraco 19 for 10 December.

Sales signal: the licence costs nothing, so the budget goes on hosting, agencies and add-ons. Those are the line items to sell into.

Key takeaways

1. 13,372 live domains, #48 in CMS & Website Builders and close to Sitecore's 14,847.

2. A UK, Dutch and Nordic base: the UK has 1,961 matched companies to 1,261 in the US.

3. Older and larger than Craft CMS's base, with 50.87% founded before 2000 and 502 companies above 1,000 staff.

4. Loses sites to WordPress (173 out, 107 in) and gains them from the other .NET CMSs (29 in, 8 out).

5. 29% of sampled domains redirect elsewhere, so dedupe before you count accounts.

How to use this list

Filter by country and company size, then dedupe by redirect target and root domain. Good places to start are UK councils and NHS trusts, Dutch and Danish mid-market firms, and the 502 companies above 1,000 staff. This page shows 50 of the 8,593 matched companies. The full set of 13,372 Umbraco domains, with company, size and stack data, is on TechnologyChecker.io.