Download websites that use Umbraco

About Umbraco

A site ends up on Umbraco because of a decision taken well upstream of the website itself. The platform is built on Microsoft's ASP.NET stack and written in C#, which means it rarely arrives by accident. The organisation behind the domain already runs on Microsoft infrastructure, or the development partner is a .NET agency rather than a WordPress shop, or an internal IT function had a say in the choice. Detecting a CMS usually tells you something about the website. Detecting Umbraco tells you something about the company that owns it.

Umbraco HQ has developed the platform since 2003 and releases the core under the MIT licence, with revenue coming from cloud hosting, support and commercial add-ons rather than from the software itself. The licensing model has a practical consequence for anyone reading this list. Nothing is gated by a purchase, so adoption is not filtered by budget, and the installed base runs from public sector portals and university estates down to small agency builds that were handed over years ago and never touched again.

As of September 2026 we record Umbraco on 9,000 sites. The count is what you would expect from a platform whose reach is bounded by the .NET hosting world, and the composition of the list matters more than its size. Umbraco tends to sit in corporate and institutional web estates, on the kind of domain that also carries enterprise analytics, a consent platform and single sign-on rather than a page builder and a shopping cart.

Version evidence is thin here, and pretending otherwise would be misleading. A normal Umbraco installation does not announce its release in the page it serves, so what we hold is 3 distinct version values in total, the one recurring most often being 4.7. Version strings of that kind come from the small share of installations that leak a release through a static asset path or a leftover generator tag, not from the field as a whole. Treat the version column for this platform as a sample, and treat the absence of a version on a given domain as no evidence in either direction.

The people who need the whole list are rarely trying to identify one site. Agencies and integration vendors in the Microsoft world size a market they can sell into, hosting companies look for migration candidates, security teams want the set of domains to check when an advisory lands, and researchers compare framework-bound platforms against the PHP mainstream. A per-domain lookup answers whether a single site runs Umbraco. The downloadable list answers which companies run it, on which domains, in which country, under which TLD and alongside which analytics, commerce and consent tooling, and a question shaped like that cannot be assembled by checking domains one at a time.