Download websites that use Integral Ad Science

About Integral Ad Science

Ad verification is the part of the advertising stack that nobody builds for the reader. Integral Ad Science belongs to the Advertising category and does work that is invisible in the browser window: confirming that an impression was actually in view, that it appeared beside content an advertiser is willing to be associated with, and that the request came from a human rather than from automated traffic. The code sits between the publisher and the buyer, and its purpose is to produce evidence that both sides will accept.

Because verification exists to reassure the buyer, the presence of this code on a page says more about how a site sells advertising than about how the site is built. A publisher running it is generally selling inventory to advertisers or agencies who will not pay without independent measurement, which in practice means programmatic supply, managed direct campaigns, or both. Sites monetising through a single network rarely carry a verification wrapper at all. Sites that do carry one are usually operating at a scale where measurement terms are negotiated rather than accepted.

Integral Ad Science has run the platform since 2009, and the product is Proprietary, so a deployment is the visible end of a commercial arrangement rather than a snippet copied from a forum. For anyone selling into ad operations, the distinction is the whole point. A site with verification in place has already absorbed the cost and the reporting overhead of measuring its own inventory, and it has an operations function capable of maintaining the tags.

Detection here deserves a plain caveat. A significant part of verification code is delivered inside the ad creative at serve time rather than hardcoded into the page template, so a crawler loading a page without a live auction filling every slot will miss installations that a real visitor would trigger. Our figure should be read as sites where the measurement layer was visible at crawl time, not as the full population of publishers under contract. Undercounting is the expected direction of the error.

As of October 2026 we detect Integral Ad Science on 854 sites. A per-domain lookup answers whether one publisher you already know about has verification in place. A downloadable list answers the reverse and harder question, which is which publishers, in which countries and site categories, have committed to independent measurement at all. Mapping premium supply, sizing a competitor's footprint, benchmarking brand safety adoption across a vertical or building a prospect file of media owners who already treat measurement as a budget line are all population questions, and a population question needs the whole set rather than a sequence of individual checks.