Intelligent Tracking Prevention (ITP)

The dominant browser-native privacy enforcement mechanism for Safari, affecting a significant portion of global web traffic and setting industry standards for cookie and tracking restrictions.

Intelligent Tracking Prevention (ITP) is a privacy-focused technology feature built into Apple's Safari browser, first introduced in 2017 by Apple engineer John Wilander and the WebKit team. ITP uses machine learning to identify and restrict domains that have the ability to track users across websites, limiting the lifespan of cookies, blocking third-party cookies by default, and preventing fingerprinting techniques commonly used by advertisers and data brokers. ITP has undergone multiple iterations since its launch, with each version (ITP 1.0, 1.1, 2.0, 2.1, 2.2, 2.3, and beyond) progressively tightening restrictions on tracking mechanisms. Key capabilities include capping first-party cookie lifetimes set via JavaScript to seven days (and in some cases 24 hours), blocking all third-party cookies by default, and restricting link decoration tracking. These changes have had profound implications for the AdTech ecosystem, forcing advertisers, DSPs, DMPs, and analytics platforms to rethink attribution, audience targeting, and measurement strategies. In the AdTech ecosystem, ITP is one of the most disruptive privacy technologies alongside Firefox's Enhanced Tracking Protection and Google's Privacy Sandbox. Because Safari commands a significant share of mobile and desktop browsing — particularly among high-value demographics in the United States — ITP's restrictions have materially impacted retargeting, cross-site audience building, and conversion tracking. It has accelerated industry adoption of server-side tracking, first-party data strategies, and privacy-preserving measurement solutions.