Cherry Seed

Why is Safari killing my marketing attribution?

safari itp safari tracking prevention safari attribution broken safari marketing tracking

Quick Answer

Safari's Intelligent Tracking Prevention (ITP) blocks all third-party cookies, limits JavaScript-set first-party cookies to 7 days, and can restrict server-set cookies to 24 hours when the referring domain is classified as a tracker (Meta is always classified as a tracker). It also strips click IDs like fbclid and gclid from URLs. This means: returning visitors after 7 days look like new users, Meta ad clicks lose attribution within 24 hours, and cross-site tracking pixels simply don't work. With Safari holding ~20% browser market share (higher on mobile), this creates massive blind spots. The fix is server-side tracking and first-party data storage.

Full Answer

Safari's Intelligent Tracking Prevention (ITP) is the most aggressive browser privacy system. It blocks third-party cookies entirely, limits first-party cookies to 7 days (or 24 hours from ad clicks), and strips tracking parameters. For marketers, this means Safari users effectively disappear after a week. What Safari ITP Does Third-party cookies: Fully blocked since 2020. Facebook Pixel, Google Analytics client-side, and all cross-site tracking are prevented from setting cookies. First-party cookies (JavaScript-set): Limited to 7 days maximum. After 7 days without a visit, Safari treats returning users as completely new. Link decoration (fbclid, gclid): When Safari detects tracking parameters from classified domains, cookie expiration drops to 24 hours. Click a Facebook ad Monday, cookies expire Tuesday. Site data deletion: All data deleted after 30 days of no user interaction with the site. The Attribution Impact A typical customer journey: 1. Clicks Facebook ad on Monday 2. Browses but doesn't buy 3....

Sources

Programmatic Access

GET https://seresa.io/wp-json/cherry-tree-by-seresa/v1/seeds/225

Cite This Answer

Cherry Tree by Seresa - https://seresa.io/seed/safari-browser-privacy/safari-killing-attribution