iOS 14 Signal Loss — 2026 State of Play

Three years after Apple's App Tracking Transparency (ATT) launched with iOS 14 (2021), the performance marketing community has settled into a 'post-signal' normal. In 2026: most advertisers run a combination of MMM (Marketing Mix Modeling) for budget decisions, modeled conversion APIs for platform optimization, and incrementality geo-holdout tests for true lift measurement. The 'single source of truth' for attribution no longer exists for most B2C advertisers. MER (Marketing Efficiency Ratio) — total revenue / total marketing spend — has become the blended metric most performance teams report to leadership.

This is the foundational context for every conversation with performance marketers and UA operators. Attribution is broken. Anyone who says otherwise is lying or selling something. AI-powered attribution tools (Triple Whale, Northbeam, Rockerbox, Measured) are all fighting for the 'true measurement' position. Seva's buyers live in this ambiguity. Content that acknowledges this without pretending to have solved it is immediately credible.

• "3 years after iOS 14, here's what performance marketing actually looks like now"
• "MER is the only honest performance metric in 2026. Here's why your CAC is probably wrong"
• "The attribution measurement stack in 2026: what's real, what's noise, what's vendor theater"