AI creative testing uses machine learning and behavioral AI to evaluate how creative assets — ads, videos, visuals, and packaging — perform with audiences before launch, measuring attention, emotion, and clarity at a speed and scale traditional research cannot match. This guide explains how AI creative testing works, what signals it measures across the SAY / DO / FEEL framework, how it compares to traditional testing, and a 5-step process any team can follow. It also covers where AI testing is accurate, where its limits are, and when human judgment stays in the loop.