“For every one person that was answering the quiz, three were going directly to the App Store. We studied with a lot of math and rigor the correlation between those that were coming through our happy path and what was happening outside it, and those ratios were very very tight every time we had a new winning creative.”

Correlate quiz-path metrics with direct App Store installs to scale spend confidently when blind

Ladder discovered that 3x more users went directly to the App Store than completed the web quiz funnel — invisible in tracking data. Stewart's solution: rigorously validate the ratio between tracked (quiz) and untracked (direct App Store) installs across multiple creative changes and budget shifts. Once the parallel movement was confirmed as stable, quiz-path metrics became a reliable proxy for total business impact.