You will see 31 pairs of English-language web-page screenshots. Each pair comes from a real A/B test: real visitors saw one of the two versions, and one version measurably caused more visitors to act.
For each pair, scroll both versions, then judge which version caused more visitors to take the stated action. Use the separate Zoom 2.5× buttons whenever details are small. Answer with your professional judgment; there is always a real answer. Two screens are attention checks with explicit instructions.
Participation is voluntary. By continuing, you confirm that you are at least 18 and consent to your responses being stored pseudonymously under your Prolific ID and analyzed in aggregate for this model-evaluation study. We collect no name or email address. You may withdraw before submission by closing this page. Questions: martin@150strangers.com.