How it works
Connect a YouTube channel, pick a video, add thumbnail/title variants, and start a test.
We rotate assets via the YouTube API and allocate more traffic to winners using a multi-armed bandit — not a blind 50/50 forever.
Measurement reality
YouTube’s API does not expose true thumbnail CTR/impressions. We use available proxies (and optional Studio data where supported) with windows that respect analytics lag.
Metric goal
Default objective favors clicks that stick (CTR × retention style scoring) so pure clickbait does not win by default.