How Highest-CTR ranking works

Highest CTR ranks by click-through rate — clicks ÷ impressions — a raw ratio with no smoothing. It rewards efficiency, not traffic, so a product few people see but many click can lead. Any product whose CTR works out to zero is dropped — that includes a heavily-viewed product nobody has clicked, not just unseen ones.

1. The collection, unranked

A normal collection page. The order is whatever the catalog lists — the best performers could be buried on the second row where few shoppers scroll.

2. The ranking engine scores it

The engine divides each product’s clicks by its impressions over the window. There’s no Bayesian/Wilson smoothing — it’s the literal rate — with a single guard that drops every product scoring 0, whether that’s because it had no views or because it had views and no clicks. The highest rate takes #1, even if it’s seen the least. Engagement signals measure in whole days, so an hours-based window counts as one day, and a Period or Snapshot window falls back to the last 30 days.

3. The front row gets discovered

The strongest products now fill the front row — the slots that get the most views and clicks. That’s the payoff: ranking turns your best products into the ones shoppers see first. If fewer products clear the guard than your Max products cap allows, the leftover slots are filled from the collection’s current order, below every product that has a real CTR.