CollectionShuffler

Automatically rotate collection product order so more of your catalog gets consistent visibility. CollectionShuffler automatically randomizes product order in the collections you select. Choose a schedule for each collection, save it once, and review completed runs from the embedded Shopify admin app. Scheduling options range from daily and weekly rotation to hourly and 15-minute intervals. CollectionShuffler also provides manual shuffles on demand, uses Shopify's manual collection ordering, and never edits your theme.

This app's listing is still live, but it recently dropped out of Shopify's App Store search index.