AstrMap·Review Insights

Amazon has made a major move that many sellers may not have noticed yet.

COSMO algorithm is fully launched.

In simple terms, this is an AI-driven product recommendation system running in parallel with the original A9/A10 algorithm. A9 determines if you can enter the candidate pool; COSMO determines if you get recommended to users.

This means whether your product gets recommended depends not only on sales and keywords, but also on user feedback.

And the most direct expression of user feedback is reviews.

Amazon recently dropped a bombshell — the variation review policy is set to fully implement on May 31.

In simple terms: previously multiple variations shared reviews, now they won’t.

If you sell products with “5 colors, 3 sizes” multi-variations, this policy directly affects you.