OOS checker: estimate revenue lost to stockouts

The OOS checker is the fastest way to turn an abstract inventory problem into a concrete priority list. It does not only show that products are sold out; it shows which variants and bestsellers matter most.

The key difference is prioritization. A total OOS rate can look harmless when long-tail products are affected. But when bestseller sizes, colors, or bundles are missing, revenue loss appears immediately and performance marketing becomes inefficient.

As a tutorial page, this resource explains how teams should interpret the checker: first bestsellers, then variants, then estimated revenue loss, then reorder questions and forecast gaps. This creates a concrete audit plan instead of only a dashboard screenshot.