When a product has no cost per item, Shopify reports that cost as $0.00 and books the whole sale as profit. It does not warn you. On a store where half the catalogue is missing costs, Shopify's own AI calls the margin "healthy". Free, forever, no SKU limit: find every variant with no cost, see how much recent revenue has none behind it, and export the list. Keep ($29): margin as a range, set costs in the app, import history, alerts. Pro ($79): price list import, auto-restore, landed cost.

• Finds every variant with no cost and ranks the gaps by what they distorted
• Real margin as a range, using the cost in effect on the day of each sale
• Set costs from the ranked list; get alerted when a new gap appears