Google Merchant Center Diagnostics surfaces product feed errors that block Shopping ads. StoreVitals monitors the underlying product page health that drives organic ranking and conversion — they catch different failure modes.
These tools live on different sides of the catalog: Merchant Center monitors how Google interprets your product feed for paid Shopping ads; StoreVitals monitors the product pages those feed entries point to. Both matter and neither replaces the other. The integration pattern that works: Merchant Center catches feed-level disapprovals (missing GTIN, policy violations, price mismatches), StoreVitals catches page-level technical issues (broken schema, slow page speed, missing meta tags, broken product images, accessibility regressions) that hurt organic Shopping ranking and conversion even when the feed validates. Use Merchant Center for paid Shopping ad health, use StoreVitals for organic product page health. The feed is only as good as the page it points to — and the page is only as good as it ranks.