WebPageTest is the gold-standard performance testing tool for web engineers — waterfall charts, filmstrip views, and every metric imaginable. StoreVitals monitors your entire ecommerce store automatically across 20 categories, including performance.
WebPageTest is a diagnostic tool — you fire it at a single page when you want to understand why that page is slow. StoreVitals is a monitoring tool — you connect your store and it watches 20 health categories weekly. For performance-focused deep dives, WebPageTest is unmatched. For ongoing ecommerce health visibility across your catalog, StoreVitals is the right fit. Many performance-serious teams use both: StoreVitals for automated oversight, WebPageTest for investigating specific slowdowns.