SpyFu is a competitive intelligence platform focused on PPC and SEO keyword research. StoreVitals is an automated ecommerce store health monitoring tool. They solve fundamentally different problems.
SpyFu is about competitive intelligence — understanding what your rivals are spending on ads and ranking for organically. StoreVitals is about your own store's health — finding and fixing the technical issues that suppress your rankings. Most growing ecommerce stores need both: StoreVitals to keep their own site healthy, and competitive research tools if they're running serious paid campaigns. Start with getting your own store's health right.