StoreSignals tracks tool changes across 500,000+ Shopify stores. We detect installs, uninstalls, and migrations for email tools like Klaviyo, SMS platforms like Postscript, and performance tools. Why does this matter? A store switching tools is a buying signal. They're investing, scaling, or looking for something better. Agencies and SaaS companies use these signals to find prospects at the perfect moment — when they're already making decisions about their stack. Real leads, delivered daily.