Calibre is a Lighthouse-based performance monitoring platform — acquired by Vercel in 2022 — that runs scheduled audits against pages and tracks scores over time. It's well-regarded in the JavaScript and frontend engineering community. StoreVitals is a broader ecommerce-focused health auditing tool covering performance plus SEO, security, accessibility, and content quality.
Calibre is the right tool for engineering-led teams that have already adopted Lighthouse as their primary performance gate and need continuous monitoring with CI/CD integration. StoreVitals is the right tool for ecommerce store owners and agencies who need a broader health audit — performance, SEO, security, accessibility — without requiring a developer to interpret results or set up infrastructure. Stores running on Vercel/Next.js with active engineering teams often graduate from StoreVitals to Calibre as performance becomes a daily concern; stores led by non-technical owners or scaling agencies stay with StoreVitals because the broader audit surface catches the SEO and content issues that hurt rankings independent of Core Web Vitals.