ContentKing plus Sitebulb charge for the longitudinal view of your SEO score. This reads the history Mega SEO Analyzer already stores in your browser and renders the per-URL line charts. Nothing leaves your machine.
Read the story behind this tool: Why I built this - the longitudinal view was already in your browser.
Related: Scheduled Monitor (paired) / Mega SEO Analyzer
This dashboard reads the same localStorage history that Mega SEO Analyzer and the Scheduled Monitor populate. Every run you do with history enabled lands here automatically.