Open the popup on any page and get twelve on-page checks marked pass, warning or fail: title and description length, canonical, meta robots, the robots.txt rule for that URL, H1, image alt, language, viewport, schema, hreflang and word count. Seven tabs go deeper: a headings outline, a link checker that HEAD-requests every URL to find broken ones, image file sizes, every JSON-LD block, the Open Graph card, and keyword density. It all exports to CSV or JSON. Free, no account, no tracking.