Da Checker is a browser-based SEO tool for evaluating domain strength metrics across websites. It provides Domain Authority da pa checker from Moz, Domain Rating dr checker from Ahrefs, and Trust Flow tf checker from Majestic without installation. Real-time data from industry-standard APIs ensures accurate metrics on domain strength and backlinks. The platform supports bulk checking of up to thirty domains per batch on higher-tier plans, while the free tier allows three domains. Reports include domain strength and backlink analysis. Features include a bulk URL opener, Google index status checker, duplicate backlink checker, Duplicate content finder and data cleaner. Da Checker ensures privacy with client-side data processing, keeping lists within the browser. Additional tools include an on-page audit for technical SEO, a column combiner for spreadsheets, and a bulk hyperlink generator. It operates through any browser without requiring account creation.