SEO Pro Extension is a free tool for Google Chrome, developed by MarketingSyrup. It is targeted at SEOs, marketers, bloggers, and copywriters. The extension offers a plethora of features, including the checking of the HTTP status of each page, the rapid detection of indexing or canonization problems, and the immediate verification of Core Web Vitals. Moreover, it allows the analysis of the heading hierarchy of each page, highlights nofollow links on a page, and identifies missing alt tags in images. The SEO Pro Extension is free of charge. There is no subscription fee.