WordPress (and WooCommerce), Shopify, Magento, BigCommerce, PrestaShop, OpenCart, Squarespace, Wix, Webflow, Drupal, Joomla, TYPO3, Ghost, HubSpot CMS, Umbraco, Sitecore, Kentico and Craft CMS - plus the Yoast and Rank Math SEO plugins. The audit checks themselves do not depend on the platform; a site on any other stack is audited in full, and the fix suggestions are then written from the issue details alone, without a platform line.