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Web usability is a critical factor for visitors' acceptance and satisfaction. The prevalence of various free and proprietary website testing tools enabled the fast evaluation of the usability of websites. However, their effectiveness in providing meaningful, consistent, and valid results remains questionable. In this study, we initially devised a usability framework that incorporates 19 usability dimensions and investigated the compliance of 10 popular web usability testing tools to this framework. Next, we applied the automated evaluation to nine websites spanning three major categories, namely e-commerce, vacation rentals, and education. On a positive note, the tools inspected a wide range of aspects, including performance, SEO, page size, accessibility, and security. However, our in-depth analysis revealed numerous critical issues. First, usability seems to be ignored or distorted by most of the tools. Second, the …