The best alternatives to Dr. Link Check are GMass, Check a Site, and BrowserStack. If these 3 options don't work for you, we've listed a few more alternatives below.
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GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!
BrowserStack is the most reliable web and mobile app testing platform on the market today. Founded by developers, for developers, BrowserStack allows users to quickly and easily test their mobile and web applications across thousands of devices and desktop browsers in order to ensure their software meets and exceeds organizational and customer expectations.
AccessLint brings automated web accessibility testing into your development workflow. When a pull request is opened, AccessLint reviews the changes and comments with any new accessibility issues, giving you quick, timely, and targeted feedback, before code goes live.