WebsiteChecker is described as 'super easy to use digital marketing tool to analyze & monitor all 'need-to-know' metrics about any website' and is an website in the Network & Admin category. There are three alternatives to WebsiteChecker, not only websites but also apps for Windows and Mac. The best alternative is SEO Heartbeat, which is free. Other great sites and apps similar to WebsiteChecker are A1 Website Analyzer (Freemium) and SiteProfiler (Freemium).
A1 Website Analyzer can crawl websites and collect data to be used for finding site and SEO problems. Filter results to see which URLs are blocked by robots.txt, which are noindex, nofollow, canonical to self, canonical to other, response codes etc.