Sitescore, probably the most prominent analytics tool in this overview, delivers a detailed report on dozens of various design-related aspects. Every single key point is evaluated and rated according to its performance on the scale from 1 to 10. Among other things Sitescore analyzes the quality of incoming and outgoing links, keyword density, page titles, plagiarism, popularity rank, the usage of popups and the effectiveness of site’s structure. Sitescore also grades the printability, readability, spiderability and usability of the page as well as spelling and W3C compliance

Performing over 35 tests, the tool analyzes 5 pages which are selected depending on the internal links on the page. You can tweak your Sitescore rating as long as you find the optimal level of user-friendliness and validity.

Another tool with similar approach is the Page Strength SEO Tool. It measures the relative importance and visibility of a page, the potential strength and ability to rank in the search engines and presents data on popularity, links & mentions of the page across the Web. The tool is designed to satisfy the curiosity of webmasters, surfers and web marketing professionals seeking a better metric to quickly assess a site/page’s relative importance and visibility.

Blog Juice estimates blog’s value upon the approximate number of Bloglines subscribers, Alexa rank, the ranking assigned by Technorati and the number of inbound links.

Similar to Sitescore, Webagogo tests the quality of web sites and presents the results as reports in a brief overview. The tool performs markup and style analysis, accessibility tests, usability tests, speed benchmark tests and calculates SEO effectiveness. Not really spectacular, but it’s nice to have some important checkpoints ready to hand.

The usage of the service isn’t straight-forward as you have to verify the ownership of a web site and have access to an e-mail address on the site’s domain.