It's a app to analyze your site visitors and analyze any site's information such as alexa data, similar web data, whois data, social media data, Moz check, DMOZ check, search engine index, google page rank, IP analysis, malware check etc. combined with some other great SEO tools such as link analysis, keyword position analysis, auto keyword suggestion, page status check, backlink creation / search, website ping, google adword scraper etc.
You will get some bonus utility tools such as email encoder / decoder, metatag generator, ogtag generator, plgiarism check, valid email check, duplicate email filter, url encode / decode, robot code generator etc.
It has native APIs by which developers can integrate it's facilities with another app.
Nice colorful widgets are available. You can simply copy & paste some line of codes to any page you want and can display site information.