Quantcast is described as 'web site that is based on viewing the statistics of other Web sites. Quantcast Corporations prime focus is to analyze the Internets Web sites in order to obtain accurate usage statistics by surfers from the USA. Like Alexa, Quantcast rates web pages by ranks' and is a Web Analytics Service in the Network & Admin category. There are more than 10 alternatives to Quantcast, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux and iPhone. The best alternative is SimilarWeb, which is free. Other great sites and apps similar to Quantcast are Alexa (Paid), Site Rank Data (Free), Website Informer (Free) and ComScore Media Metrix (Free).
AdClarity is the leading Competitive Intelligence SaaS Solution for Digital Media. With AdClarity you can see which campaigns, creatives and traffic sources (i.e. websites that sell ad inventory) are working best for your competitors, and where they're not cost-effective.
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StatsCrop is a web service that lets you explore any website's information and its history, understand how your competitor's website operates, help you learn how to optimize your website, and increase your website traffic and income.