Quarkbase is a free web service to check statistics and performance of a website. It contains comprehensive informations of a referred site instantly after an URL being submitted. Here are some quick hints of what kind of information you can get:
** Intro
Official description, contact details and registered domain information
** Popular
* Popularity of a website on several social sites service: Delicious, Digg, Reddit, Yahoo! Answers, Technorati, Wikipedia, StumbleUpon and Google Groups.
* Popular Pages : Delicious, Digg, Twitturly, Reddit, and Stumbleupon
* Feeds Information: Feeds URL, Subscriber Count and Graph
** Traffic
* Alexa traffic rank for a website
* Reach percent of global internet users visiting info
* Top Countries by user pageviews and rank in country
* Top Subdomains
* Pageviews: Number of unique pages viewed per user per day
** People
Associated People (website ownership) by Name Location and Description
** Spotlight
Exerpt of website content recent updates if there’s any from Technorati, Twitter and Google News
** Company
Company profile information of a website
** Technical
Web Development by Framework, Webserver, Blogging platform, Hosting service and many more
Submit your website URL to give a try. This web tool may be very useful to look up some fixes needed whenever you get all infos about site performance, or even worth by comparing your competitor’s website to yours ;)
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I use http://www.estimix.com to calculate how much traffic a website has. It seems to provide much better traffic information and competitive analysis for free.