Now you can spy or research on your competitors to know how much traffic their sites are getting?
There are a bunch of traffic estimation services (like Alexa, Compete, Quantcast, etc.) from where you can obtain statistics (page views + unique visitors) of almost any website for free but is the data accurate? I did a rough comparison using actual data from Google Analytics data and here are the results:
1. Alexa - Alexa won’t tell you the actual page views of a site but an estimate of the percentage of Internet users that may have visited your site during a given period. Now assuming that the number of Internet users did not changed drastically in the past 6 months or so, a site’s reach as determined by Alexa can be proportional to the unique visitors.
2. Trends for Websites - Google Trends uses data from Google search, Google Analytics and other third-party market research services. Since Google search is the largest source of traffic to most websites (especially those in the tech domain), Trends for Website can give a fairly accurate estimate of site traffic.
3. StatBrain - This is the only service that claims to provide a count of daily visitors to any website. StatBrain does so using data from a number of external sources like Alexa Rank, backlinks in Google, location of web server, etc.
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