May 11, 2009

SEO - Alexa Rank

What is Alexa? The name is come from the Library of Alexandria the largest repository of knowledge in the ancient world. Alexa Internet, Inc. is a California-based subsidiary company of It was founded in 1996 with the vision of improving internet searching by tracking user decisions and using that data to aid future searches. In 1999, Alexa was acquired by and the company moved away from its original vision of providing an 'intelligent' search engine.

Alexa offered a toolbar to rank sites based on tracking information of users. Web users, who installed the Alexa Toolbar, provide statistical samples to Alexa where they surfing. From these samples Alexa computes the Alexa rank. Of course, it is not publicly known how the computation works. But one thing is sure: the smaller the better. A new site, about 1 visitor per week starts with the value 4 000 000 and the most visited site of the world has the value 1. This is Google (now)… Yahoo won the traffic rank 2. Typically if a site is in the top 100,000 that means that it’s enjoying a quite heavy traffic flow.

What Alexa says about the ranking method:

A site's ranking is based on a combined measure of reach and pageviews. Reach is determined by the number of unique Alexa users who visit a site on a given day. Pageviews are the total number of Alexa user URL requests for a site. However, multiple requests for the same URL on the same day by the same user are counted as a single pageview. The site with the highest combination of users and pageviews is ranked #1.

If a site is identified as a personal home page or blog, its traffic ranking will have an asterisk (*) next to it. Personal pages are ranked on the same scale as a regular domain.
For more details you can check Alexa’s help page.

Some issues:
  • Alexa's traffic rankings are for top level domains only.
  • Alexa ranking is heavily skewed towards websites which have a large webmaster/tech audience. This is because webmasters or web savvy audiences are much more likely to have the Alexa toolbar installed than websites whose visitors are unaware of Alexa.
  • It is easy to manipulate. Take a look: 20 quick way to increase alexa rank
Some related tools:

If you know more details about Alexa’s Ranking algorithm, please share with me!


Nisa said...

good posting

my one will coming top

seo service said...

Thinking about the PR and the Alexa ranking of a particular website are great ways to uplift your rankings. a website which has high Alexa and PageRank have higher selling rate than other sites which sell the same products. This is proven by many marketing surveys.