WordPress Stats
11,448 websites

WordPress Stats is free to use

http://en.support.wordpress.com/stats/

WordPress.com Stats lets you know how many visits your site gets, and what posts and pages are most popular.

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YellowTracker
17 websites

YellowTracker is free to use

http://www2.yellowtracker.com/aspx/login.aspx

Web site traffic analysis software for measuring visitor behaviour, tracking online advertising campaigns and creating detailed web site statistics reports based ...

Market Share by Top Websites

1 WordPress Stats is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.

2 In terms of market share, YellowTracker is clearly lagging behind, losing to WordPress Stats in all segments.

Websites Categories

1 WordPress Stats has better usage coverage in more websites categories. Including Science & Education, Computers Electronics & Technology, Community & Society, Arts & Entertainment and 20 other categories.

2 YellowTracker hasn't got a lead over WordPress Stats in any websites category.

Geography

1 WordPress Stats is leading in most countries, including United States, Japan, United Kingdom, Canada and 117 other countries.

2 YellowTracker hasn't got a lead over WordPress Stats in any country.