Observer
2 websites

Observer is free to use

http://observerapp.com/

Observer is a web analytic tool developed by Ludwig Pettersson. Observer also includes a toolbar that lets you view your analytics no matter what site you are on.

VS

VisitorVille
16 websites

VisitorVille costs money

http://www.visitorville.com/

View your web site visitors as animated characters in a virtual city.

Market Share by Top Websites

2 In terms of market share, Observer is clearly lagging behind, losing to VisitorVille in all segments.

Websites Categories

1 VisitorVille has better usage coverage in more websites categories. Including E-commerce & Shopping, Health, Arts & Entertainment, Heavy Industry & Engineering and one other category.

2 Observer hasn't got a lead over VisitorVille in any websites category.

Geography

1 VisitorVille is leading in most countries, including United States, United Kingdom, Canada and France.

2 Observer is leading in Russia.