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Google Website Optimizer is leading in The Entire Web.
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Convertize is leading in Top 100K Sites and Top 1M Sites.
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Google Website Optimizer has better usage coverage in more websites categories. Including Games, Community & Society, Science & Education, Pets & Animals and 17 other categories.
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Convertize is leading in Business & Consumer Services, Lifestyle and Home & Garden.
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Google Website Optimizer is leading in most countries, including United States, Canada, Russia, Australia and 65 other countries.
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Convertize is leading in France, United Kingdom, Netherlands, Chile and 10 other countries.