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Optimizely is leading in Top 100K Sites, Top 1M Sites and The Entire Web.
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ChartBeat is leading in Top 10K Sites.
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Optimizely has better usage coverage in more websites categories. Including Games, Arts & Entertainment, Computers Electronics & Technology, Vehicles and 19 other categories.
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ChartBeat is leading in News & Media.
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Optimizely is leading in most countries, including United States, United Kingdom, Canada, Germany and 159 other countries.
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ChartBeat is leading in Tajikistan and Afghanistan.