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Optimizely is leading in Top 10K Sites and The Entire Web.
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Yandex Verification is leading in Top 100K Sites and Top 1M Sites.
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Optimizely has better usage coverage in more websites categories. Including Vehicles, Finance, Science & Education, Community & Society and 8 other categories.
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Yandex Verification is leading in Games, Arts & Entertainment, Computers Electronics & Technology, Heavy Industry & Engineering and 8 other categories.
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Optimizely is leading in most countries, including United States, United Kingdom, Canada, Germany and 108 other countries.
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Yandex Verification is leading in Russia, Turkey, Ukraine, Belarus and 46 other countries.