Market Share by Top Websites

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

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

Websites Categories

1 Optimizely has better usage coverage in more websites categories. Including Games, Arts & Entertainment, Computers Electronics & Technology, Finance and 10 other categories.

2 Gemius is leading in News & Media, Vehicles, E-commerce & Shopping, Health and 6 other categories.


1 Optimizely is leading in most countries, including United States, United Kingdom, Canada, Germany and 136 other countries.

2 Gemius is leading in Russia, Poland, Hungary, Czech Republic and 20 other countries.