Market Share by Top Websites

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

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

Websites Categories

1 Quantcast has better usage coverage in more websites categories. Including Arts & Entertainment, Games, Science & Education, Computers Electronics & Technology and 16 other categories.

2 Optimizely is leading in Vehicles, Finance, Business & Consumer Services and Jobs & Career.


1 Quantcast is leading in most countries, including United States, United Kingdom, Japan, France and 153 other countries.

2 Optimizely is leading in New Zealand, Austria, Cameroon, French Polynesia and 2 other countries.