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, Nielsen NetRatings is clearly lagging behind, losing to Optimizely in all segments.

Websites Categories

1 Optimizely has better usage coverage in more websites categories. Including Computers Electronics & Technology, Business & Consumer Services, Health, Lifestyle and 19 other categories.

2 Nielsen NetRatings is leading in News & Media.

Geography

1 Optimizely is leading in most countries, including United States, Poland, United Kingdom, Ukraine and 184 other countries.

2 Nielsen NetRatings is leading in Italy, Venezuela, Faroe Islands, Saint Vincent and the Grenadines and 5 other countries.