Market Share by Top Websites

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

2 Despite its recent growth, AdReactor is still behind Mediaplex in all market share segments.

Websites Categories

1 Mediaplex has better usage coverage in more websites categories. Including Arts & Entertainment, People & Society, Business & Industry, Shopping and 213 other categories.

2 AdReactor hasn't got a lead over Mediaplex in any websites category.


1 Mediaplex is leading in most countries, including United States, United Kingdom, Germany, France and 122 other countries.

2 AdReactor is leading in Indonesia, Egypt, Zimbabwe, Cuba and 3 other countries.