In terms of market share, eProof is clearly lagging behind, losing to Marktest in all segments.
Marktest has better usage coverage in more websites categories. Including People & Society, Arts & Entertainment, Music & Audio, Newspapers and 5 other categories.
eProof is leading in News & Media, Finance and Accounting.
Marktest is leading in most countries, including Portugal, Brazil and France.
eProof is leading in United States.