In terms of market share, Open AdExchange is clearly lagging behind, losing to zapunited in all segments.
zapunited has better usage coverage in more websites categories. Including Arts & Entertainment, Adult, People & Society, Software and 12 other categories.
Open AdExchange is leading in Business & Industry, Law & Government, Newspapers, Marketing & Advertising and 8 other categories.
zapunited is leading in most countries, including India, Australia, Russia, Indonesia and 16 other countries.
Open AdExchange is leading in Denmark, Norway, Sweden and Turkey.