In terms of market share, ReferLocal is clearly lagging behind, losing to Simple AdServer in all segments.
Simple AdServer has better usage coverage in more websites categories. Including Shopping, Web Hosting, Internet & Telecom, Software and 3 other categories.
ReferLocal is leading in Business & Industry, News & Media, Marketing & Advertising and Newspapers.
ReferLocal is leading in most countries, including United States and Italy.
Simple AdServer is leading in Hungary.