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 Autos & Vehicles, Adult, Web Hosting, Internet & Telecom and one other category.
ReferLocal is leading in Business & Industry, People & Society and News & Media.
ReferLocal is leading in most countries, including United States and Bulgaria.
Simple AdServer is leading in Hungary.