Gemius
108,205 websites

Gemius offers both free and paid options

http://www.gemius.com/

Gemius SA is the largest online research agency in Central and Eastern Europe.

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Quantcast
274,085 websites

Quantcast is free to use

http://www.quantcast.com/

Quantcast helps advertisers and publishers better understand, find and access targeted audiences in real-time. Marketers use Quantcast to amplify their targeting and reach consumers who look just like their best performing customers with un...

Market Share by Top Websites

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

2 In terms of market share, Gemius is clearly lagging behind, losing to Quantcast in all segments.

Websites Categories

1 Quantcast has better usage coverage in more websites categories. Including Arts & Entertainment, Games, Science & Education, Computers Electronics & Technology and 17 other categories.

2 Gemius is leading in News & Media, Vehicles and E-commerce & Shopping.

Geography

1 Quantcast is leading in most countries, including United States, United Kingdom, Japan, France and 143 other countries.

2 Gemius is leading in Russia, Poland, Hungary, Czech Republic and 12 other countries.