ClustrMaps
8,900 websites

ClustrMaps is free to use

http://www.clustrmaps.com/

ClustrMaps is a compact visitor tracker, designed for general web and blog use. They give you an easy way to show off your visitor locations.

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Nielsen NetRatings
52,101 websites

Nielsen NetRatings costs money

http://nielsen.com

Nielsen is a leading global provider of information and insights into what consumers watch and buy. Nielsen is a information and measurement company with leading market positions in marketing and consumer information, television and othe...

Market Share by Top Websites

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

2 In terms of market share, ClustrMaps is clearly lagging behind, losing to Nielsen NetRatings in all segments.

Websites Categories

1 Nielsen NetRatings has better usage coverage in more websites categories. Including Games, Arts & Entertainment, News & Media, Sports and 19 other categories.

2 ClustrMaps is leading in Science & Education.

Geography

1 Nielsen NetRatings is leading in most countries, including United States, Italy, Australia, United Kingdom and 142 other countries.

2 ClustrMaps is leading in South Korea, Kyrgyzstan, Malawi, Martinique and 3 other countries.