Polar
470 websites

Polar is free to use

http://polar.me

MediaVoice is used by top publishers around the world to serve native advertising and sponsored content to their readers as they would the rest of their stories, while serving and tracking these stories like any other ad.

VS

Zemanta
2,452 websites

Zemanta is free to use

http://www.zemanta.com

Zemanta recommends your content to a diverse network of engaged communities around the web, bringing new readers to your site.

Market Share by Top Websites

1 Zemanta is leading in The Entire Web.

2 Polar is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.

Websites Categories

1 Zemanta has better usage coverage in more websites categories. Including Computers Electronics & Technology, Community & Society, Science & Education, Arts & Entertainment and 19 other categories.

2 Polar is leading in News & Media.

Geography

1 Zemanta is leading in most countries, including United States, India, Canada, Spain and 90 other countries.

2 Polar is leading in United Kingdom, Lebanon and Qatar.