AppNexus
1,380,787 websites

AppNexus offers both free and paid options

http://www.appnexus.com

AppNexus is the most advanced platform for buying real-time online advertising. AppNexus's clients include the largest ad networks and online advertisers. AppNexus offers a proprietary gateway to premier ad exchanges and ad inventory aggreg...

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PubMatic
2,250,358 websites

PubMatic is free to use

http://www.pubmatic.com

Since 2006, PubMatic (www.PubMatic.com) has been at the forefront of developing innovative technology to help publishers automate the process of evaluating and selling their advertising inventory. PubMatic gives premium publishers a real-ti...

Market Share by Top Websites

1 PubMatic is leading in Top 1M Sites and The Entire Web.

2 AppNexus is leading in Top 10K Sites and Top 100K Sites.

Websites Categories

1 PubMatic has better usage coverage in more websites categories. Including Arts & Entertainment, Computers Electronics & Technology, Science & Education, Games and 20 other categories.

2 AppNexus hasn't got a lead over PubMatic in any websites category.

Geography

1 PubMatic is leading in most countries, including United States, Japan, China, Russia and 161 other countries.

2 AppNexus hasn't got a lead over PubMatic in any country.