AdBrite
700 websites

AdBrite is free to use

http://adbrite.com

AdBrite labels itself as the internet's ad marketplace. It provides interstitials and banner ads on a cost per mille (thousand) basis, and text ads on either cost per click or cost per action.

VS

C3 Metrics
227 websites

C3 Metrics costs money

http://www.c3metrics.com

C3 Metrics’ Intellectual Property and SaaS platform solves difficult problems in a changing market. C3 Metrics’ IP is the first of its kind to detect viewable impressions through cross-domain iFrames while seamlessly connected to the mos...

Market Share by Top Websites

1 AdBrite is leading in The Entire Web.

2 C3 Metrics is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.

Websites Categories

1 AdBrite has better usage coverage in more websites categories. Including Computers Electronics & Technology, Arts & Entertainment, Adult, Science & Education and 11 other categories.

2 C3 Metrics is leading in Finance, Food & Drink, Travel & Tourism, Business & Consumer Services and 2 other categories.

Geography

1 AdBrite is leading in most countries, including United States, India, United Kingdom, Philippines and 68 other countries.

2 C3 Metrics is leading in Georgia, Hungary, Belarus and Cyprus.