Fathom SEO
5 websites

Fathom SEO offers both free and paid options

http://www.fathomseo.com/

Search engine optimization firm offering pay-per-click, link building and web analytics. Cleveland, Ohio.

VS

Nextag ROI Optimizer
3 websites

Nextag ROI Optimizer is free to use

http://nextagsellers.blogspot.com/2010/02/roi-optimizer.html

2 Feb 2010 ... The ROI Optimizer is one of the most important features that you can implement to understand the performance of your account. What is it?

Market Share by Top Websites

2 In terms of market share, Fathom SEO is clearly lagging behind, losing to Nextag ROI Optimizer in all segments.

Websites Categories

1 Fathom SEO has better usage coverage in more websites categories. Including Business & Consumer Services and Computers Electronics & Technology.

2 Nextag ROI Optimizer hasn't got a lead over Fathom SEO in any websites category.

Geography

1 Fathom SEO is leading in most countries, including Germany, South Korea and Egypt.

2 Nextag ROI Optimizer is leading in United States.