ROI trax
4 websites

ROI trax is free to use

http://www.oneupweb.com/oneupweb_glossary/roi_trax/

Oneupweb®’s proprietary ROI trax® technology was designed to help marketers measure performance of online marketing right down to which keywords bring in the most customers; landing-page effectiveness, position reporting, competitor monitor...

VS

SexTracker
165 websites

SexTracker is free to use

http://www.sextracker.com/

The SexTracker: The #1 Adult Site Guide! Adult Links, All Adult Search Engine, Webmaster Site Stats!

Market Share by Top Websites

1 SexTracker is leading in Top 1M Sites.

2 In terms of market share, ROI trax is clearly lagging behind, losing to SexTracker in all segments.

Websites Categories

1 ROI trax has better usage coverage in more websites categories. Including Computers Electronics & Technology, Health and Home & Garden.

2 SexTracker is leading in Adult and Arts & Entertainment.

Geography

1 SexTracker is leading in most countries, including United States, Germany, China, France and 26 other countries.

2 ROI trax hasn't got a lead over SexTracker in any country.