SerpBook‘s powerful rank tracker that enables you to quickly gather keyword rankings and share them with all of your clients. You and your clients can access your keyword rankings from any device with internet access.
100% Accurate and Reliable GOOGLE + BING + YAHOO Rank Tracker
Google Page Rank, and Backlinks updated daily.
Clean & Modern Interface
Sophisticated Charts and Powerful Notes
Whitelabel PDF and Excel Reports
Share or iFrame your data for your clients to see, anywhere they are.
The pricing is set at a monthly rate and starts as low as $4.95 and also a free trial period which include 10 keywords. The price moves up for each amount of keywords that you would need 25,50, 100 etc.
This is great web based rank tracking tool with lots of features. You can start your free trail before paying. (No credit card required)