Rank Tracker is an amazing SEO tool with a professional interface!
I recommend it without a doubt, it is a universal solution for every webmasters and Internet marketeer.

What I like:

- I find technical problems on any site. Everything is delineated in great detail. I easily switch to any error. I study it, and then correct it.
- it shows me what helps my competitors to be in the top of search engines.
- Change the information on your site following the recommendations.
- Powerful reports

Extra Bonus the desktop application

What can I say? This is an excellent and effective tool!