I got Rank Tracker on App Sumo over a year ago and have since bought LTDs for a number of similar products such as Labrika, True Ranker, Dino Rank and a couple more. RT is hands-down the best of these. It may not yet be as versatile as the major players but it is on its way there. A lot has improved. There are a couple of minor quibbles but it has decent results and has proved very valuable to me. I am offering SEO services to smaller local businesses and RT is helping at keeping my prices attainable. It has better competitor comparison than the other tools, is the only one doing Bing as well and is simpler to navigate.
Ranktracker