Trendle

is the all-in-one Amazon PPC management software that looks to help Amazon sellers grow their business in profitable ways. With Trendle, you’ll benefit from several of their key features, including automatic emails to your customers, review alerts to let you know when a good review comes in, great analytics that you can view in easy graphs, and a keyword ranking system; which will let you know which of your keywords is doing amazingly. Trendle offers a 30-day free trial, and their services are only $50 a month.