A good PDF manager

I have many PDF files for my work, I usually set many folders to distinguish them. But sometimes it is really difficult to operate. My ferried jokingly said that I need a manager. Why not? Maybe there are many people having the same problem and developers also found this business opportunity. As expected, I found many applications having this function in Mac App Store. Tell you the truth, I chose this app by my feeling. But I was luck, I made a right choice. I can import all of PDF files to it, and I can break them into categorize. Of course, there are 5 colors I can use to recognize my PDF files. With this app, I neednt worry this problem anymore. Whats more, this app seemingly supports more functions, but I didnt use them up to now. Maybe I will use them in the future and I believe that they will the same useful.

WilliamRiley435 about PDF Manager Ultimate