UPDF is easy to use unlike other PDF readers that can be overwhelming with their features and options. It has a straightforward and intuitive interface. I like the UI design too.

Easy to use and fast to get stuff done. Program feels efficient and well optimized. Nice and userfriendly interface makes using the program a nice experience. Fast to use, for example, writing text and quickly changing the size of the text, it just takes a double click to start typing text, one click on the text to open its settings (colour, font, text size), and one click to increase/decrease font size by 2 points, or manually type in font size.

UPDF is easy to use with many options. I use it almost daily with rapid startup of selected pdfs. Have not found any problems with the app.