Nodescope is a free Android app developed by CHUR that allows you to visualize the contents of your USB storage in a tree-like structure. Each box in the tree represents a folder or file, with its size and color indicating the disk usage. The contents of each folder are displayed underneath the box, enabling you to drill down into the hierarchy.

The app provides an intuitive user interface that allows you to navigate around the tree easily. You can zoom in on any box by tapping on it or use swipe and pinch gestures to move around. The children of each folder are arranged from biggest to smallest, left to right. If any children aren't large enough to display, they are grouped together into a gray box that can be expanded by zooming in or tapping on it.

Nodescope is also available for Windows, and the framework supports various other kinds of trees. The app is a useful tool for users who want to see what's taking up space on their storage and how it's being used.