ADirStat is a treemap visualisation tool for Android storage usage developed by FlightOfStairs. It is a free program that provides a similar view to KDirStat for Linux and WinDirStat for Windows. With ADirStat, users can easily identify large files and directories, even if they are deep in subdirectories. This makes it easy to delete or inspect unneeded files, freeing up space on your device.

The treemap view is easy to understand and provides a clear visual representation of how storage space is being used. The program is simple to use, and users can quickly navigate through the different levels of directories to find the files they need. ADirStat is published under the MIT license, and the code can be found on GitHub for those interested in contributing or making modifications.