This app shows the whole filesystem tree (starting from /storage) as a compact sunburst diagram. The size of the sectors in the diagram corresponds to the disk space that is occupied by the files in this subdirectory tree. You can identify folders hidden anywhere in the filesystem tree that waste big parts of the sdcard disk space. The tool can remind you of some space consuming temporary files that you (or other apps) forgot to remove. Make room for new important files on your android device!
You can load the app from the Google play store.