# Disk space analyzer for Linux/Ubuntu with extra cool features

I know that quite a few not bad disk space analyzers for Linux/Ubuntu already exist. However, I've kinda "fallen in love" with SpaceSniffer on Windows. Thus I'm interested if there's a tool which would have "that extra polish" on Linux/Ubuntu. A quick intro screenshot to give a general idea about how every tool like this that I've seen usually looks like, more or less:

Ok, so that was the fluff, now let's get rough and coldly spec out my fancies:

• Must work on Ubuntu. Support for other Linux distros will be "looked upon well". More supported OSes/platforms are cool, but not required here.
• Must be at least gratis (freeware). Strong preference for libre or at least open-source, but closed source is grudgingly acceptable for me here, as long as I don't pay. But must not send any data over the network; please, no spyware, I can't even imagine how network could be any value here.
• Strongly prefer a GUI app. TUI (i.e. curses-based/...) are not excluded, but I don't believe they would do it for me. Quickly hovering over stuff with a mouse and exploring by clicking is super powerful here. Purely CLI batch-mode stuff (e.g. df) is not accepted; must be interactive.
• Must show disk usage by directories/files as "squares/rectangles", also show the name and actual size per directory/file at least when hovering the mouse over the rectangle, and must easily allow retrieving the whole path to the dir/file. [This is mostly a generic/baseline requirement for this kind of a tool.]
• Must allow some reasonable drill-down.
• Must be able to choose at least the initial mount point ("disk") to scan. Ideally, it'd show a list of mount points to choose from, but also allow specifying any custom path to a directory.
• Should be able to work in sudo mode and in non-sudo mode. Should display some info whether it is in sudo mode or in limited non-root mode.
• Should handle inaccessible paths in some reasonable way. At least not crash/hang on them. Ideally, show them as "inaccessible space" on the graph (size could probably be deduced by subtracting total space - free space = inaccessible space).

Now, the "extra features" I like in SpaceSniffer, which I'd like to see in a Linux tool; please note it MUST have at least one of those; otherwise I'm no better than with what I already use:

• Should start drawing the rectangles immediately after starting, and update the graph "live" as it is scanning the disk for the first time. (Most of the tools I've seen show "loading", and draw the grid only after they finished scanning.)
• Should be able to display a rectangle for "free space" and for "unscanned (yet) space". This second feature (unscanned space) works especially well in a combo with the previous ("live/early drawing") feature.
• Should dynamically update the graph when files on disk are changing (i.e. use a feature like "inotify"). For example, if I delete a file on disk, I should see the graph update rather quickly afterwards to show the new situation.

Any suggestions?

• "what I already use" — What do you already use? – Kodiologist May 17 '18 at 19:12