Disk Inventory X on a current Mac, and what to use instead

Disk Inventory X is the Mac treemap a lot of people remember from a Windows habit, because its layout comes from the same family as WinDirStat. If you have gone looking for it again, the question is not whether it is good. It is whether it runs on the Mac in front of you.

What Intel only means in practice

The last release predates Apple silicon by about a year, so on any M series Mac it is a translated Intel app rather than a native one. That has three consequences worth knowing before you download it:

• It needs Rosetta. If Rosetta is not installed yet, the first launch asks to install it. That is a one time prompt, not a fault.
• Translation is not free. Walking a large drive is exactly the kind of work that gets slower under translation, and the machines that need a disk map are usually the full ones.
• Nothing about it will be fixed. The newest macOS its own page names is Catalina, from 2019. Every macOS since then has changed how volumes, snapshots and privacy permissions work, and a 2019 build cannot know about any of it.

None of that makes it dangerous. It reads the disk and draws a picture. It just means what it draws can be wrong in ways that did not exist when it was written, and the most common one is on the next line.

The thing a 2019 tool gets wrong on a current Mac

Since Catalina, the system lives on a separate read only volume in the same container as your data, and Time Machine keeps local snapshots on the internal disk. A tool that walks folders sees neither correctly. That is why an old treemap can add up to far less than the drive says is used, and the gap is not a bug in the arithmetic. It is purgeable space and snapshots, which are counted somewhere the walk never goes.

If the number in the treemap and the number in System Settings disagree by tens of gigabytes, that difference is real and it has an explanation that has nothing to do with which tool you used.

The alternatives, and what each one is for

For a straight swap, GrandPerspective is the answer: same treemap idea, same free price, still being released. The one catch is that its current version needs macOS 14 or later, so on an older Mac you want one of its older builds. If you would rather see a column of exact numbers than a picture, OmniDiskSweeper is the other direction to go.

Before you install anything at all

A treemap is a picture of an answer you can get in one line. Run this first, because it takes ten seconds and often ends the search:

du -xh -d 1 ~ 2>/dev/null | sort -h | tail -20

Biggest last. Point it at whatever it names, one level at a time, and you have done by hand what every tool on this page automates. Install one when you want the picture, the drill down, or the parts of the disk outside your home folder.