A disk space analyzer for the Mac

Your disk, audited.

Diskist measures a disk or a folder, draws it as a ring map and lists every item beside it, largest first. Nothing leaves the disk until you press the Collector's button.

Try the sample

ClickTap a ring to look inside. ClickTap the center to go up.
Collect what you would remove, then press Move to Trash.
↑↓ move↩ look inside⌘↑ go up⌘⌫ collect

$8, once. Coming to the Mac App Store. Tell me when it is out

Sample disk · invented folders

Macintosh HD · 494 GB

Used 467 GB Free 27.4 GB

tim

354 GB in 62,505 files

Kept
Kept
Kept
Kept
Kept
Kept
Kept
Kept

CollectorDrag an item here, or press Collect. Nothing is removed until you say so.

How it counts

Counted once, on the disk.

A map is only useful if its numbers are honest. Here is how Diskist counts.

How Diskist counts each kind of item
Item	How it is counted	Entry
A file	The bytes it takes on the disk, not the length it reports.	On disk
A hard-linked file	Once, however many folders hold it.	Once
A cloud-only file	Left closed. A scan does not download it to measure it.	Not downloaded
Another disk	A scan stays on the disk it started on. A scan of the startup disk covers its Data volume.	Not crossed
Items too thin to see	Drawn together as one arc of smaller items. The list beside the map shows every one.	Grouped
Units	Like Finder, a gigabyte is a billion bytes. A setting switches to binary units.	GB or GiB
The whole map	Everything a scan could read, plus one gray arc for the rest.	The disk

Hidden space

Reported, not guessed.

Mail, Messages, Safari and other apps' data are private to macOS. Diskist cannot read them, so it counts them together as one gray arc, hidden space, and says how much it holds.

Desktop, Documents and Downloads each ask once, the first time a scan reaches them. That is macOS, and Allow counts them. Without Full Disk Access, a scan leaves closed the folders that would make macOS ask about Photos, Apple Music, Contacts or Calendar.

Snapshots and the other volumes of a disk stay hidden space. No app from the App Store can open them.

The sample disk above

446 GB read and drawn, 21.3 GB hidden space.

To see more: one switch

Open Diskist's Settings, then Access.
Click Open System Settings.
Turn on the switch beside Diskist.
Quit Diskist, open it, and scan again.

The Collector

Nothing leaves until you say so.

Collect
Drag an item to the Collector, or press ⌘⌫. It leaves the map. Nothing on the disk changes.
Look it over
The Collector lists each item and where it lives. Put Back returns any of them.
Press Move to Trash
A countdown runs first, with Cancel. It starts at five seconds.
The Trash
Items go to the Trash, so you can still change your mind. Deleting at once is a setting.

Cleanup Log Every scan and everything you remove is written to the log.

Kept Diskist does not offer to remove macOS or the folders a Mac needs.

An item

Every item has its keys.

The Item menu, with its shortcuts. Right-click anything for Copy Path and the rest.

Look Inside↩
Quick LookSpace
Show in Finder⌘↩
Add to Collector⌘⌫
Enclosing Folder⌘↑
Next Item, Previous Item↓↑
Scan Folder⌘O
Rescan⌘R
Cleanup Log⌘L

Scan a disk from the list of disks, or drop a folder on the window. Several scans can run at once.

On your Mac

It stays on your Mac.

Sandbox: Diskist runs in the App Sandbox. It reads only the disks and folders you choose, and remembers that choice.
Network: None. The app has no network access. Nothing it measures is sent anywhere.
Account: None to make. Open it and scan.
Updates: Through the Mac App Store.

The account

$8, once.

Planned price: $8, paid once. No subscription.
Where: The Mac App Store.
Needs: macOS 15 or later.
Status: In the works. Not out yet.