Disk space analyzer for Mac, Windows and Linux

Know what fills your disk. Clear it in minutes.

DiskNinja scans your disk in seconds and draws it as one colourful chart. AI points out what you can safely remove, and you clean up without leaving the app.

Free to scan and clean · AI with Pro · macOS 13 or later · Apple Silicon and Intel
See everythingScans in seconds and shows every folder as a slice of one chart.
Let AI pickGet a list of what's safe to remove, and ask what anything is.
Clean up safelyMark what you want gone and move it all to the Trash at once.
DiskNinja Pro

Let AI find what you can delete.

No more hunting through folders. AI looks over your scan and picks out the candidates: old caches, forgotten backups, leftover simulators. You check the list and free up space in a minute.

See Pro pricing
Also in Pro

Not sure what something is? Ask.

Press ? next to any file or folder. AI tells you in plain words what it is and whether you still need it, so you never delete the wrong thing.

  • A plain answer for anything you don't recognise
  • File contents never leave your computer
See Pro pricing
Fast

Scans in seconds, not minutes.

DiskNinja reads your whole disk at once, and the chart fills in while it works. You can start exploring before the scan is done.

DiskNinja[N] sec
Finder, Get Info on the disk[N] min
[Test setup: which disk, how full, which computer]
Free, with no time limit

Everything you need to clear space.

3 items to remove11.9 GB Move to Trash
Only you decide what goes. Nothing moves until you confirm.

Clean up right from the chart

Mark what you want gone, check the list, then send it all to the Trash in one go.

System38.0 GB
⌘ + click to hide

Hide what you can't change

Take system folders out of the chart, so you only see what's yours to clean.

Macintosh HD562 GB used
Media SSD1.4 TB used
USB stick28 GB used

Every drive in one place

Your main disk, external drives and USB sticks, or any single folder.

English Español Deutsch 日本語 العربية + 9 more

Speaks your language

14 languages, including Arabic written right to left, with local number formats.

Macintosh HDUsersazatLibrary

Zoom in with one click

Click any slice to open that folder. The path at the top takes you back.

Free to use. Pro when you want AI.

Scanning and cleaning stay free forever. Pro adds AI suggestions and answers.

DiskNinja

Free Forever, on every platform
  • Scan any drive or folder
  • Chart, zoom and hide
  • Move to Trash
  • External drives and 14 languages
Download free

DiskNinja Pro

$14.99a year About $1.25 a month · save 37%
  • Everything in Free
  • Ask what any file or folder is
  • AI list of what's safe to remove
  • Cancel anytime
Secure checkout by Stripe. Your licence key appears right after checkout.

Got DiskNinja from the Mac App Store? You can also buy Pro inside the app with your Apple ID.

Download DiskNinja

We picked the right version for your computer. The others are below.

Download for macOS macOS 13 or later · Apple Silicon and Intel

Questions

Is DiskNinja really free?

Yes. Scanning, the chart, zooming, hiding and Move to Trash are free, with no time limit and no ads. Pro only adds the AI features.

What does Pro add?

AI that explains what a file or folder is when you press ?, and a short list of things that are usually safe to remove, biggest first.

How does the licence key work?

Right after checkout, the page shows your key and a button that opens DiskNinja and turns Pro on. You can also paste the key in Settings.

I use the Mac App Store version. Can I get Pro?

Yes. Buy Pro inside the app with your Apple ID, or buy it here and use the key in the app.

Is it safe to delete things?

DiskNinja moves items to the Trash or Recycle Bin, so you can put them back. Nothing is moved until you confirm.

How do I cancel Pro?

Use the link in your receipt email. Pro stays on until the end of the period you paid for.

Find out what's using your disk.

Download for macOS