GrandPerspective app icon

GrandPerspective

Shows what fills your disk as a map of blocks

MacFree, open source

The verdict

Free from SourceForge or $2.99 on the Mac App Store, this open source app draws your whole disk as a map of blocks sized by how much space each file takes, so the biggest space hogs stand out at once. The $2.99 only buys automatic updates, which makes the free download the cheapest way in. The current version needs macOS 14 or later, with older builds linked on the same page.

The Useful TechResearched and written with AI under our rulesUpdated 14 Oct 2026

Get it if

Your Mac keeps warning the disk is nearly full and the Storage page won't tell you which files to blame.

Skip it if

You just want a rough split between apps, photos and documents, which System Settings shows under Storage.

Screenshots 3

What it helps you do

  • Find the biggest files on your disk
  • See which folders take the most space
  • Spot forgotten downloads and old videos

Plans and prices

  • SourceForge download

    Free

    Free and open source under the GNU GPL

  • Mac App Store

    $2.99

    $2.99, the same app with automatic updates

What changed

  1. Version 3.8.1

    Improvements: · Improved viewing of logs for diagnostic purposes · The size upperbound when coloring by size now depends on the Display settings · Added keyboard shortcut for Show/Hide Control Panel Fixes: · Fixed type conformance declaration for GrandPerspective scan dumps Code improvements: · Increased deployment target to macOS 14.0 and updated code accordingly

  2. Added to The Useful Apps

Pick something else if

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The details

Runs on
Mac
Requires
macOS 14.0 or later
Version
3.8.1
Size
3 MB
Made by
Erwin Bonsma
Open source
Code is public
Privacy
Collects no data, per its App Store label
Family Sharing
1 purchase for the family

Developer's websiteSpot a wrong price or fact?