Freedom251 › Disk Space Analyzers
DiskMapper
by DiskMapper
What DiskMapper is
DiskMapper is a free macOS application that maps storage on a Mac, an external drive, or a selected folder. It covers files, folders, and applications, then displays usage as a sunburst or treemap with instant switching. Users can drill into folders, move backward or forward, and keep map highlights synchronized with the file list. The Biggest Files panel lists the 200 largest items on a volume with relative paths. A System Junk panel identifies caches, old diagnostic reports, app leftovers, and stale DerivedData, with confidence levels. Selected items can be sent to Trash, have iCloud downloads evicted, or be moved or copied elsewhere. The app has no accounts or telemetry; settings, favorite folders, and scan history remain local, and it reads names, sizes, dates, and folder structure rather than file contents. Full Disk Access is required. The signed, notarized download targets Apple silicon Macs running macOS 26 Tahoe or later. DiskMapper is donationware, with no paid features locked behind a paywall.
Who it suits
It suits Mac users who want visual storage analysis across internal disks, external drives, or folders and want cleanup actions for selected items. It is specifically listed for Apple silicon Macs running macOS 26 Tahoe or later.
What it does well
- Sunburst and treemap views switch instantly
- Scans external drives and selected folders
- Lists the 200 largest volume items
- Identifies several types of system junk
- No accounts or telemetry
What to know first
- Requires Full Disk Access
- Apple silicon and macOS 26 Tahoe or later
- No duplicate finder
- No app-uninstall feature
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Free donationware; optional donations are voluntary and nothing is locked behind a paywall. · Sunburst and treemap visualizations · External-drive and folder scanning · Biggest Files and System Junk panels · Cleanup actions for selected files | Free |
| Donationware | Nothing is locked behind a paywall · optional donation | Free |
As diskmapper.app lists them, read 22 Sept 2026. The maker's own page has the final word.
Verdict
DiskMapper combines visual disk mapping with targeted cleanup and local data handling. Its platform requirement and missing duplicate-finder and uninstall tools define the limits of its focused scope.
Facts from DiskMapper's own pages
- Application sizes
- Yes · diskmapper.app, 22 Sept 2026
- Cleanup
- Users can select items to move to Trash, evict iCloud downloads, or move or copy elsewhere. · diskmapper.app, 11 Oct 2026
- Distribution
- DiskMapper is a direct, signed and notarized download; the maker says it is not on the Mac App Store because sandboxing prevents the access and file management it needs. · diskmapper.app, 11 Oct 2026
- External drive scans
- Yes · diskmapper.app, 22 Sept 2026
- Free plan
- Yes · diskmapper.app, 22 Sept 2026
- Headquarters
- Canada · diskmapper.app, 28 Sept 2026
- Largest items
- The Biggest Files panel shows the 200 largest items on a volume with their relative paths. · diskmapper.app, 11 Oct 2026
- Limits
- DiskMapper does not include a duplicate finder or app-uninstall feature. · diskmapper.app, 11 Oct 2026
- Local data
- Settings, favorite folders, and scan history are stored locally, and the app reads file names, sizes, dates, and folder structure rather than file contents. · diskmapper.app, 11 Oct 2026
- Maker
- The site identifies Brad Macdonald as the independent maker and says DiskMapper is made in Canada. · diskmapper.app, 11 Oct 2026
- Navigation
- Users can drill into folders, navigate back and forward, and see synchronized highlights between the map and file list. · diskmapper.app, 11 Oct 2026
- Permission
- DiskMapper requires Full Disk Access to see and manage files across the Mac, and flags sources without access. · diskmapper.app, 11 Oct 2026
- Platform
- The download is for Apple silicon Macs running macOS 26 Tahoe or later. · diskmapper.app, 11 Oct 2026
- Desktop platforms
- macos · diskmapper.app, 22 Sept 2026
- Privacy
- The app has no accounts or telemetry; its routine network connection is a daily update check that sends only the app version and can be disabled. · diskmapper.app, 11 Oct 2026
- Purpose
- DiskMapper analyzes disk space on a Mac by mapping a whole disk, external drive, or folder. · diskmapper.app, 11 Oct 2026
- Scan scope
- files_folders_apps · diskmapper.app, 22 Sept 2026
- Support
- The maker invites public beta reports by email at [email protected]. · diskmapper.app, 11 Oct 2026
- System junk
- The System Junk panel identifies items such as caches, old diagnostic reports, app leftovers, and stale DerivedData, with confidence levels. · diskmapper.app, 11 Oct 2026
- Treemap view
- Yes · diskmapper.app, 22 Sept 2026
- Visualizations
- It displays disk contents as a sunburst or treemap, with instant switching between the two views. · diskmapper.app, 11 Oct 2026
Where DiskMapper stands on Freedom251
- Disk Space Analyzers#73 of 105