Your disk, mapped.
A native disk-space analyzer for Mac. Scan your whole disk, an external drive, or any folder — see exactly what's taking up space as a colorful map you can drill straight into.
Free, no accountNo telemetryNot affiliated with Apple
Sunburst view of a real scan — an external SSD, 25.71 GB
See what's using space — then do something about it.
Six capabilities, all shipped in v1.1 — nothing here is a promise for later.
Two visualizations
Instant switch between a sunburst and a treemap with ⌘1/⌘2 — no rescan, same data, two ways to see it.
Full navigation
Double-click to drill in, browser-style back/forward (including mouse buttons 4/5), and hover highlights that sync between the map and the file list.
Biggest Files panel
The largest items on the whole volume, with relative paths, so the worst offenders are never buried three folders deep.
System Junk panel
Caches, old diagnostic reports, orphaned app leftovers, and stale DerivedData — classified with confidence levels; high-confidence items are pre-added for you.
Cleanup list
Cross-view checkbox selection with running totals that honestly exclude cloud placeholders. Move to Trash, evict iCloud downloads, or Move/Copy to elsewhere.
Permission-honest UX
Clear onboarding for Full Disk Access, and an orange "No access" warning per source instead of silently showing zero.
Nothing about your disk leaves your Mac.
- No account, ever
- No telemetry
- No network calls in normal use
| What leaves your Mac | |
|---|---|
| Coffee link | Only if you click it — opens your browser |
| Everything else | Never leaves your Mac |
Coming soon.
DiskMapper v1.1 is feature-complete and being tested. It's a direct download, not on the Mac App Store — Full Disk Access and broad file management aren't something the sandboxed App Store environment supports well.
The current build is signed but not yet notarized — Apple Developer Program enrollment is pending validation. Downloads land here once that clears. No date promised yet — check back.
Questions worth answering plainly.
Do you make other apps?
Yes — BackupTempo, a native macOS menu-bar app that takes control of when Time Machine backs up: custom intervals, scheduled times, blackout windows.
Is this made by Apple?
No. DiskMapper is an independent app, made in Canada by Brad Macdonald. Not affiliated with Apple.
Is DiskMapper free?
Yes — donationware. Nothing is locked behind a paywall. If you find it useful, there's an optional "Buy Me a Coffee" link.
Does it need special permissions?
Full Disk Access, so it can see and manage files across your whole Mac. Onboarding walks you through granting it, and any source you don't grant access to shows a clear orange "No access" warning instead of silently reporting zero.
Does it send any data anywhere?
No account, no telemetry, no network calls in normal use. The only exception anywhere in the app is clicking the coffee link, which opens your browser.
What happens to my iCloud files?
Cloud placeholders and downloaded files are badged and handled correctly. Evicting a placeholder frees space without deleting the file from iCloud.
Is this a duplicate finder or an uninstaller?
No. DiskMapper is a disk-space map with a Biggest Files panel and a System Junk detector — no dedupe engine, no app-uninstall feature.
Which macOS versions does it support?
macOS 26 Tahoe and later.
Why isn't it on the Mac App Store?
Sandboxing doesn't allow the Full Disk Access and file-management this app needs. It ships as a direct, signed download instead.
When will a notarized build be available?
Soon — Apple Developer Program enrollment is pending validation. No date promised yet; check back.