Features in depth

Everything your gigabytes deserve.

From the volume picker to the collector: every feature has one job — take space back without regrets.

✦ SwiftUI macOS 14+ Offline
01

A radial map, not a riddle

Every folder becomes a wedge. The bigger the hog, the bigger the slice. Click to dive in, center to climb back out.

02

An engine that thinks ahead

Measures true allocated size, de-duplicates hard links, and surfaces the largest files while the scan is still running — with live progress.

03

A collector with a safety net

Drag suspects into the Ready-to-Remove tray, review them at leisure, then move everything to the Trash in one step.

04

Private by design

Sandbox-safe, fully offline, zero telemetry. Folders it can't read are marked unknown — never silently hidden.

Under the hood

  • Measures allocated on-disk size, de-duplicates hard links
  • Live async scan with progress, prioritized large-file discovery
  • Interactive radial (sunburst) map — click to drill in, center to go up
  • Removal collector queues items, then moves them to Trash in one step
  • Quick Look inspector, Reveal in Finder, size-sorted file list
  • Sandbox-safe: security-scoped grants; denied folders shown as unknown, never silently skipped
  • Local disk scans stay on your Mac
STEP 01

Scan

Pick a volume or folder — NullDisk measures everything in seconds and streams the largest finds live.

STEP 02

Dive

Click through the rings to the culprit: ancient DMGs, forgotten Xcode archives, a doubled Downloads folder.

STEP 03

Reclaim

Queue it in the collector, double-check, Trash it. Done — with previews and Finder integration.

Frequently asked questions

Is NullDisk truly native to the Mac?

Yes — Swift and SwiftUI, for macOS 14 and up, on Apple Silicon and Intel. No Electron, no Java, no cross-platform compromise.

What happens to folders it can't access?

They're marked unknown with a lock — never shown as empty. The scan continues around them, so nothing is silently undercounted.

Does NullDisk delete immediately?

No. You collect first, then move everything to the Trash together — with confirmation. Only what you approve ever gets deleted.

Does NullDisk phone home?

Local scans stay on your Mac. Optional purchases and license recovery process your purchase email and order details; see the privacy policy.