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.
Native disk analysis for macOS
See what's eating your disk.
NullDisk measures your drive and paints every gigabyte as an interactive radial map. Dive in, round up the cruft, and send it to the Trash with one confident click.
For macOS 14+ · Apple Silicon & Intel · Zero data collection
surfaced248 GB
scan time31 s
Largest finds···
Xcode Archives~/Library/Developer · 214 items
48.2 GB Docker.raw~/.docker · 1 image
32.0 GB node_modules~/code · 37 projects
21.6 GB Why NullDisk
Cleanup that feels like magic.
No guesswork, no oceans of tables. One glance at the map — and you know exactly where your gigabytes live.
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.
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.
Private by design
Sandbox-safe, fully offline, zero telemetry. Folders it can't read are marked unknown — never silently hidden.
Effortless by design
Scan. Dive. Reclaim.
Three steps between you and a lean, breathing disk.
Scan
Pick a volume or folder — NullDisk measures everything in seconds and streams the largest finds live.
Dive
Click through the rings to the culprit: ancient DMGs, forgotten Xcode archives, a doubled Downloads folder.
Reclaim
Queue it in the collector, double-check, Trash it. Done — with previews and Finder integration.
The map
Your disk as a solar system.
The radial map draws ring upon ring: the drive at the core, every file in orbit. Stable colors, proportional angles — what you see is what's counted.
- Hover to highlight, click to dive, center to ascend
- Color swatches tie the file list to the map
- Quick Look, metadata, and Reveal in Finder built in
- Buttery motion that respects reduced-motion settings
The honest comparison
We measured all 24 rivals.
DaisyDisk, GrandPerspective, OmniDiskSweeper and the rest — every alternative evaluated honestly: strengths, weaknesses, and who it's actually for. Spoiler: for native Mac users with taste, the search ends here.
| NullDisk | DaisyDisk | GrandPerspective | OmniDiskSweeper | |
|---|---|---|---|---|
| Map | ◉ Sunburst | Sunburst | Treemap | List |
| Platform | macOS 14+ | macOS | macOS | macOS |
| Price | Paid | Paid | Open source | Free |
| Offline | ✦ | ✦ | ✦ | ✦ |
Questions
Good to know.
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?
No. It works fully offline and collects zero data — as stated in its App Store privacy declaration.
Reclaim your space
Your disk breathes again.
Download NullDisk, scan your drive, and find your first 10 gigabytes in under a minute. The download is small — the effect isn't.