Buying guide · 7 tools

Best visual disk analyzers: sunbursts, treemaps, and history

Choose a map that helps you connect size to a full path. Several products offer more than one view; a native UI or a particular chart does not by itself prove greater measurement accuracy.

Find your fit

NullDisk

Our product

NullDisk fits if you want a native Mac GUI with radial and treemap views, SSH/cloud sources, and Git-aware development cleanup. Its separate CLI adds terminal maps and JSON/NDJSON reports. All direct Mac features are free with reminders; the app sends anonymous usage telemetry.

Price
Direct Mac edition free with reminders; optional $9.99 one-time personal license or team seat removes reminders. App Store terms are separate.
Platform
Mac app: macOS 14+; CLI: macOS, Linux, Windows
Consider
Desktop GUI requires macOS 14+; Linux/Windows use the separate CLI
Explore features →

DaisyDisk

Sunburst navigation with Quick Look and collector actions.

Price
One-time license; free trial. Check vendor pricing and direct/App Store edition differences.
Platform
macOS
Consider
Mac app; no Windows or Linux desktop edition
Read product guide → Compare with NullDisk →

LumaDisk

Live sunburst and treemap plus duplicate and unused-file lists.

Price
Seven-day full trial; scanning stays free. Vendor lists $6.89 once for the remaining features.
Platform
macOS (Apple Silicon), Windows
Consider
Verify Mac CPU support; current site highlights Apple Silicon
Read product guide → Compare with NullDisk →

Disk Graph

Radial charts, treemaps, and animated snapshot sequences.

Price
Commercial app; check current developer and App Store purchase options.
Platform
macOS, iOS, iPadOS
Consider
Mobile scans cover locations accessible through Files
Read product guide → Compare with NullDisk →

How these tools were selected

Selections compare documented features and the job described in this guide. We did not run a common benchmark, assign performance scores, or audit every app’s code. Official sources appear under “Sources and how we compare.” Requirements and prices can change.

Common questions

Does NullDisk offer a treemap?

Yes. The Mac app lets you switch between radial and treemap views. The separate terminal UI also includes a treemap and folder list.

Do bigger shapes always mean more recoverable space?

They show the selected metric. Logical bytes, allocated bytes, file count, and provider-reported object sizes answer different questions; none guarantees immediate recovered capacity.

Can drawing a map affect performance?

Yes. Rendering large trees and retaining scan detail consume resources alongside filesystem I/O. Compare on your actual drive rather than assuming drawing is free.