Best free disk analyzers: what is included

Reviewed 3 November 2026Published by NullDisk

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Sources and how we compare

We publish NullDisk, one of the products covered here. These guides draw on official documentation; we have not run a comparative performance benchmark. Recommendations describe who each tool suits, and list order is not a test score.

Prices reflect vendor or US store terms at review and can vary by region, tax, and edition. “Not verified” means the documentation did not establish a feature, rather than that the app lacks it.

NullDiskfeatures ↗ · cli ↗ · pricing ↗ · privacy ↗
GrandPerspectiveOfficial documentation ↗
SquirrelDiskOfficial documentation ↗ · Source repository ↗
OmniDiskSweeperOfficial documentation ↗
DiskarooOfficial documentation ↗
diCleanerOfficial documentation ↗ · App Store listing ↗
Disk Inventory XOfficial documentation ↗ · Official documentation ↗

NullDisk: features · CLI · pricing · privacy and telemetry.

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 →

GrandPerspective

Free SourceForge build with scan saving, text/image exports, and file actions.

Price: Free from SourceForge; the same app is $2.99 in the US App Store.
Platform: macOS 14+ (current release)
Consider: Treemap rather than radial navigation

Read product guide → Compare with NullDisk →

SquirrelDisk

Free open-source GUI with maps, duplicates, a collector, SSH, and cloud sources.

Price: Free; AGPL-3.0 source published on GitHub.
Platform: macOS, Windows, Linux
Consider: Uses a cross-platform Rust interface rather than SwiftUI

Read product guide → Compare with NullDisk →

OmniDiskSweeper

Free Mac column browser with Trash actions.

Price: Free download from The Omni Group.
Platform: macOS
Consider: Column browsing rather than a graphical disk map

Read product guide → Compare with NullDisk →

Diskaroo

Currently offers lifetime Pro free, but requires a Bravely Account and in-app claim.

Price: Vendor currently offers lifetime Pro free with a Bravely Account; sign-in is required.
Platform: macOS 14+, Windows 10/11 x64, Linux x64
Consider: Requires an account before the first scan

Read product guide → Compare with NullDisk →

diCleaner

Vendor currently includes storage analysis and maintenance tools free.

Price: Vendor says free to use with all current features included.
Platform: macOS 11.5+
Consider: Permanent removal and privacy tools have different effects from Trash

Read product guide → Compare with NullDisk →

Disk Inventory X

Free community projects; check whether you are downloading X, Xs, or Y.

Price: Original X is free under the GPL; Xs and Y are independent community projects.
Platform: Original X 1.3: macOS 10.13–10.15; Xs/Y requirements differ
Consider: The original X, revival Xs, and rewrite Y are different apps

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

Is NullDisk free for work?

The direct Mac edition includes all features for personal and workplace use with reminders. Optional reminder-free licenses cost $9.99 once per personal license or team seat. App Store terms are separate.

Does free mean open source?

No. GrandPerspective and SquirrelDisk publish source code. OmniDiskSweeper and diCleaner are offered free of charge; that alone does not grant an open-source license.

Can a free analyzer damage files?

Reading metadata is different from removing data. Review paths and the exact cleanup action; Trash may be recoverable, while permanent removal and shredding are not.