Choose by workflow
A Rust disk analyzer with sunburst, treemap, duplicates, SSH, and cloud sources. If you need something different, compare these five options by the job they do. Choose by platform, features, and how you prefer to review files.
Mac users managing local/remote storage, and developers who need Git-aware cleanup or scriptable disk reports.
Mac/Windows users wanting maps, duplicates, and build-cache discovery.
Users wanting one account-based analyzer across Mac, Windows, and Linux.
Developers exploring alternative visualizations and an inspectable codebase.
Mac users who favor column browsing and integrated duplicate/cleanup tools.
Scroll across to compare
| Feature | SquirrelDisk | NullDisk |
|---|---|---|
| Best fit | People wanting a free open-source GUI across desktop systems and remote storage. | Mac users managing local/remote storage, and developers who need Git-aware cleanup or scriptable disk reports. |
| Visualization | Sunburst, treemap, file list, and duplicates | Radial map, treemap, and file list; CLI terminal treemap |
| Platforms and requirements | macOS, Windows, Linux | Mac app: macOS 14+; CLI: macOS, Linux, Windows |
| Pricing and editions | Free; AGPL-3.0 source published on GitHub. | Direct Mac edition free with reminders; optional $9.99 one-time personal license or team seat removes reminders. App Store terms are separate. |
| Open source | Yes | No |
| Native macOS UI | Cross-platform interface | Yes |
| Cleanup workflow | Collector offers Trash, permanent removal, secure erase, or backup before deletion. | Review source and action: local Trash, explicit permanent removal, or backup/delete; remote and cloud actions depend on the destination. |
| Reports and portability | The current overview does not establish an interoperable scan-report format. Preserve paths, duplicate decisions, and remote source settings separately. | CLI produces JSON/NDJSON scan reports. Third-party scan files are not directly imported into the Mac GUI. |
The current overview does not establish an interoperable scan-report format. Preserve paths, duplicate decisions, and remote source settings separately.
People wanting a free open-source GUI across desktop systems and remote storage. Keep it if that matches your needs. Consider a change for a specific requirement such as a different chart, remote sources, report exports, or development cleanup.
GrandPerspective and SquirrelDisk offer free open-source analysis. OmniDiskSweeper is free on Mac. All direct Mac features in NullDisk are free with reminders; reminder removal is optional. Freeware does not necessarily mean open source.
No. Keep any historical exports you need and run a fresh scan of the same location. NullDisk does not import these apps’ saved scans or cleanup queues.