Choose by workflow
An open-source Mac treemap with filters, Quick Look, and saved scans. 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.
Users interested in the classic treemap or its community successors.
People who want free inspection and optional paid app/leftover cleanup.
Mac users who want a sunburst, cloud connections, and snapshot tools.
Mac users who prefer a free size-sorted browser to a chart.
Scroll across to compare
| Feature | GrandPerspective | NullDisk |
|---|---|---|
| Best fit | People who want a free, inspectable treemap and reusable scan records. | Mac users managing local/remote storage, and developers who need Git-aware cleanup or scriptable disk reports. |
| Visualization | Treemap with configurable colors and filters | Radial map, treemap, and file list; CLI terminal treemap |
| Platforms and requirements | macOS 14+ (current release) | Mac app: macOS 14+; CLI: macOS, Linux, Windows |
| Pricing and editions | Free from SourceForge; the same app is $2.99 in the US App Store. | 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 | Yes | Yes |
| Cleanup workflow | Delete files or folders from the view; review selection and deletion preferences. | Review source and action: local Trash, explicit permanent removal, or backup/delete; remote and cloud actions depend on the destination. |
| Reports and portability | Save the scan for reopening in GrandPerspective, or export text and images. NullDisk does not import GrandPerspective scan files; retain exports and rescan the same location. | CLI produces JSON/NDJSON scan reports. Third-party scan files are not directly imported into the Mac GUI. |
Save the scan for reopening in GrandPerspective, or export text and images. NullDisk does not import GrandPerspective scan files; retain exports and rescan the same location.
People who want a free, inspectable treemap and reusable scan records. 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.