Choose by workflow
A Java disk statistics tool with overview charts and detailed tables. 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.
People wanting a free open-source GUI across desktop systems and remote storage.
Developers exploring alternative visualizations and an inspectable codebase.
Scroll across to compare
| Feature | JDiskReport | NullDisk |
|---|---|---|
| Best fit | Users who want cross-platform disk statistics and already use Java. | Mac users managing local/remote storage, and developers who need Git-aware cleanup or scriptable disk reports. |
| Visualization | Overview statistics charts and detail tables | Radial map, treemap, and file list; CLI terminal treemap |
| Platforms and requirements | macOS, Windows, Linux (Java) | Mac app: macOS 14+; CLI: macOS, Linux, Windows |
| Pricing and editions | No-charge, ad-free freeware; this does not mean open source. | 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 | No | No |
| Native macOS UI | Cross-platform interface | Yes |
| Cleanup workflow | Use the statistics to guide file review; the cited overview does not specify removal semantics. | Review source and action: local Trash, explicit permanent removal, or backup/delete; remote and cloud actions depend on the destination. |
| Reports and portability | Preserve any saved scan files supported by your version and keep important table entries. NullDisk does not import JDiskReport scan files. | CLI produces JSON/NDJSON scan reports. Third-party scan files are not directly imported into the Mac GUI. |
Preserve any saved scan files supported by your version and keep important table entries. NullDisk does not import JDiskReport scan files.
Users who want cross-platform disk statistics and already use Java. 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.