Choose by workflow
An open-source project for disk and memory visualization. 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.
Mac users who favor column browsing and integrated duplicate/cleanup tools.
Scroll across to compare
| Feature | Space Radar | NullDisk |
|---|---|---|
| Best fit | Developers exploring alternative visualizations and an inspectable codebase. | Mac users managing local/remote storage, and developers who need Git-aware cleanup or scriptable disk reports. |
| Visualization | Sunburst, treemap, and flamegraph | Radial map, treemap, and file list; CLI terminal treemap |
| Platforms and requirements | macOS, Windows, Linux (check current packages) | Mac app: macOS 14+; CLI: macOS, Linux, Windows |
| Pricing and editions | Free under the MIT license; check repository build/release instructions. | 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 | The project documents context-menu actions to locate, open, and delete files or directories; confirm recovery behavior in the selected build. | Review source and action: local Trash, explicit permanent removal, or backup/delete; remote and cloud actions depend on the destination. |
| Reports and portability | Consult the exact build’s save/export controls. Keep any generated data and images; NullDisk does not document importing Space Radar sessions. | CLI produces JSON/NDJSON scan reports. Third-party scan files are not directly imported into the Mac GUI. |
Consult the exact build’s save/export controls. Keep any generated data and images; NullDisk does not document importing Space Radar sessions.
Developers exploring alternative visualizations and an inspectable codebase. 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.