Which fits your needs?
Klarity Disk: Mac users who prefer rectangular views and age-based browsing.
NullDisk: Mac users managing local/remote storage, and developers who need Git-aware cleanup or scriptable disk reports.
Features, pricing, and workflow
Scroll across to compare
| Feature | Klarity Disk | NullDisk |
|---|---|---|
| Best fit | Mac users who prefer rectangular views and age-based browsing. | Mac users managing local/remote storage, and developers who need Git-aware cleanup or scriptable disk reports. |
| Visualization | Treemap, icicle view, and Large Files list | Radial map, treemap, and file list; CLI terminal treemap |
| Platforms and requirements | macOS | Mac app: macOS 14+; CLI: macOS, Linux, Windows |
| Pricing and editions | Vendor lists $6.99 once through the Mac 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 | No | No |
| Native macOS UI | Yes | Yes |
| Cleanup workflow | Moves items to Trash; folders of 1 GB or more require slide confirmation. | Review source and action: local Trash, explicit permanent removal, or backup/delete; remote and cloud actions depend on the destination. |
| Reports and portability | Report export is not established by the cited overview. Preserve paths or screenshots if you need a record outside the app. | CLI produces JSON/NDJSON scan reports. Third-party scan files are not directly imported into the Mac GUI. |
Klarity Disk: what stands out
A good fit for Mac users who prefer rectangular views and age-based browsing.
Klarity Disk: strengths
- Treemap and icicle layouts with age-based colors
- Large Files list and hidden Library visibility
- Trash-only removal with extra confirmation for large folders
Considerations
- No sunburst in the documented view selection
- Age indicates modification history, not whether a file is unnecessary
- System-folder guards intentionally limit removal
NullDisk: what stands out
A good fit for Mac users managing local/remote storage, and developers who need Git-aware cleanup or scriptable disk reports.
NullDisk: strengths
- Radial and treemap views with local, SSH, and cloud sources
- Git-aware development cleanup for generated output and eligible worktrees
- Native Mac UI plus terminal UI and JSON/NDJSON CLI reports
Considerations
- Desktop GUI requires macOS 14+; Linux/Windows use the separate CLI
- Mac app sends anonymous usage telemetry; no in-app opt-out at this review
- No content-based duplicate finder; allocated bytes are not a guaranteed recovery total
For a useful comparison on your own drive, match the scan root, access permissions, and size mode. Chart style changes how you explore the results; it does not by itself establish measurement accuracy.
Common questions
When should I choose Klarity Disk?
A good fit for Mac users who prefer rectangular views and age-based browsing. Vendor lists $6.99 once through the Mac App Store.
When should I choose NullDisk?
A good fit for Mac users managing local/remote storage, and developers who need Git-aware cleanup or scriptable disk reports. Direct Mac edition free with reminders; optional $9.99 one-time personal license or team seat removes reminders. App Store terms are separate.
Will both apps show the same size?
Not necessarily. Match the scan root, permissions, exclusions, and logical/allocated-size mode. Hard links, APFS clones, snapshots, sparse files, and cloud placeholders can change totals. A reported size is not a guaranteed amount recovered after deletion.