Which fits your needs?
JDiskReport: Users who want cross-platform disk statistics and already use Java.
Klarity Disk: Mac users who prefer rectangular views and age-based browsing.
Features, pricing, and workflow
Scroll across to compare
| Feature | JDiskReport | Klarity Disk |
|---|---|---|
| Best fit | Users who want cross-platform disk statistics and already use Java. | Mac users who prefer rectangular views and age-based browsing. |
| Visualization | Overview statistics charts and detail tables | Treemap, icicle view, and Large Files list |
| Platforms and requirements | macOS, Windows, Linux (Java) | macOS |
| Pricing and editions | No-charge, ad-free freeware; this does not mean open source. | Vendor lists $6.99 once through the Mac App Store. |
| 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. | Moves items to Trash; folders of 1 GB or more require slide confirmation. |
| Reports and portability | Preserve any saved scan files supported by your version and keep important table entries. NullDisk does not import JDiskReport scan files. | Report export is not established by the cited overview. Preserve paths or screenshots if you need a record outside the app. |
JDiskReport: what stands out
A good fit for users who want cross-platform disk statistics and already use Java.
JDiskReport: strengths
- Disk usage statistics in charts and tables
- Runs across Java-capable desktop systems
- Free without ads or expiry
Considerations
- Requires a compatible Java runtime
- Freeware rather than an open-source project
- Check the manual for report storage and file-management actions
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
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 JDiskReport?
A good fit for users who want cross-platform disk statistics and already use Java. No-charge, ad-free freeware; this does not mean open source.
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.
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.