Which fits your needs?
JDiskReport: Users who want cross-platform disk statistics and already use Java.
LumaDisk: Mac/Windows users wanting maps, duplicates, and build-cache discovery.
Features, pricing, and workflow
Scroll across to compare
| Feature | JDiskReport | LumaDisk |
|---|---|---|
| Best fit | Users who want cross-platform disk statistics and already use Java. | Mac/Windows users wanting maps, duplicates, and build-cache discovery. |
| Visualization | Overview statistics charts and detail tables | Sunburst, treemap, duplicate and unused-file lists |
| Platforms and requirements | macOS, Windows, Linux (Java) | macOS (Apple Silicon), Windows |
| Pricing and editions | No-charge, ad-free freeware; this does not mean open source. | Seven-day full trial; scanning stays free. Vendor lists $6.89 once for the remaining features. |
| Open source | No | No |
| Native macOS UI | Cross-platform interface | Cross-platform interface |
| Cleanup workflow | Use the statistics to guide file review; the cited overview does not specify removal semantics. | Queue selected items for removal; review the current app’s confirmation and recovery options. |
| Reports and portability | Preserve any saved scan files supported by your version and keep important table entries. NullDisk does not import JDiskReport scan files. | The cited page does not establish scan-report export. Preserve paths and selections before starting a fresh scan in NullDisk. |
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
LumaDisk: what stands out
A good fit for Mac/Windows users wanting maps, duplicates, and build-cache discovery.
LumaDisk: strengths
- Sunburst and treemap with live scan updates
- Build-cache radar, duplicate groups, and unused-file lists
- OneDrive/Dropbox connections; iCloud through its local folder
Considerations
- Verify Mac CPU support; current site highlights Apple Silicon
- Features beyond scanning require an unlock after trial
- Google Drive is listed as coming soon
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 LumaDisk?
A good fit for Mac/Windows users wanting maps, duplicates, and build-cache discovery. Seven-day full trial; scanning stays free. Vendor lists $6.89 once for the remaining features.
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.