Which fits your needs?
JDiskReport: Users who want cross-platform disk statistics and already use Java.
Space Radar: Developers exploring alternative visualizations and an inspectable codebase.
Features, pricing, and workflow
Scroll across to compare
| Feature | JDiskReport | Space Radar |
|---|---|---|
| Best fit | Users who want cross-platform disk statistics and already use Java. | Developers exploring alternative visualizations and an inspectable codebase. |
| Visualization | Overview statistics charts and detail tables | Sunburst, treemap, and flamegraph |
| Platforms and requirements | macOS, Windows, Linux (Java) | macOS, Windows, Linux (check current packages) |
| Pricing and editions | No-charge, ad-free freeware; this does not mean open source. | Free under the MIT license; check repository build/release instructions. |
| Open source | No | Yes |
| 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. | The project documents context-menu actions to locate, open, and delete files or directories; confirm recovery behavior in the selected build. |
| Reports and portability | Preserve any saved scan files supported by your version and keep important table entries. NullDisk does not import JDiskReport scan files. | Consult the exact build’s save/export controls. Keep any generated data and images; NullDisk does not document importing Space Radar sessions. |
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
Space Radar: what stands out
A good fit for developers exploring alternative visualizations and an inspectable codebase.
Space Radar: strengths
- Sunburst, treemap, and flamegraph visualizations
- MIT-licensed source for inspection and modification
- Disk and memory visualization in one project
Considerations
- Packaging and dependencies vary across repository versions
- Check the current release for your OS and CPU
- Do not infer cleanup or report formats from the chart selection
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 Space Radar?
A good fit for developers exploring alternative visualizations and an inspectable codebase. Free under the MIT license; check repository build/release instructions.
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.