Which fits your needs?
GrandPerspective: People who want a free, inspectable treemap and reusable scan records.
JDiskReport: Users who want cross-platform disk statistics and already use Java.
Features, pricing, and workflow
Scroll across to compare
| Feature | GrandPerspective | JDiskReport |
|---|---|---|
| Best fit | People who want a free, inspectable treemap and reusable scan records. | Users who want cross-platform disk statistics and already use Java. |
| Visualization | Treemap with configurable colors and filters | Overview statistics charts and detail tables |
| Platforms and requirements | macOS 14+ (current release) | macOS, Windows, Linux (Java) |
| Pricing and editions | Free from SourceForge; the same app is $2.99 in the US App Store. | No-charge, ad-free freeware; this does not mean open source. |
| Open source | Yes | No |
| Native macOS UI | Yes | Cross-platform interface |
| Cleanup workflow | Delete files or folders from the view; review selection and deletion preferences. | Use the statistics to guide file review; the cited overview does not specify removal semantics. |
| Reports and portability | Save the scan for reopening in GrandPerspective, or export text and images. NullDisk does not import GrandPerspective scan files; retain exports and rescan the same location. | Preserve any saved scan files supported by your version and keep important table entries. NullDisk does not import JDiskReport scan files. |
GrandPerspective: what stands out
A good fit for people who want a free, inspectable treemap and reusable scan records.
GrandPerspective: strengths
- Configurable colors, masks, searches, and scan exclusions
- Quick Look, Finder integration, and file/folder deletion
- Save/reload scans and export text or images
Considerations
- Treemap rather than radial navigation
- Older macOS versions require an older release
- App Store updates can follow SourceForge releases later
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
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 GrandPerspective?
A good fit for people who want a free, inspectable treemap and reusable scan records. Free from SourceForge; the same app is $2.99 in the US App Store.
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.
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.