Which fits your needs?
Disk Graph: People who want saved storage history or a companion on iPhone/iPad.
JDiskReport: Users who want cross-platform disk statistics and already use Java.
Features, pricing, and workflow
Scroll across to compare
| Feature | Disk Graph | JDiskReport |
|---|---|---|
| Best fit | People who want saved storage history or a companion on iPhone/iPad. | Users who want cross-platform disk statistics and already use Java. |
| Visualization | Radial pie chart, treemap, and snapshot sequences | Overview statistics charts and detail tables |
| Platforms and requirements | macOS, iOS, iPadOS | macOS, Windows, Linux (Java) |
| Pricing and editions | Commercial app; check current developer and App Store purchase options. | No-charge, ad-free freeware; this does not mean open source. |
| Open source | No | No |
| Native macOS UI | Yes | Cross-platform interface |
| Cleanup workflow | Preview, reveal, or move selected items to the bin. | Use the statistics to guide file review; the cited overview does not specify removal semantics. |
| Reports and portability | Export a snapshot and keep it: the developer documents JSON/TSV records that can be viewed in a text editor. NullDisk does not import these snapshots. | Preserve any saved scan files supported by your version and keep important table entries. NullDisk does not import JDiskReport scan files. |
Disk Graph: what stands out
A good fit for people who want saved storage history or a companion on iPhone/iPad.
Disk Graph: strengths
- Switch between radial charts and treemaps
- Logical size, allocated size, or file-count modes
- Export snapshots and animate changes across a sequence
Considerations
- Mobile scans cover locations accessible through Files
- Snapshots record inventory, not backed-up file contents
- Historical snapshots need a fresh scan before cleanup
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 Disk Graph?
A good fit for people who want saved storage history or a companion on iPhone/iPad. Commercial app; check current developer and App Store purchase options.
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.