Head to head
| JDiskReport | NullDisk | |
|---|---|---|
| Visualization | Charts | Sunburst |
| Platform | Windows + Mac + Linux (Java) | macOS 14+ |
| Pricing | Free Free of charge from JGoodies | Paid One-time purchase — see nulldisk.app/download for current pricing |
| Open source | No | No |
| Native Mac | No | Yes |
Updated September 2026 · Prices change — please verify with the vendor.
JDiskReport
Java statistics charts that find your most obsolete folders.
＋ JDiskReport: Strengths
- Rich statistics: size, age, and file-type distributions
- Free on every Java-capable platform
- Top-50 lists answer 'what's biggest' instantly
－ JDiskReport: Weaknesses
- Java UI feels alien on a modern Mac
- No deletion workflow — analysis only
- Aging codebase with infrequent updates
Read the review: JDiskReport → · JDiskReport See alternatives →
NullDisk
A native macOS disk-space analyzer with an interactive radial map.
＋ NullDisk: Strengths
- Native SwiftUI on macOS 14+, Apple Silicon and Intel
- Allocated-size measurement with hard-link dedup
- Staged collector-to-Trash workflow with Quick Look inspector
－ NullDisk: Weaknesses
- macOS only — no Windows or Linux build
- Paid license with no free tier
- No duplicate finder or all-in-one cleaner extras
NullDisk features → · Download NullDisk →
Verdict: JDiskReport vs NullDisk
Choose NullDisk if you want a native Mac sunburst, allocated-size honesty, and a staged collector with zero telemetry. Choose JDiskReport if you prefer charts views for free on Windows + Mac + Linux (Java).
Frequently asked questions
Which is better, JDiskReport or NullDisk?
JDiskReport brings charts views to Windows + Mac + Linux (Java) at free pricing; NullDisk answers with sunburst views on macOS 14+ at paid pricing. If you want native Mac polish with a staged, Trash-based cleanup, NullDisk takes it — otherwise pick by OS and map taste.
How do I switch from JDiskReport to NullDisk?
Note the largest folders JDiskReport flagged, run the same scan in NullDisk, and rebuild the cleanup in its removal collector. The step-by-step is on our switching guide.