Head to head
| GrandPerspective | JDiskReport | |
|---|---|---|
| Visualization | Treemap | Charts |
| Platform | macOS | Windows + Mac + Linux (Java) |
| Pricing | Open source Free and open source (GPL); small App Store fee for the packaged build | Free Free of charge from JGoodies |
| Open source | Yes | No |
| Native Mac | Yes | No |
Updated September 2026 · Prices change — please verify with the vendor.
GrandPerspective
The tiny open-source treemap that shows your biggest files instantly.
＋ GrandPerspective: Strengths
- Free and open source with a tiny footprint
- Treemap rectangles make the single biggest space hog obvious
- Fast rescans and a loyal power-user community
－ GrandPerspective: Weaknesses
- Treemap UI is utilitarian — no sunburst, no guided cleanup
- No collector tray or duplicate finder; deletion is file-by-file
- Development pace is slow compared with commercial rivals
Read the review: GrandPerspective → · GrandPerspective See alternatives →
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 →
Verdict: GrandPerspective vs JDiskReport
Choose GrandPerspective if you want treemap visualization with open-source transparency on macOS. Choose JDiskReport if you prefer charts views for free on Windows + Mac + Linux (Java). And if you want a native Mac sunburst with a staged collector and zero telemetry, NullDisk is the third option that beats both on workflow.
Frequently asked questions
Which is better, GrandPerspective or JDiskReport?
GrandPerspective wins on treemap visualization for macOS; JDiskReport wins on charts views for Windows + Mac + Linux (Java). On price, Open source (GrandPerspective) vs Free (JDiskReport). The honest answer depends on your OS and whether you prefer maps or lists — read the verdict below.
Is there something better than both?
If you want a native Mac sunburst with allocated-size honesty, a staged removal collector, and zero data collection, NullDisk beats both on workflow — even where GrandPerspective or JDiskReport wins on price.