Head to head
| JDiskReport | WhatSize | |
|---|---|---|
| Visualization | Charts | List |
| Platform | Windows + Mac + Linux (Java) | macOS |
| Pricing | Free Free of charge from JGoodies | Paid Paid one-time license (around $15 at time of writing) |
| 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 →
WhatSize
A fast measuring sorter with column views and cleanup tools.
＋ WhatSize: Strengths
- Deep measuring with column, outline, and chart views
- Finds large, duplicate, and orphaned files beyond simple sizes
- Appeals to power users who live in column browsers
－ WhatSize: Weaknesses
- Dense, technical UI with a real learning curve
- Paid license with no free tier for casual use
- Visualization is secondary to tables and lists
Read the review: WhatSize → · WhatSize See alternatives →
Verdict: JDiskReport vs WhatSize
Choose JDiskReport if you want charts visualization on Windows + Mac + Linux (Java). Choose WhatSize if you prefer list views at paid pricing on macOS. 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, JDiskReport or WhatSize?
JDiskReport wins on charts visualization for Windows + Mac + Linux (Java); WhatSize wins on list views for macOS. On price, Free (JDiskReport) vs Paid (WhatSize). 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 JDiskReport or WhatSize wins on price.