Which fits your needs?
Space Radar: Developers exploring alternative visualizations and an inspectable codebase.
WhatSize: Mac users who favor column browsing and integrated duplicate/cleanup tools.
Features, pricing, and workflow
Scroll across to compare
| Feature | Space Radar | WhatSize |
|---|---|---|
| Best fit | Developers exploring alternative visualizations and an inspectable codebase. | Mac users who favor column browsing and integrated duplicate/cleanup tools. |
| Visualization | Sunburst, treemap, and flamegraph | Size-sorted columns and measurement views |
| Platforms and requirements | macOS, Windows, Linux (check current packages) | macOS 11+ (current vendor requirements) |
| Pricing and editions | Free under the MIT license; check repository build/release instructions. | Vendor lists $14.99 and a 30-day trial; upgrades may be priced separately. |
| Open source | Yes | No |
| Native macOS UI | Cross-platform interface | Yes |
| Cleanup workflow | The project documents context-menu actions to locate, open, and delete files or directories; confirm recovery behavior in the selected build. | Review the chosen cleaning or duplicate action before applying it. |
| Reports and portability | Consult the exact build’s save/export controls. Keep any generated data and images; NullDisk does not document importing Space Radar sessions. | Preserve any saved measurements or reports supported by your version. The cited overview does not establish an import format shared with NullDisk. |
Space Radar: what stands out
A good fit for developers exploring alternative visualizations and an inspectable codebase.
Space Radar: strengths
- Sunburst, treemap, and flamegraph visualizations
- MIT-licensed source for inspection and modification
- Disk and memory visualization in one project
Considerations
- Packaging and dependencies vary across repository versions
- Check the current release for your OS and CPU
- Do not infer cleanup or report formats from the chart selection
WhatSize: what stands out
A good fit for Mac users who favor column browsing and integrated duplicate/cleanup tools.
WhatSize: strengths
- Size-sorted columns and detailed filtering
- Duplicate-file tools and cleanup categories
- Updates measurements as the filesystem changes
Considerations
- Paid license after the trial
- Cleanup categories still require your judgment
- Check upgrade terms separately from the initial purchase
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 Space Radar?
A good fit for developers exploring alternative visualizations and an inspectable codebase. Free under the MIT license; check repository build/release instructions.
When should I choose WhatSize?
A good fit for Mac users who favor column browsing and integrated duplicate/cleanup tools. Vendor lists $14.99 and a 30-day trial; upgrades may be priced separately.
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.