Which fits your needs?
LumaDisk: Mac/Windows users wanting maps, duplicates, and build-cache discovery.
WhatSize: Mac users who favor column browsing and integrated duplicate/cleanup tools.
Features, pricing, and workflow
Scroll across to compare
| Feature | LumaDisk | WhatSize |
|---|---|---|
| Best fit | Mac/Windows users wanting maps, duplicates, and build-cache discovery. | Mac users who favor column browsing and integrated duplicate/cleanup tools. |
| Visualization | Sunburst, treemap, duplicate and unused-file lists | Size-sorted columns and measurement views |
| Platforms and requirements | macOS (Apple Silicon), Windows | macOS 11+ (current vendor requirements) |
| Pricing and editions | Seven-day full trial; scanning stays free. Vendor lists $6.89 once for the remaining features. | Vendor lists $14.99 and a 30-day trial; upgrades may be priced separately. |
| Open source | No | No |
| Native macOS UI | Cross-platform interface | Yes |
| Cleanup workflow | Queue selected items for removal; review the current app’s confirmation and recovery options. | Review the chosen cleaning or duplicate action before applying it. |
| Reports and portability | The cited page does not establish scan-report export. Preserve paths and selections before starting a fresh scan in NullDisk. | Preserve any saved measurements or reports supported by your version. The cited overview does not establish an import format shared with NullDisk. |
LumaDisk: what stands out
A good fit for Mac/Windows users wanting maps, duplicates, and build-cache discovery.
LumaDisk: strengths
- Sunburst and treemap with live scan updates
- Build-cache radar, duplicate groups, and unused-file lists
- OneDrive/Dropbox connections; iCloud through its local folder
Considerations
- Verify Mac CPU support; current site highlights Apple Silicon
- Features beyond scanning require an unlock after trial
- Google Drive is listed as coming soon
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 LumaDisk?
A good fit for Mac/Windows users wanting maps, duplicates, and build-cache discovery. Seven-day full trial; scanning stays free. Vendor lists $6.89 once for the remaining features.
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.