Which fits your needs?
GrandPerspective: People who want a free, inspectable treemap and reusable scan records.
LumaDisk: Mac/Windows users wanting maps, duplicates, and build-cache discovery.
Features, pricing, and workflow
Scroll across to compare
| Feature | GrandPerspective | LumaDisk |
|---|---|---|
| Best fit | People who want a free, inspectable treemap and reusable scan records. | Mac/Windows users wanting maps, duplicates, and build-cache discovery. |
| Visualization | Treemap with configurable colors and filters | Sunburst, treemap, duplicate and unused-file lists |
| Platforms and requirements | macOS 14+ (current release) | macOS (Apple Silicon), Windows |
| Pricing and editions | Free from SourceForge; the same app is $2.99 in the US App Store. | Seven-day full trial; scanning stays free. Vendor lists $6.89 once for the remaining features. |
| Open source | Yes | No |
| Native macOS UI | Yes | Cross-platform interface |
| Cleanup workflow | Delete files or folders from the view; review selection and deletion preferences. | Queue selected items for removal; review the current app’s confirmation and recovery options. |
| Reports and portability | Save the scan for reopening in GrandPerspective, or export text and images. NullDisk does not import GrandPerspective scan files; retain exports and rescan the same location. | The cited page does not establish scan-report export. Preserve paths and selections before starting a fresh scan in NullDisk. |
GrandPerspective: what stands out
A good fit for people who want a free, inspectable treemap and reusable scan records.
GrandPerspective: strengths
- Configurable colors, masks, searches, and scan exclusions
- Quick Look, Finder integration, and file/folder deletion
- Save/reload scans and export text or images
Considerations
- Treemap rather than radial navigation
- Older macOS versions require an older release
- App Store updates can follow SourceForge releases later
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
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 GrandPerspective?
A good fit for people who want a free, inspectable treemap and reusable scan records. Free from SourceForge; the same app is $2.99 in the US App Store.
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.
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.