Which fits your needs?
GrandPerspective: People who want a free, inspectable treemap and reusable scan records.
Nektony Disk Space Analyzer Pro: People who prefer an upfront App Store purchase with visual analysis and collections.
Features, pricing, and workflow
Scroll across to compare
| Feature | GrandPerspective | Nektony Disk Space Analyzer Pro |
|---|---|---|
| Best fit | People who want a free, inspectable treemap and reusable scan records. | People who prefer an upfront App Store purchase with visual analysis and collections. |
| Visualization | Treemap with configurable colors and filters | Sunburst, file directories, and largest-items list |
| Platforms and requirements | macOS 14+ (current release) | macOS |
| Pricing and editions | Free from SourceForge; the same app is $2.99 in the US App Store. | US Mac App Store lists $19.99 upfront; check your region’s current listing. |
| Open source | Yes | No |
| Native macOS UI | Yes | Yes |
| Cleanup workflow | Delete files or folders from the view; review selection and deletion preferences. | Collect selected files and folders, then move or remove them; check the current removal dialogue. |
| 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 App Store description does not establish scan-report export. Preserve paths and collection decisions before a fresh NullDisk scan. |
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
Nektony Disk Space Analyzer Pro: what stands out
A good fit for people who prefer an upfront App Store purchase with visual analysis and collections.
Nektony Disk Space Analyzer Pro: strengths
- Sunburst, largest-items list, and Quick Look
- Collect items for moving or removing
- Scans external storage and accessible cloud folders
Considerations
- Paid edition distinct from the free-download listing
- Access depends on macOS permissions and chosen scan locations
- A cloud-folder scan is not proof of direct provider-account access
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 Nektony Disk Space Analyzer Pro?
A good fit for people who prefer an upfront App Store purchase with visual analysis and collections. US Mac App Store lists $19.99 upfront; check your region’s current listing.
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.