Which fits your needs?
GrandPerspective: People who want a free, inspectable treemap and reusable scan records.
Nektony Disk Space Analyzer: Mac users who want a sunburst and integrated file-management actions.
Features, pricing, and workflow
Scroll across to compare
| Feature | GrandPerspective | Nektony Disk Space Analyzer |
|---|---|---|
| Best fit | People who want a free, inspectable treemap and reusable scan records. | Mac users who want a sunburst and integrated file-management actions. |
| Visualization | Treemap with configurable colors and filters | Sunburst, 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. | Free download; verify the selected store edition and its in-app purchase terms. |
| Open source | Yes | No |
| Native macOS UI | Yes | Yes |
| Cleanup workflow | Delete files or folders from the view; review selection and deletion preferences. | Manage selected items with copy, move, and removal actions; check edition-specific availability. |
| 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 overview does not establish a portable report format. Keep paths and the selected scan scope before comparing results 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
Nektony Disk Space Analyzer: what stands out
A good fit for Mac users who want a sunburst and integrated file-management actions.
Nektony Disk Space Analyzer: strengths
- Sunburst and largest-items browsing
- Copy, move, or remove selected files
- Supports external volumes and accessible cloud-storage folders
Considerations
- Standard and Pro have separate store listings
- Check which actions require a purchase in the selected edition
- Mounted cloud folders do not necessarily represent an entire provider account
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?
A good fit for Mac users who want a sunburst and integrated file-management actions. Free download; verify the selected store edition and its in-app purchase terms.
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.