Which fits your needs?
Disk Graph: People who want saved storage history or a companion on iPhone/iPad.
SquirrelDisk: People wanting a free open-source GUI across desktop systems and remote storage.
Features, pricing, and workflow
Scroll across to compare
| Feature | Disk Graph | SquirrelDisk |
|---|---|---|
| Best fit | People who want saved storage history or a companion on iPhone/iPad. | People wanting a free open-source GUI across desktop systems and remote storage. |
| Visualization | Radial pie chart, treemap, and snapshot sequences | Sunburst, treemap, file list, and duplicates |
| Platforms and requirements | macOS, iOS, iPadOS | macOS, Windows, Linux |
| Pricing and editions | Commercial app; check current developer and App Store purchase options. | Free; AGPL-3.0 source published on GitHub. |
| Open source | No | Yes |
| Native macOS UI | Yes | Cross-platform interface |
| Cleanup workflow | Preview, reveal, or move selected items to the bin. | Collector offers Trash, permanent removal, secure erase, or backup before deletion. |
| Reports and portability | Export a snapshot and keep it: the developer documents JSON/TSV records that can be viewed in a text editor. NullDisk does not import these snapshots. | The current overview does not establish an interoperable scan-report format. Preserve paths, duplicate decisions, and remote source settings separately. |
Disk Graph: what stands out
A good fit for people who want saved storage history or a companion on iPhone/iPad.
Disk Graph: strengths
- Switch between radial charts and treemaps
- Logical size, allocated size, or file-count modes
- Export snapshots and animate changes across a sequence
Considerations
- Mobile scans cover locations accessible through Files
- Snapshots record inventory, not backed-up file contents
- Historical snapshots need a fresh scan before cleanup
SquirrelDisk: what stands out
A good fit for people wanting a free open-source GUI across desktop systems and remote storage.
SquirrelDisk: strengths
- Live maps and a staged removal collector
- Content-based duplicate search
- SSH and rclone-backed cloud storage
Considerations
- Uses a cross-platform Rust interface rather than SwiftUI
- Permanent deletion and secure erase require deliberate review
- Cloud/SSH actions depend on provider and remote-system support
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 Disk Graph?
A good fit for people who want saved storage history or a companion on iPhone/iPad. Commercial app; check current developer and App Store purchase options.
When should I choose SquirrelDisk?
A good fit for people wanting a free open-source GUI across desktop systems and remote storage. Free; AGPL-3.0 source published on GitHub.
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.