NullDisk our pick
A native macOS disk-space analyzer with an interactive radial map. Native SwiftUI, allocated-size honesty, staged Trash-based removal, zero data collection.
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Head to head: NullDisk vs SquirrelDisk
| NullDisk | SquirrelDisk | |
|---|---|---|
| Visualization | Sunburst radial map | Sunburst |
| Platform | macOS 14+ | macOS + Windows + Linux |
| Pricing | Paid | Open source |
| Open source | No (offline, zero-data) | Yes |
| Cleanup flow | Staged collector → Trash | Varies by tool |
Key facts: SquirrelDisk
| SquirrelDisk | |
|---|---|
| Vendor | Adileo Barone |
| Platform | macOS + Windows + Linux |
| Pricing | Open source — Free and open source (AGPL-3.0) |
| Visualization | Sunburst |
| Open source | Yes |
Updated September 2026 · Prices change — please verify with the vendor. Price at time of writing: Free and open source (AGPL-3.0).
NullDisk fits if …
- Truly native: Swift and SwiftUI on macOS, not a cross-platform toolkit.
- A staged removal collector: queue suspects, review, then Trash everything together.
- Allocated-size measurement with hard-link dedup, so reclaimed space matches reality.
Pros & cons
＋ Strengths
- Free and open source on every desktop OS
- Genuinely easy sunburst experience
- No account, no telemetry, no upsell
－ Weaknesses
- Java-based UI rather than native Mac controls
- No collector tray or staged-removal workflow
- Solo-maintainer pace on features and fixes
Frequently asked questions
What is the best alternative to SquirrelDisk for Mac?
For most Mac users it's NullDisk: native SwiftUI, a radial sunburst map, a staged removal collector, and zero data collection. SquirrelDisk users who want sunburst views and open source pricing will feel at home within minutes.
Is there a free alternative to SquirrelDisk?
Yes — GrandPerspective and Disk Inventory X are free and open source with genuine treemap analysis. They lack NullDisk's collector workflow and sunburst map, but they find the biggest hogs fast.
How do I switch from SquirrelDisk to NullDisk?
Note the largest folders SquirrelDisk flagged, then run the same scan in NullDisk and rebuild the cleanup in its removal collector. The full walkthrough is on our switching guide.
Bottom line
SquirrelDisk is a fine free tool for sunburst fans on macOS + Windows + Linux. But if you want the whole job — see, stage, and safely remove — done natively on a modern Mac, NullDisk is the upgrade. Switching guide →