Head to head
| DissectMac | NullDisk | |
|---|---|---|
| Visualization | Treemap | Sunburst |
| Platform | macOS | macOS 14+ |
| Pricing | Freemium Free tier with paid unlocks at time of writing | Paid One-time purchase — see nulldisk.app/download for current pricing |
| Open source | No | No |
| Native Mac | Yes | Yes |
Updated September 2026 · Prices change — please verify with the vendor.
DissectMac
A fast local treemap with uninstaller and live monitoring.
＋ DissectMac: Strengths
- Fast local treemaps with live disk monitoring
- Bundled uninstaller covers app leftovers
- Free tier for basic analysis
－ DissectMac: Weaknesses
- Treemap-only visualization; no sunburst or list-first mode
- Monitoring features overlap with free macOS tools
- Young product with a thin review record
Read the review: DissectMac → · DissectMac See alternatives →
NullDisk
A native macOS disk-space analyzer with an interactive radial map.
＋ NullDisk: Strengths
- Native SwiftUI on macOS 14+, Apple Silicon and Intel
- Allocated-size measurement with hard-link dedup
- Staged collector-to-Trash workflow with Quick Look inspector
－ NullDisk: Weaknesses
- macOS only — no Windows or Linux build
- Paid license with no free tier
- No duplicate finder or all-in-one cleaner extras
NullDisk features → · Download NullDisk →
Verdict: DissectMac vs NullDisk
Choose NullDisk if you want a native Mac sunburst, allocated-size honesty, and a staged collector with zero telemetry. Choose DissectMac if you prefer treemap views at freemium pricing on macOS.
Frequently asked questions
Which is better, DissectMac or NullDisk?
DissectMac brings treemap views to macOS at freemium pricing; NullDisk answers with sunburst views on macOS 14+ at paid pricing. If you want native Mac polish with a staged, Trash-based cleanup, NullDisk takes it — otherwise pick by OS and map taste.
How do I switch from DissectMac to NullDisk?
Note the largest folders DissectMac flagged, run the same scan in NullDisk, and rebuild the cleanup in its removal collector. The step-by-step is on our switching guide.