Head to head
| NullDisk | OmniDiskSweeper | |
|---|---|---|
| Visualization | Sunburst | List |
| Platform | macOS 14+ | macOS |
| Pricing | Paid One-time purchase — see nulldisk.app/download for current pricing | Free Free freeware from The Omni Group |
| Open source | No | No |
| Native Mac | Yes | Yes |
Updated September 2026 · Prices change — please verify with the vendor.
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 →
OmniDiskSweeper
A largest-first column browser for quick, no-frills cleanup.
＋ OmniDiskSweeper: Strengths
- Completely free from a trusted Mac developer
- Largest-first sorting finds big folders with zero learning curve
- Lightweight and fast on any Mac
－ OmniDiskSweeper: Weaknesses
- No visual map at all — pure ranked lists
- Dated interface that hasn't meaningfully evolved in years
- No collector, previews, or safety rails beyond the Trash
Read the review: OmniDiskSweeper → · OmniDiskSweeper See alternatives →
Verdict: NullDisk vs OmniDiskSweeper
Choose NullDisk if you want a native Mac sunburst, allocated-size honesty, and a staged collector with zero telemetry. Choose OmniDiskSweeper if you prefer list views for free on macOS.
Frequently asked questions
Which is better, NullDisk or OmniDiskSweeper?
NullDisk brings sunburst views to macOS 14+ at paid pricing; OmniDiskSweeper answers with list views on macOS at free 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 OmniDiskSweeper to NullDisk?
Note the largest folders OmniDiskSweeper flagged, run the same scan in NullDisk, and rebuild the cleanup in its removal collector. The step-by-step is on our switching guide.