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.
Top 5 WhatSize alternatives
OmniDiskSweeper
A largest-first column browser for quick, no-frills cleanup.
Disk Xray
All-in-one analyzer, duplicate finder, uninstaller, and shredder.
SimplyDiskSweeper
A minimal sorted-list cleaner for quick disk sweeps.
SpacePeek
A read-only Quick Look inspector for folders and archives.
Mand mod mand: NullDisk vs WhatSize
| NullDisk | WhatSize | |
|---|---|---|
| Visualization | Sunburst radial map | List |
| Platform | macOS 14+ | macOS |
| Pricing | Paid | Paid |
| Open source | No (offline, zero-data) | No |
| Cleanup flow | Staged collector → Trash | Direct deletion from lists |
Nøglefakta: WhatSize
| WhatSize | |
|---|---|
| Vendor | id-design, inc. |
| Platform | macOS |
| Pricing | Paid — Paid one-time license (around $15 at time of writing) |
| Visualization | List |
| Open source | No |
Opdateret september 2026 · Priser ændres — verificér hos leverandøren. Pris ved skrivetidspunkt: Paid one-time license (around $15 at time of writing).
NullDisk passer, hvis …
- A radial sunburst map instead of lists or treemaps — see usage at a glance and drill in with a click.
- Honest one-time purchase instead of subscriptions or gated tiers.
- Fully offline with a published zero-data policy — nothing ever leaves your Mac.
Pros & cons
＋ Styrker
- Deep measuring with column, outline, and chart views
- Finds large, duplicate, and orphaned files beyond simple sizes
- Appeals to power users who live in column browsers
－ Svagheder
- Dense, technical UI with a real learning curve
- Paid license with no free tier for casual use
- Visualization is secondary to tables and lists
Ofte stillede spørgsmål
What is the best alternative to WhatSize for Mac?
For most Mac users it's NullDisk: native SwiftUI, a radial sunburst map, a staged removal collector, and zero data collection. WhatSize users who want list views and paid pricing will feel at home within minutes.
Is there a free alternative to WhatSize?
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 WhatSize to NullDisk?
Note the largest folders WhatSize flagged, then run the same scan in NullDisk and rebuild the cleanup in its removal collector. The full walkthrough is on our switching guide.
Kort sagt
WhatSize is a capable tool for list fans on macOS. But if you want the whole job — see, stage, and safely remove — done natively on a modern Mac, NullDisk is the upgrade. Skifteguide →