Choose by workflow
A disk measurement utility with column browsing, filtering, and cleanup tools. If you need something different, compare these five options by the job they do. Choose by platform, features, and how you prefer to review files.
Mac users managing local/remote storage, and developers who need Git-aware cleanup or scriptable disk reports.
People who want saved storage history or a companion on iPhone/iPad.
Mac users who prefer rectangular views and age-based browsing.
Apple Silicon users on macOS 26+ who want two maps and staged cleanup.
Mac users seeking free storage analysis alongside broader maintenance tools.
Scroll across to compare
| Feature | WhatSize | NullDisk |
|---|---|---|
| Best fit | Mac users who favor column browsing and integrated duplicate/cleanup tools. | Mac users managing local/remote storage, and developers who need Git-aware cleanup or scriptable disk reports. |
| Visualization | Size-sorted columns and measurement views | Radial map, treemap, and file list; CLI terminal treemap |
| Platforms and requirements | macOS 11+ (current vendor requirements) | Mac app: macOS 14+; CLI: macOS, Linux, Windows |
| Pricing and editions | Vendor lists $14.99 and a 30-day trial; upgrades may be priced separately. | Direct Mac edition free with reminders; optional $9.99 one-time personal license or team seat removes reminders. App Store terms are separate. |
| Open source | No | No |
| Native macOS UI | Yes | Yes |
| Cleanup workflow | Review the chosen cleaning or duplicate action before applying it. | Review source and action: local Trash, explicit permanent removal, or backup/delete; remote and cloud actions depend on the destination. |
| Reports and portability | Preserve any saved measurements or reports supported by your version. The cited overview does not establish an import format shared with NullDisk. | CLI produces JSON/NDJSON scan reports. Third-party scan files are not directly imported into the Mac GUI. |
Preserve any saved measurements or reports supported by your version. The cited overview does not establish an import format shared with NullDisk.
Mac users who favor column browsing and integrated duplicate/cleanup tools. Keep it if that matches your needs. Consider a change for a specific requirement such as a different chart, remote sources, report exports, or development cleanup.
GrandPerspective and SquirrelDisk offer free open-source analysis. OmniDiskSweeper is free on Mac. All direct Mac features in NullDisk are free with reminders; reminder removal is optional. Freeware does not necessarily mean open source.
No. Keep any historical exports you need and run a fresh scan of the same location. NullDisk does not import these apps’ saved scans or cleanup queues.