The largest items are a useful starting point, but size does not establish that a file is disposable. Match scan permissions and size modes, then inspect the file and its owning application.
NullDisk fits if you want a native Mac GUI with radial and treemap views, SSH/cloud sources, and Git-aware development cleanup. Its separate CLI adds terminal maps and JSON/NDJSON reports. All direct Mac features are free with reminders; the app sends anonymous usage telemetry.
Price
Direct Mac edition free with reminders; optional $9.99 one-time personal license or team seat removes reminders. App Store terms are separate.
Platform
Mac app: macOS 14+; CLI: macOS, Linux, Windows
Consider
Desktop GUI requires macOS 14+; Linux/Windows use the separate CLI
Selections compare documented features and the job described in this guide. We did not run a common benchmark, assign performance scores, or audit every app’s code. Official sources appear under “Sources and how we compare.” Requirements and prices can change.
Common questions
Does deleting a 20 GB file recover 20 GB?
Not necessarily. Logical size can exceed allocation; shared blocks, other hard links, snapshots, and Trash can retain storage. Confirm actual free capacity after cleanup.
Can I delete Docker.raw or a photo library?
Do not remove either just because it is large. A Docker disk image may contain volumes and databases; a photo library may hold originals. Use the owning application’s management tools and a verified backup.
How fast will a scan finish?
It depends on item count, filesystem, source latency, permissions, and cache state. This guide has no cross-product timing measurements.