Crumb

Crumb is a Mac menu bar app for a full disk. A read-only scan maps what is using your space: System Data, Xcode build data, developer caches, old iPhone backups, app leftovers and your biggest folders.

Every item gets a plain English note on whether it comes back on its own, and only the items you tick are removed. No account, and your files stay on your Mac.

The scan and one full cleanup are free. Crumb Pro is $9 once, with a 7-day money back guarantee.