Is NotchStar Disk cleanup safe?
Yes, within limits. The Disk tab only ever moves things to the Trash, never deletes them for good, and every move passes through one check that refuses anything but your own files. Safe here means recoverable, not that every item is worth removing.
What the check allows
- Things inside your home folder, at least two levels down. Your home folder itself, and top level folders such as Documents and Desktop, are refused.
- Inside
Library, only what is inside folders such as Caches or Preferences, never those folders themselves. - App bundles directly inside
/Applications.
Everything else is refused, including system paths. The check is in one small file, DiskSafety.swift, with tests.
What is safe to clear, by group
| Group | Verdict | What happens if wrong |
|---|---|---|
| App caches | Generally safe | The app is slower once while it rebuilds |
| Logs | Safe | Nothing, unless you wanted an old log |
| Xcode build data | Safe | The next build is a full build |
| Old downloads | Look first | You download it again, if it is still online |
| Duplicates | Safe if you want the oldest kept | The oldest copy stays |
| Apps and leftovers | Your call | Settings and data for that app go to the Trash |
Old downloads and app data are your files, so read the list before you tick it.
Habits that keep it safe
Quit an app before clearing its cache. Do not empty the Trash for a day, in case something misbehaves. The Trash step explains why that works. For the places on a Mac that no tool should touch, read the full guide, and for the whole tool see the Disk feature page.
