Disk Diag
Disk Diag is a macOS disk cleaning utility that scans common storage-heavy areas in your home folder and helps you remove unneeded files.
What is Disk Diag?
Disk Diag is a native macOS utility for finding and cleaning files that take up unnecessary space on your Mac. It is designed for users who want a guided way to review common storage-heavy areas without manually digging through Library folders and browser data. The app focuses on everyday cleanup tasks such as caches and logs, downloads, trash contents, large files, selected browser data, and app leftovers, with additional cleanup options for items like iOS software updates and Xcode-generated files. Newer versions are distributed through the Mac App Store and support current macOS releases. For people trying to recover local storage, reduce clutter, or understand where space is going in their home folder, Disk Diag provides a focused cleanup workflow in a small utility app from Rocky Sand Studio Ltd.
Key features
- Scan common storage-heavy areas in your home folder
- Clean caches, logs, downloads, and trash contents
- Review and remove large files taking up disk space
- Clear selected browser data during storage cleanup
- Find and delete application leftovers you no longer need
- Remove iOS software update files stored on your Mac
- Clean Xcode-generated files such as derived data and archives
Review app leftovers with diCleaner
Inspect caches, support files, containers, and login items before cleaning.
Safety overview
Status: Mostly safe
Disk Diag is a legitimate Mac cleaning utility, but cleanup tools can remove files that some apps may rebuild later or that you may still want to keep, such as downloads or browser data. It may request access to folders or Full Disk Access so it can measure and clean the locations you choose, which is normal for this kind of utility. Review the items it finds before deleting them, especially large files, downloads, and developer data.
Recommendation: Keep Disk Diag if you actively use it to free up storage or manage clutter on your Mac. If you do not use cleanup utilities, you can remove it without affecting macOS itself, though any convenience features it provides for finding removable files will no longer be available.
Common paths
/Applications/Disk Diag.app
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