Onyx 15
Onyx 15


Since 2003, Titanium Software has been issuing its free system maintenance and tweaking utility, Onyx for every major release of macOS. Currently there is a mature version of Sonoma and a beta version of Sequoia, although you can still download versions going all the way back to Jaguar, Mac OS 10.2. 

The current version of Onyx features a whole suite of features:

  • Verify The Structure of the System Files 
  • Run Miscellaneous Maintenance and Cleaning Tasks
  • Configure Parameters in The Finder, Dock, Safari, And Some Apple Applications
  • Delete Caches
  • Remove Certain Problematic Folders and Files
  • Rebuild Various Databases and Indexes

Dock Parameters
Dock Parameters


A few other things you can do include:

  • Delete old media libraries and Xcode files
  • Access all of the UNIX man files on your system
  • Granular wake, sleep and shut down controls
  • Provide easy access to hidden system utilities like Directory Utility and Wireless Diagnostics
  • Change the visibility of files, folder and applications
  • See status and toggle security tools like Gatekeeper and Firewall
  • Advanced file finding
  • Info and reports on hardware, memory, volumes and software

Onyx is signed by Titanium Software and notarized by Apple. It is available for downloading from the developer's website.