OnyX is a multifunction utility for Mac OS X which allows you to verify the startup disk and the structure of its System files, to run misc. tasks of system maintenance, to configure some hidden parameters of the Finder, Dock, QuickTime, Safari, Mail, iTunes, login window, Spotlight and many of Apple’s applications, to delete caches, to remove a certain number of files and folders that may become cumbersome, and more.
There is a specific version of OnyX for each major version of the operating system.
Use the specific version, and don’t try to use a non-compatible version.
Download: OnyX 3.4.6 for macOS High Sierra 10.13
OnyX 3.4.5 for macOS High Sierra 10.13
OnyX 3.4.3 for macOS High Sierra 10.13
OnyX 3.3.1 for macOS Sierra 10.12
OnyX 3.1.9 for OS X El Capitan 10.11