OnyX

OnyX is a popular freeware utility for macOS developed by French developer Joël Barrière that is compatible with both Intel processors and Apple silicon (previous versions supported PowerPC). As a multifunctional tool for maintenance and optimization, it can control many basic Unix programs already built into macOS, including setting hidden preferences otherwise modified by using property list editors and the command line. Features Verify the structure of the file system on the start-up volume Repair disk permissions Configure certain parameters hidden from the system and from certain applications Empty System, User, Internet, Font caches Force Empty the Trash Rebuild Launch Services, CoreDuet database, XPC Cache... Rebuild Spotlight and Mail indexes Development Created in 2003 by Joël Barrière, a.k.a. Titanium, the program was originally meant to address its creator's personal needs. Developed using Xcode, Apple's software development environment (Cocoa + AppleScript Studio + Objective-C), OnyX is regularly updated by its author taking into consideration users' suggestions and requests. To do its job, the program uses macOS's standard Unix utilities, allowing their control through a graphical user interface without needing the command line. Versions OnyX versions are specific to each version of macOS and are not backward compatible. The program will not work correctly if used with an OS for which it was not designed.