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OnyX Snow Leopard.png
OnyX Snow Leopard Screen Shot.png
OnyX running on OS X Yosemite with "Cleaning" pane open
Developer(s) Joël Barrière
Titanium Software
Stable release

2.9.6 (April 6, 2015; 14 months ago (2015-04-06)) [±]

2.8.8 (November 25, 2014; 19 months ago (2014-11-25)) [±]

Mountain Lion
2.7.4 (June 22, 2013; 3 years ago (2013-06-22)) [±]

2.4.8 (August 19, 2011; 4 years ago (2011-08-19)) [±]

Snow Leopard
2.3.0 (August 1, 2011; 4 years ago (2011-08-01)) [±]

2.0.6 (August 31, 2009; 6 years ago (2009-08-31)) [±]

1.8.6 (December 15, 2007; 8 years ago (2007-12-15)) [±]

1.5.3 (May 16, 2005; 11 years ago (2005-05-16)) [±]


1.3.1 (October 20, 2003; 12 years ago (2003-10-20)) [±]
Preview release 2.9.7 (April 1, 2015; 14 months ago (2015-04-01)) [±]
Operating system Mac OS X
Available in Multilingual
Type Utilities, Maintenance, Optimization
License Freeware
Website Titanium Software

OnyX is a popular[1] freeware utility for Mac OS X developed by French developer Joël Barrière that is compatible with both PowerPC and Intel processors. As a multifunctional tool for maintenance and optimization, it can control many basic Unix programs already built into OS X, including setting hidden preferences otherwise modified by using property list editors and the command line.[2]


  • 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


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 OS X's standard Unix utilities, allowing their control through a graphical user interface without needing the command line. OnyX is freeware.


OnyX versions are specific to each version of Mac OS X and are not backward compatible. The program will not work correctly if used with an OS for which it was not designed.

The El Capitan (10.11) build is actively maintained. However, all previous versions in support of past operating systems are still available for download from the developer's website.[3]

Version History[edit]

Color Meaning
Red Former official release
Green Current official release
Blue Current test release

See also[edit]


  1. ^ "OnyX (Mavericks) for Mac". CNET. Retrieved 2015-10-03. 
  2. ^ Loeb, Larry (2005-04-29). "OnyX: Make OS X Spill the Beans". Retrieved 2015-10-03. 
  3. ^ "OnyX download section". Retrieved 2015-10-03. 

External links[edit]