The former is a system maintenance and cleaning utility for macOS that takes OnyX's maintenance functionalities and puts it into a separate app, while Deeper focuses on offering personalization options for macOS users, such as enabling or disabling the hidden functions of various apps and more. Titanium Software, his company’s website registered as a French domain, lists another two applications also developed by Barrière, Maintenance and Deeper. OnyX is freeware and the main application Joël Barrière has developed after the launch of OS X Jaguar, in 2003. Such controls include verifying the startup disk, running a range of miscellaneous and cleaning tasks, configuring various parameters, deleting caches, and listing all installed items included in the package files of applications that users have installed on their computer. Created by French developer Joël Barrière as a multifunctional tool for Mac optimization, OnyX lets you control many basic Unix programs already built into macOS. When it comes to maintenance, one of the most frequently mentioned applications among Redditors and longtime Mac users is OnyX. Specific version of OnyX for each major OS version.Lacks option to review files before deleting.No detailed data of reclaimed disk space.