OnyX
OnyX is a macOS maintenance utility that helps users verify system files, clean caches, adjust system settings, and rebuild databases from one interface.
What is OnyX?
OnyX is a native macOS utility for maintenance, cleanup, and system customization. It helps Mac users run routine maintenance tasks without relying on Terminal commands, making it useful for people who want a graphical way to manage common system housekeeping jobs. With OnyX, you can verify parts of the startup disk and system file structure, clear caches, rebuild databases and indexes, uninstall apps, and change settings in Finder, Dock, Safari, and some Apple apps. The app is aimed at advanced home users, support staff, and anyone comfortable making system-level changes on a Mac. Titanium Software provides separate OnyX versions for specific major macOS releases, so using the edition that matches your macOS version is important for proper operation.
Key features
- Verify the startup disk and system file structure
- Run maintenance and cleanup tasks from a graphical interface
- Delete application, font, and system caches
- Rebuild databases and indexes used by macOS
- Adjust settings for Finder, Dock, Safari, and some Apple apps
- Uninstall applications and related files
- Access advanced maintenance actions without Terminal commands
Review app leftovers with diCleaner
Inspect caches, support files, containers, and login items before cleaning.
Safety overview
Status: Use with caution
OnyX is a legitimate macOS utility from Titanium Software, but it works with maintenance functions and hidden system settings that can affect how macOS behaves. Some actions remove caches, rebuild indexes, or change Finder, Dock, Safari, and other Apple app settings, so it is best used by people who understand the changes they are making. Use the version made for your exact major macOS release, and review maintenance or cleanup options before running them.
Recommendation: Keep OnyX if you use it for Mac maintenance, troubleshooting, or system customization. If you do not use these tools, you can remove it without affecting normal macOS operation, though any settings you changed with it may remain until you change them back.
Common paths
/Applications/OnyX.app
Preference paths
~/Library/Preferences/com.titanium.OnyX.plist
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