OnyX for Mac
Maintenance scripts, cache rebuilding and hidden macOS settings in one classic utility.
by Titanium Software
Free download · macOS · version matched to your macOS release · Updated
- 3.8K Ratings
- 4.5
- Price
- Free 100% free
- Category Cleaning
- Developer Titanium Software
- License
- Free Freeware
- Platform macOS
What OnyX Does
Verify the startup disk
Check the structure of your system volume before running maintenance tasks.
Rebuild system caches
Rebuild databases such as Spotlight and LaunchServices when search or “Open With” menus misbehave.
Clean caches & logs
Remove system, user and application caches and old logs that pile up over time.
Hidden parameters
Adjust Finder, Dock, Safari and other options that macOS does not expose in System Settings.
Maintenance scripts
Run the periodic maintenance routines macOS normally schedules in the background.
Made per macOS version
Each OnyX release is built for a specific macOS version, so it matches your system exactly.
About OnyX for Mac
OnyX is a long-running free maintenance utility for macOS from Titanium Software. It brings together tasks that are otherwise scattered across Terminal commands: verifying the startup disk, running maintenance scripts, rebuilding system databases and cleaning caches and logs.
It is particularly useful when something on your Mac feels off — Spotlight returns wrong results, the “Open With” menu shows duplicates, or the Finder behaves oddly. Rebuilding the relevant caches with OnyX often fixes these issues without reinstalling anything.
OnyX also includes a Parameters section with dozens of hidden settings for Finder, Dock, Safari, screenshots and more. Because every release targets a specific macOS version, always use the OnyX build that matches the macOS installed on your Mac.
User Reviews
Leave a commentAverage score from people who use OnyX on their Mac. Tap the stars below to add yours.
What we like about OnyX
Fixes the weird stuff
Editors’ note
Broken Spotlight results or duplicate “Open With” entries often disappear after rebuilding caches.
Hidden settings unlocked
Editors’ note
Tweak Finder, Dock and screenshot options without touching Terminal.
A trusted classic
Editors’ note
Built and updated for every macOS release for many years.
How to Run Maintenance with OnyX
-
1
Choose the right version
Download the OnyX build made for your macOS version and move it to Applications.
-
2
Allow access
On first launch OnyX asks for your password and may ask to verify the startup disk — let it finish.
-
3
Select tasks
Open Maintenance and tick the scripts, caches and rebuild tasks you want to run.
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4
Run & restart
Click Run Tasks. When it finishes, restart your Mac so the rebuilt caches take effect.
How to Download & Install OnyX on Mac
- Download — tap Free Download to get the OnyX installer.
- Open — double-click the downloaded ZIP or DMG in your Downloads folder.
- Install — drag OnyX into the Applications folder.
- Launch — if macOS warns you on first launch, go to System Settings → Privacy & Security → Open Anyway.
Is OnyX Safe?
Yes — OnyX is a safe app for Mac when you use the version made for your macOS. It is a respected freeware utility that only runs the tasks you select, and it asks for confirmation before changing system settings.
We never repack or modify installers. You can verify this page and its download yourself with independent security scanners:
- Freeware with no ads or bundled extras
- Runs only the tasks you choose
- Release matched to your macOS version
Information
- Developer
- Titanium Software
- Category
- Cleaning & Maintenance
- Price
- Free
- License
- Freeware
- Compatibility
- macOS · version matched to your macOS release
- User rating
- 4.5 out of 5 (3.8K ratings)
OnyX FAQ
Yes. OnyX is freeware from Titanium Software.
Use the version built for your macOS release. Each OnyX version supports one macOS version.
It does not magically speed up a healthy Mac, but rebuilding caches and running maintenance can fix slow or buggy behavior caused by corrupted caches.
Yes, when used for your macOS version and with the default task selection. See the safety check above for scanner reports.
