You can use to verify the startup disk and the structure of its system files

OnyX for Mac

OnyX 4.0.0

  -  4.93 MB  -  Freeware
  • Latest Version

    OnyX 4.5.9

  • Operating System

    macOS 11.0 Big Sur or later

  • User Rating

    Click to vote
  • Author / Product

    Titanium Software / External Link

  • Filename


  • MD5 Checksum


Sometimes latest versions of the software can cause issues when installed on older devices or devices running an older version of the operating system.

Software makers usually fix these issues but it can take them some time. What you can do in the meantime is to download and install an older version of OnyX 4.0.0.

For those interested in downloading the most recent release of OnyX for Mac or reading our review, simply click here.

All old versions distributed on our website are completely virus-free and available for download at no cost.

We would love to hear from you

If you have any questions or ideas that you want to share with us - head over to our Contact page and let us know. We value your feedback!

  • OnyX 4.0.0 Screenshots

    The images below have been resized. Click on them to view the screenshots in full size.

    OnyX 4.0.0 Screenshot 1
  • OnyX 4.0.0 Screenshot 2
  • OnyX 4.0.0 Screenshot 3
  • OnyX 4.0.0 Screenshot 4

What's new in this version:

- Code optimized
- Deleting the applications caches improved
- Info > Security pane (formerly Protection) improved
- Deleting the diagnostic reports improved
- Issue corrected that occurred when deleting the Recent Items in the Apple menu
- Miscellaneous improvements made
- Help updated, improved, and reindexed