Tidy MacPick OnyX if you are comfortable with maintenance scripts, cache rebuilds and hidden system settings, and want them free. Pick Tidy Mac if your goal is to understand and safely shrink System Data: it explains each part, sorts junk by safety, cleans to the Trash with undo, and shows your free-space trend in the menu bar.
Side by side
| Feature | Tidy Mac | OnyX |
|---|---|---|
| Plain-English explanation of System Data | Yes | Not a focus |
| Junk sorted by how safe it is to clear | Yes | No |
| Maintenance scripts and hidden settings | No, by design | Yes |
| Moves to the Trash first, with undo | Yes | Deletes as part of maintenance tasks |
| Free-space trend and low-space alerts | Yes | No |
| App uninstaller with leftovers | Yes | No |
| Price model | $9.99 once, 2 Macs | Free |
Based on OnyX’s public website, October 2026. Prices and features change; tell us if something is out of date.
Who should pick which
Pick OnyX if…
- You want free maintenance scripts and hidden system settings
- You know what each option does and want full control
- You don’t need explanations
Pick Tidy Mac if…
- You want to know what is using space before changing anything
- You want clear safety triage instead of technical checkboxes
- You want a heads-up before your disk fills
About OnyX
OnyX by Titanium Software is a free utility that runs macOS maintenance tasks, rebuilds caches and indexes, and exposes many hidden settings. Each macOS version needs its matching OnyX version.
Get Tidy Mac
See what fills your Mac, System Data included. $9.99 once, on two Macs, with everything going to the Trash first. Use both tools if you like.