Kleanse vs OnyX

Last updated September 20, 2026

OnyX by Titanium Software is a free maintenance utility. OnyX is a free maintenance utility for macOS: verify system files, rebuild caches and databases, clean logs, and run many system tasks. It is powerful but technical, with no app uninstaller, disk map, monitor, or menu bar.

Kleanse is an all-in-one, review-first Mac maintenance app for $9.99 once, with every future update included. This page compares the two so you can pick the right tool for your Mac.

Choose OnyX if

You want a free, advanced maintenance toolbox.
You are comfortable with low-level system tasks.
You do not need a cleaner UI or app management.

Choose Kleanse if

You want a safe, guided, review-first cleanup.
You want app uninstalling and disk analysis.
You want live monitoring and a menu-bar HUD.

OnyX vs Kleanse, feature by feature

Kleanse compared with OnyX
Feature	Kleanse	OnyX
Cache & junk cleanupKleanse scans ten categories of caches, logs, and clutter and only removes what you approve.	Yes	Yes
App uninstall with leftoversKleanse previews an app's support files, caches, and preferences before removing them.	Yes	No
Visual disk mapKleanse has a clickable, squarified treemap you can drill into.	Yes	No
Largest-files finderKleanse lists the biggest files with sizes and paths, and can reveal or trash them.	Yes	No
Maintenance / optimize passKleanse restarts everyday services and rebuilds caches like Quick Look and Launch Services.	Yes	Yes
Live system monitorKleanse shows CPU, memory, disk, network, GPU, thermal, and battery with a health score.	Yes	No
Menu-bar HUDKleanse shows vitals and top processes from the menu bar without opening a window.	Yes	No
Review every item firstIn Kleanse, a scan never deletes anything; you approve candidates item by item.	Yes	Partial
Reversible removals (Trash)Kleanse sends removals to the Trash by default so you can restore them.	Yes	Partial
No subscription requiredKleanse is a one-time $9.99 lifetime license with every future update included.	Yes	Yes

Price over time

App	Price model	First year	5 years
Kleanse	$9.99 one-time, all updates	$9.99	$9.99
OnyX	Free	$0	Free

List prices for one Mac, taken from Titanium Software’s own pages on September 20, 2026. Prices change often and vary by region and promotion.

Where OnyX is strong

Completely free (donationware).
Deep macOS maintenance and verification tasks.
Trusted by advanced users for years.
No subscription and no account.

Where Kleanse is different

Kleanse is free to try and $9.99 to own, with a friendly review-first UI, app uninstall, disk map, monitoring, and a menu bar. OnyX remains the free choice for deep, technical maintenance.

Technical interface; easy to misuse if you run tasks you do not understand.
No app uninstaller, disk visualizer, largest-files list, monitor, or menu bar.
No review-first workflow for reclaiming user space.
Coverage for the newest macOS releases can lag.

OnyX vs Kleanse: common questions

Is OnyX a good free alternative to Kleanse?

OnyX is free and excellent for advanced maintenance, but it does not clean user caches through a review list, uninstall apps, visualize disk space, monitor your system, or live in the menu bar. If you want a guided, review-first clean, Kleanse is free to try and $9.99 once.

Is Kleanse free?

Kleanse is free for one day on each Mac. After that, a one-time $9.99 lifetime license keeps it unlocked with every future update.

Is OnyX safe?

OnyX is a long-standing, widely used maintenance tool, but it exposes advanced system tasks. Read the documentation and back up first before running anything you do not understand.

Sources

OnyX product page

Trademarks belong to their owners. Kleanse is not affiliated with, and was not endorsed by, Titanium Software.

Try Kleanse

Download it free and use the full app for a day. Then one $9.99 lifetime license covers this Mac and every future update, with no subscription.