CCleaner for Mac: what it does, and the honest alternative

CCleaner for Mac still exists. There is a free version, a Professional tier listed at $44.95 on CCleaner's own Mac download page (checked 8 August 2026), and the Mac build was last updated on 19 June 2026, so it is not an abandoned product. It is not malware.

On macOS it is a much smaller tool than the one you remember from Windows. Most of what made CCleaner famous on a PC has no equivalent here.

If you want a duplicate finder, an app uninstaller and a startup-items manager in one window at no cost, the free tier does those jobs and is a fair download. If you are here because your Mac feels slow or full and you assume a registry clean is the fix, you need something else, and possibly nothing at all.

The Windows habit that doesn't transfer

Windows keeps a registry. Microsoft describes it as "a hierarchical database that contains data that is critical for the operation of Windows and the applications and services that run on Windows." Every installed program writes into it, and uninstallers leave things behind in it. Sweeping that database is CCleaner's original job and the source of most of its reputation.

macOS has nothing like it. App settings live in per-app property list files in the Library folder in your home directory, or, for sandboxed apps, inside that app's own container. A leftover preference file is a few kilobytes sitting in a folder. There is no shared configuration database to corrupt, nothing to defragment, and no registry pass that makes a Mac faster.

On a Mac, CCleaner does file cleanup: caches, downloads, duplicates, unused apps, startup items, browser data. Those jobs are worth doing. They are also mostly jobs macOS or a free utility will do, and none of them are the one you installed it for on Windows.

What CCleaner for Mac actually does

From CCleaner's own Mac page, checked 8 August 2026, the free tier covers four things: clean unwanted clutter, find duplicate files, uninstall redundant apps, manage startup items. Professional adds Analyze Photos (it finds "blurred, poorly lit, or similar-looking" images), automatic browser cleaning on a schedule, bookmark import, and automatic Trash emptying. Professional Plus bundles the Windows and Android versions and covers three devices instead of one.

Check two things before paying. CCleaner's paid licenses are annual subscriptions that renew on their own; the company's support pages say a license is "renewed automatically (or 'extended' for another year) at the end of your license term." And the system-requirements list on the Mac product page stops at macOS 13 Ventura, while the download page says 64-bit macOS 10.10 and above. On a recent Mac, confirm compatibility before you spend anything.

The history, stated precisely

Two episodes come up whenever CCleaner is discussed. Both get stretched in one direction or the other, so here they are with dates attached.

In September 2017, Cisco Talos found that the legitimate, signed version of CCleaner 5.33 being distributed by Avast also carried a multi-stage malware payload. Piriform's own notice is titled "Security Notification for CCleaner v5.33.6162 and CCleaner Cloud v1.07.3191 for 32-bit Windows users." The affected builds were Windows builds. The tainted files were downloadable from 15 August 2017, a clean 5.34 shipped on 12 September, Talos reported it on 13 September, and Avast put the number of affected machines at 2.27 million. Nothing in the technical write-ups touches a Mac build. That was nine years ago and it was remediated, so treat it as context, not a live warning.

The second episode is about browsing data. In June 2024 the FTC finalized an order requiring Avast to pay $16.5 million and banning it from selling, disclosing or licensing web browsing data for advertising. The FTC alleged Avast collected browsing information "through the company's browser extensions and antivirus software," stored it indefinitely, and sold it to more than 100 third parties through its subsidiary Jumpshot. The order names Avast's antivirus and its extensions. It does not name CCleaner. It still matters here, because CCleaner sits in the same corporate family (Avast acquired Piriform in 2017, and Avast merged into what is now Gen Digital in September 2022), and because any cleaner asks for wide access to your machine.

None of that makes CCleaner malware, and the "all cleaner apps are scams" line is lazy. What it does justify is reading what a cleaner does with your data before you grant it Full Disk Access, whatever the brand. Are Mac cleaners safe? works through the category properly, and is CleanMyMac safe? does the same for the other big name.

Try macOS first

Open System Settings, then General, then Storage. Apple's own recommendations live there: Store in iCloud, Optimize Storage, and emptying the Trash automatically after 30 days. Caches mostly look after themselves, which is why Apple describes safe mode as clearing "certain system caches, which are automatically created again as needed." They come back on purpose. Clearing app caches buys you space for a while, not for good, and a lot of what looks alarming is explained by what System Data actually is.

For many people that is the entire answer, which is why do you need a Mac cleaner at all? is the honest first question. If you decide you want one, which Mac cleaners are actually free goes further than most people expect, and the roundup of paid options covers the rest.

Where Plumby fits

Plumby sits in the same show-and-decide tradition, with a stricter rule about what it will tell you.

Every file it proposes to remove is listed with its full path and a checkbox beside it, and the commit is a press and hold rather than a button a stray Return key can trigger. Sizes are re-read at the moment of deletion, so the total you see afterwards is what left the disk rather than what the scan guessed.

It finds byte-identical duplicates, files you have never opened, files untouched for over a year, and the big folders behind them. It uninstalls apps together with their leftovers, and where a match rests on nothing more than a similar name it says so and leaves the call to you. Login and startup items sit in the same app, which is usually why a Mac is slow to boot, and uninstalling an app completely stops being a manual hunt through your Library folder.

It also watches the machine while you use it: CPU and free memory in the menu bar, and a popover with memory pressure, storage, network, battery, temperature and backup status. Nothing goes anywhere. There are no analytics SDKs in the app and no account to create, just a license key you paste in.

Where it stops matters too. Plumby is not an antivirus and never claims to be. It does not clear browser history or cookies, and it will not grade your photos. If those are the CCleaner features you use, keep them.

Which to pick

If you came from Windows expecting a registry clean, install nothing yet. Open Storage in System Settings, empty the Trash, and see where you land.

A free duplicate finder and uninstaller in one window is a fair thing to want, and CCleaner's free tier gives you that. So do the tools in the alternatives to CleanMyMac and to MacKeeper.

And if you want the cleanup with the reasons attached, every path shown before anything moves and a number afterwards you can check, that is what Plumby is for.