Is MacKeeper safe? Its history, what it is today, and whether you need it

Is MacKeeper a virus or malware?

No. The version sold today is a signed, notarized app from an identifiable company, and independent testers treat it as a security product, not a threat. Apple's own description of notarization is precise: an app that has been notarized "indicates that Apple checked it for malicious software and none was detected." MacKeeper has passed that check since 2020.

The confusion is understandable, because for several years the answer was murkier. Many antivirus tools once flagged MacKeeper 3 as a potentially unwanted program, and older Apple Community threads are full of people asking how to get rid of it. Those threads are about a different era of the product, and a different set of practices, which the next sections lay out with sources.

So there are really two questions hiding in "is MacKeeper safe". Will it harm your Mac? The evidence says no. Is it something a normal Mac user needs to pay for? That is where most experienced users still say no, and the reasons have little to do with malware.

Why does MacKeeper have such a bad reputation?

MacKeeper's reputation was built in its first five years, and the record is well documented.

Advertising. In 2015 PCWorld reported that Kromtech, then the owner, bought "upwards of 60 million ad impressions a month", much of it as pop-ups across the web. Affiliates were paid a large commission, and some bundled MacKeeper promotion into adware. Kromtech told PCWorld it had suspended most of the affiliate agreements it inherited and set up a compliance team to vet new ones.

Scan results. The same PCWorld report described a test by AV-Comparatives on a fresh, fully updated copy of OS X Yosemite: MacKeeper rated the brand-new system's state as "serious", largely because of unused language files, and offered to fix the rest only in the paid version. That pattern, alarming results on a clean Mac, is the root of the "scareware" label. Security journalist Brian Krebs described MacKeeper in 2015 as a "much-maligned" utility that many consider "little more than scareware".

The class action. A suit filed in 2014 in the Western District of Pennsylvania accused ZeoBIT, the original developer, of deceptively advertising the program and making false claims about what it could fix. In August 2015 ZeoBIT agreed to a settlement that created a refund fund for US buyers, and, as PCWorld noted, ZeoBIT admitted no fault as part of the agreement.

The data exposure. In December 2015 security researcher Chris Vickery found a Kromtech database open to the internet holding more than 13 million MacKeeper customer records: names, products ordered, license details, IP addresses and account usernames with password hashes. Kromtech said it fixed the error within hours and that billing information was not stored on those servers.

None of this makes the 2026 app dangerous. It does explain why forum regulars still react to the name the way they do.

Who owns MacKeeper now, and what changed?

MacKeeper has changed hands twice. The dates below come from contemporary reporting and Howard Oakley's notarization checks.

Whether the ownership change was a real break is still argued. A 2021 update on Michael Tsai's blog quoted tech writer Lance Whitney saying the new owner had "pulled back on the aggressive marketing schemes and rid itself of dubious affiliates." Mac security researcher Thomas Reed, quoted in the same post, disputed the framing: "Calling Clario a 'new owner' is a bit of a stretch," noting that Clario's executives had been Kromtech's. Both observations can be true at once: the people overlap, and the product and marketing changed.

What do independent testers say about MacKeeper today?

AV-TEST, the German lab that tests Mac antivirus products, lists MacKeeper as certified in every round it entered from December 2020 to March 2025, with top or near-top scores for protection, performance and usability. That is a real change from its June 2017 entry, when MacKeeper 3.14 scored zero for protection and received no certificate.

Howard Oakley, who writes the Eclectic Light Company blog and is no fan of housekeeping apps, examined the 2020 release closely. His conclusion: "The current version of MacKeeper is, as Clario claims, properly and completely notarized." He found no sign of the unwanted behavior linked to older versions and described it as what it claims to be, a combined housekeeping, anti-malware and privacy app. He also said plainly that he would not use it himself.

What it bundles today. MacKeeper's own site lists a cleaner, uninstaller, duplicate finder, memory cleaner, antivirus, adware cleaner, VPN, ad blocker and data-breach monitoring. The antivirus and VPN are the parts with independent test results behind them. The memory cleaner and optimizer are the parts with the least to show, for the reasons covered in memory cleaner apps.

In short, testers now judge MacKeeper as a competent security suite. None of them argue that a Mac needs one.

Does Apple recommend MacKeeper?

No. Apple does not recommend any third-party cleaner or optimizer. Notarization is often misread as approval, and MacKeeper's own site is careful to say it is not an app review: it is an automated scan for known malicious code. An app can pass it and still be something you do not need.

Apple Community regulars, who answer "my Mac is slow" questions all day, remain blunt. In a January 2025 thread titled "Trustworthiness of MacKeeper in 2025", one longtime contributor replied: "It was NEVER trustworthy." Another listed MacKeeper among apps that "should be removed as per Developers Instructions." That view is shaped by the history above and by a general position that cleaners add little to macOS. It is a strong opinion, and it is shared by most of the people who answer those threads.

The fair summary: Apple checks MacKeeper for malware and lets it run. Apple's own guidance on freeing space points to the built-in Storage settings, not to any suite.

Does a Mac need MacKeeper, or any cleaner?

Rarely. Each job MacKeeper sells has a built-in equivalent.

Malware protection. macOS runs XProtect and Gatekeeper silently and updates them in the background. A second scanner is reasonable if you download a lot of unsigned software; most people do not.

Memory. macOS keeps spare RAM full of cached files on purpose and compresses idle memory. A memory cleaner empties that cache, the number drops, and the Mac reads the files back from disk. There is nothing to gain.

Disk space. System Settings, General, Storage lists large files, old apps and recommendations. The free up space on Mac guide walks through it in order. The best Mac cleaner page names the few narrow free tools worth adding.

Privacy and VPN. These are real products, but a VPN is a separate decision from cleaning a Mac, and many people already get one elsewhere.

Speed. A slow, hot or loud Mac is almost always one process working hard, such as a browser tab, a sync client or Spotlight indexing. No cleaner tells you which. Activity Monitor does, and the why is my Mac so slow guide shows how to read it. Safe to Quit does the same from the menu bar in plain words, watching processes over hours and saying which one is the cause and whether it is safe to quit.

What to use instead of MacKeeper

1. Check storage with the built-in tool

   Open System Settings, General, Storage. Act on the recommendations, and click the i next to Applications or Documents to see the largest items sorted by size.

2. Empty the Trash and restart

   Control-click the Trash in the Dock and choose Empty Trash, then restart. A restart clears swap and any process that has been growing for days.

3. Review what starts with your Mac

   System Settings, General, Login Items and Extensions. Turn off anything you do not recognize or need. The background items guide explains the common entries.

4. Find the busy process if the Mac is slow

   Open Activity Monitor, sort the CPU tab and then the Memory tab, and look at what sits on top. That is the cause far more often than anything a cleaner would delete.

5. Add one narrow tool only for a real gap

   To uninstall apps with their leftovers, AppCleaner is free. To see where disk space went, use a disk map such as GrandPerspective. If you want an all-in-one anyway, read is CleanMyMac worth it before choosing.

6. If MacKeeper is installed and you want it gone

   Apple's advice is to use an app's own uninstaller when it has one, because that also removes its login items and extensions. Then check Login Items and Extensions to confirm nothing is left, and cancel any subscription separately: deleting an app does not cancel it.

Verdict: should a normal Mac user install MacKeeper?

Is it safe? Yes, in the technical sense. The current app is notarized, certified by an independent lab, and made by an identifiable company. Installing it will not infect your Mac.

Should you install it? For most people, no. Its useful parts, an uninstaller, a duplicate finder and a malware scanner, overlap with what macOS and free tools already do. Its memory and optimizer parts do not make a Mac measurably faster. And the company's past, a settlement over marketing claims and a large customer data exposure, is a fair reason for caution about handing it your Mac and your account details, even though both events are a decade old.

When it can make sense: you want antivirus, a VPN and a cleaner in one subscription with live support, and you have weighed that against the built-in tools. That is a legitimate preference, not a mistake.

If a pop-up told you to install it: do not. That advice applies to any app, and it is the rule Brian Krebs repeated in 2015: if you did not go looking for it, do not install it. Open the built-in tools first. Most people find their Mac was fine all along.