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Computerworld described MacKeeper as "a virulent piece of software". French news outlet Le Figaro called MacKeeper a scam, and criticized its reliance on "fear". This was deemed scareware by cybersecurity journalist Brian Krebs. AV-Comparatives found that MacKeeper warned of "serious" issues on a brand-new clean copy of macOS, which could only be fixed by purchasing the program. Some versions of MacKeeper opened a critical security hole in customers' Macs Kromtech later issued a fix. Version 1 & 2 of the program received mixed reviews, with reviewers being divided as to the effectiveness of the software. Both Tom's Guide and MacWorld have published how-to guides for deleting the software. Business Insider recommended users avoid or uninstall the product. The official uninstaller " pieces behind", resulting in regular pop-ups to convince users to reinstall the app. Many antivirus programs classified MacKeeper version 3 as a potentially unwanted program or adware and prompted users to remove it. In 2019, a newly-founded company, Clario Tech, acquired Kromtech and MacKeeper. In December 2015, security researcher Chris Vickery found that MacKeeper customer data was unsecured and publicly accessible on the internet, exposing the emails, phone numbers, and other information of over 13 million MacKeeper users Kromtech rapidly secured the customer database. Kromtech was closely affiliated with Zeobit, and hired many former Kyiv-based Zeobit employees.

In April 2013, MacKeeper was acquired by Kromtech. A 2011 press release by Avira and ZeoBIT revealed that MacKeeper integrated Avira's antivirus scanning engine. MacKeeper was first released in 2010 by Zeobit. In 2015, the personal information of 13 million users was publicly accessible on the web. Some versions are difficult to uninstall, and some versions have been flagged as undesirable by other anti-virus programs. Zeobit settled a class action lawsuit accusing them of deceptive advertising and making false claims about MacKeeper's capabilities, and Kromtech unsuccessfully sued MacKeeper critics. MacKeeper has a troubled and litigious history. MacKeeper was developed by ZeoBIT, later acquired by Kromtech, and is currently owned by Clario Tech. MacKeeper is a cleanup utility for macOS. Chinese, Czech, Danish, Dutch, English, Finnish, French, German, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Spanish, Swedish, Turkish
