While it's unlikely you'll ever run into malware for the Mac, you may want to consider an antivirus tool anyway—if not to protect yourself, but to protect your Windows-using friends from any malware you may inadvertently send their way. We think that Sophos Anti-Virus for Mac is the best choice, and it's free.

1. Best Antivirus For Mac
2. Best Antivirus For The Mac
3. Best Virus Cleaner For Mac
4. Antivirus For Mac

Update: Our previous recommendation for Mac Antivirus was 'nothing.' We know many of you choose to use nothing, but we also know you don't come to the App Directory to not get any suggestions at all. Besides, malware is starting to become a bit more prevalent on the Mac, and even the safest browsing habits don't protect you completely. So, we now officially recommend Sophos as our Mac antivirus of choice.

Kaspersky Internet Security for Mac combines security and efficiency and does not have any negative impact on your Mac, so your device keeps performing at its best. Simple to Set up and Easy to Use Kaspersky Internet Security for Mac provides users with simplified security management that saves your time, effort and hassle. After all our testing and research, we feel Bitdefender Antivirus for Mac is the best antivirus protection for Mac users. It does a good job detecting and protecting against threats, including Windows malware.

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Sophos Anti-Virus for Mac

Platform: OS X (10.4+)
Price: Free
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Features

• Compact, easy-to-use interface that can be used for custom on-demand scans of files, folders, and drives, or scheduled, periodic full scans of your Mac.
• Also scans files on your Mac for known Windows malware, trojans, and viruses, and deletes or quarantines them so you don't risk spreading them to someone else via network share, USB drive, or email.
• Deletes or quarantines known threats, gives you the option to quarantine anything suspicious that may be a new threat or dangerous file.
• Runs quietly in the background, scanning emails, downloads, and any other files on access, stopping you from opening them before they can do any harm.
• Light on system resources while running in the background.
• Installs like any other Mac application, and uninstalls just as easily—no complicated packages or components to manage or configure.
• Sophos' 'Live Antivirus' feature updates your app the moment new threats are detected or found in the wild. The feature also performs real-time lookups to see if files accessed are in the SophosLabs database, even if they're unfamiliar to the app.
• Supports OS X up to 10.8 and back to 10.4, and is completely free for all versions.

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Where It Excels

Sophos actually has an excellent breakdown of the history of malware for the Mac going all the way back to 1982. The fact that the article exists should remind Mac users that while they're not the primary target for malware authors, they're by no means invulnerable. The size of the article however should issue some confidence that the risk—while present—is by no means critical.

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Sophos Anti-Virus for Mac stands out in a somewhat crowded field of Mac antivirus apps because it doesn't just scan your Mac's files and folders on demand, but it does it quietly in the background without tapping your already precious system resources in the process. The utility also keeps its own constantly-updating database of Windows viruses, trojans, and other threats, so if you inadvertently download a Windows virus or trojan that won't harm you, you don't run the risk of sending it off to someone else by forwarding the message, or you won't infect other computers on your network (or any Windows partitions or virtual machines you run on the same hardware) via shared drives. Sophos is smart enough to tell you 'Hey, this won't hurt you, but we're going to quarantine/delete it so you don't accidentally email this attachment to someone else.' That's a huge benefit—and it keeps you from being that guy no one likes.

Another banner feature Sophos offers that its competition doesn't is its live, real-time access to SophosLabs. 'Live Antivirus,' as it's called in the app, gives you an added layer of protection. The app automatically identifies and quarantines suspicious files, installers, and other packages that may not be well known threats yet, but definitely exhibit behavior suspicious enough that Sophos is looking into them.

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Best of all though, in our testing, Sophos was one of the most resource-light antivirus apps on the Mac, which is impressive considering the features it offers.

Where It Falls Short

Sophos Anti-Virus for Mac isn't perfect, however. Even though it's pretty resource light, it wasn't the lightest in our tests. It just hit the sweet spot between resources and features. Also, support for Mountain Lion came a few months after its launch, so Sophos wasn't exactly right there with those people who upgraded on launch day.

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The Competition

ClamXav 2 uses the open source ClamAV virus scanning engine. It can also detect both WIndows and OS X malware, scan on demand or on a regular schedule, and it's probably a bit more lightweight and easy on system resources than Sophos. It's compatible with OS X 10.5 or higher. The only trouble with ClamXav is that its definitions come a bit more sporadically than we'd like (daily, usually, sometimes, if they feel like it) and while performing scans is easy, tweaking all of the settings and getting the app scanning proactively is a little more effort than I'd like to see. Still, it's an excellent alternative, and one of the first you should check out if Sophos isn't cutting it for you.

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Avast! Free Antivirus for Mac is the Mac version of our current favorite for Windows, and for good reason. The researchers at AV Comparitives found that Avast detected 100% of the Mac malware that went through it, an honor that few other utilities won (they didn't test Sophos, unfortunately). It's free, it works, it's lightweight, but the only catch is that it only scans for Mac-specific malware, which won't matter to you if you're in an all-Mac ecosystem, but if you, like most of us, share the world with Windows users, thinking of them doesn't hurt.

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Avira is another free utility worth a look. It also picked up 100% of the Mac malware that passed through it with no false positives. Avira's UI and options are perfect for non-technical users, and it offers strong protection against known Mac threats. Again, there's no Windows protection in the app, and both the scheduling and custom scan options are a bit anemic, so power users may want to shy away from it. If you're installing it on your non-technical friend or family-member's Mac however, it's a great option.

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For more suggestions, make sure to check out AV Comparitives' full 2012 report on Mac antivirus tools—there are more in there we didn't list here.

We're not trying and settle the antivirus-versus-no-antivirus debate; it's been raging for years and isn't going to stop now. For a great and thorough perspective on the issue, check out my old colleague Neil Rubenking's take at PC Mag's SecurityWatch blog, and The Safe Mac's approach to the topic.

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Whatever you do though, it's probably not necessary to plop down money for a Mac antivirus suite. The threats don't warrant you dropping money on software to keep you safe, and too many of them do more harm than good (especially the ones looking to get your money). They're just not worth it, especially when there are more effective, robust, free options like the ones above available to you.

Bitdefender Antivirus Plus

Superior protection, low system impact

Kaspersky Internet Security

Most everything you need

Kaspersky Total Security

Still top of the class

Plenty of Windows users believe they don't need to pay for antivirus software. Many Mac and Android users think they don't need protection at all. Windows' high profile makes it the biggest target, but macOS and Android are also vulnerable to malware, even if they don't encounter as much of it.

We believe it's worth paying for Windows antivirus software, because even the best free software leaves out some protection features we consider essential. But you don't have to spend a lot. Many antivirus products are sold online for much less than their list prices. Mac and Android users have other options: Some of our favorite Mac AV products cost nothing, and most Android security apps have free versions.

Different Types of Antivirus Software

Latest Security Alerts and Threats

—The Android PDF-creation app CamScanner was corrupted with adware, despite being in the Google Play app store. CamScanner's developers may not have been aware. ADVICE: Delete CamScanner from your Android device until a new version appears in the Play Store, and run Android antivirus software.

—Spammers have been sending emails to inject scam or malicious messages in regular people's Google Calendar pages. ADVICE: Follow our instructions to stop phony Google Calendar notifications from happening to you.

—Diagnostic software loaded onto most Lenovo Windows computers made between 2011 and 2018 could be used to hijack a PC. ADVICE: Uninstall Lenovo Solutions Center from your Lenovo PC., and run Windows antivirus software.

How We Tested

Our evaluations were based on an antivirus product's interface, performance, protection and extra features. Was the interface intuitive and user-friendly? How badly did malware scans slow performance? How well did the program detect and remove malware? Does the program have any additional tools, and are they useful?

All of our Windows tests were performed on the same Asus X555LA laptop running 64-bit Windows 8.1 (later upgraded to Windows 10), with an Intel Core i3 processor, 6GB of RAM and a 500GB hard drive containing 36GB of files. To assess a program's impact on system speed, we used our custom OpenOffice benchmark test, which matches 20,000 names and addresses on a spreadsheet. The longer it took the laptop to finish the test, the heavier the performance impact. For smartphones, we used the Geekbench 3 benchmarking app.

Our Mac evaluations were conducted on a late-2013 MacBook Pro running OS X El Capitan 10.11. The Mac had a 2.6-GHz Intel Core i7 CPU, 8GB of RAM and 23GB of data on a 512GB SSD. For Android, we used a Nexus 6P smartphone running Android 6.0.1 Marshmallow.

Best Antivirus For Mac

For malware-detection scores, we've used the results of four independent testing labs: AV-TEST in Germany, AV-Comparatives in Austria, SE Labs in England and our own labs in Utah. Each lab subjects the major antivirus brands' products to stress tests involving thousands of pieces of malware, including hundreds of previously unseen samples.

Windows Antivirus Software Types

Most antivirus makers have three or four tiers of Windows products, with each price bump adding extra features, such as parental controls or cloud backups. But because each company uses a single malware-detection engine for all its Windows antivirus software, the cheapest item — even a free one — in any product line usually finds malware just as thoroughly as the priciest.

Not all users will need premium suites, or even midrange products. If you don't have kids, or if you already have backup software, the basic product may be enough.

MORE: How to Buy Antivirus Software

Basic or Entry-Level Windows Antivirus

The least-expensive paid Windows antivirus products, which generally list from $40 to $60 per year depending on the number of PCs covered, have the essentials. Definition updates and scans are automatic; websites and email attachments are screened, and the products are mostly easy to use. Some basic AV programs toss in extra features, such as file shredders or system optimizers, that are normally found in pricier products.

Best Basic Antivirus Product

Reasons to Buy

Reasons to Avoid

Not only does Bitdefender Antivirus Plus have nearly perfect malware-detection scores, but it also offers great value, with a strong selection of extra tools. You'll find a built-in password manager, a secure browser, VPN client software, protection against encrypting ransomware and automatic profiles that optimize Bitdefender's impact on your system, depending on whether you're working, watching a movie or playing a game.

Midpriced Windows Antivirus

These products usually list from $60 to $80 per year. They generally build on the basic packages by bundling in parental controls and a two-way firewall to catch outgoing data, although many add other features. But for the full feature set each brand offers, you'll have to pony up for the premium products.

Best Midrange Antivirus Product

Reasons to Buy

Kaspersky takes first place among midrange antivirus software products, thanks to its excellent malware protection, a moderate system-performance impact and a full assortment of extra features and tools. Kaspersky Internet Security includes a secure browser, a virtual keyboard, specialized protection against ransomware, webcam protection to guard your privacy and VPN client software that automatically switches on when you connect to an unsafe Wi-Fi network.

Premium Windows Antivirus

Top-tier packages are often called suites because they do much more than catch malware. They might also offer file encryption, secure online storage, a password manager or an ad blocker. As most suites cover multiple devices, they also frequently bundle in licenses for Mac and Android antivirus software. For all this, you're meant to pay between $80 and $100 per year — but as with all paid antivirus software, steep discounts can often be found online.

Best Premium Antivirus Product

Reasons to Buy

Best Antivirus For The Mac

Kaspersky Total Security has it all for those who want more than just excellent malware detection. This one rose to the top because it eliminates threats without generating many annoying false positives. We also like the included secure browser, which is ideal for online banking and shopping. Other highlights include a thorough file shredder and Windows backup and recovery software.

Free Windows Antivirus

Free Windows antivirus products have gotten much better, and our top two choices offer excellent malware detection, if little else. The others provide adequate protection with a smattering of goodies such as password managers or parental controls. Among those is Microsoft's built-in Windows Defender, which has risen to the middle of our rankings. However, free antivirus software generally leaves out extra protection features such as dedicated defenses against ransomware or spam blockers.

Best Free Windows Antivirus

Reasons to Buy

Kaspersky Lab largely keeps quiet about its free antivirus product, but it's a winner, with a user-friendly interface, a fairly light system-performance impact and Kaspersky's nearly flawless malware protection. Just don't expect anything from it but the bare necessities.

Mac Antivirus

Despite what Apple's marketing has implied, Macs do get infected, and the amount of Mac malware keeps rising, with more seen in the first half of 2017 than in any previous year. But there's less money to be made in the Mac antivirus market than in the Windows one, and the products are less standardized. Some Mac antivirus products are free, and some are paid. Of the products we recently evaluated, one of our No. 2 choices, Avast Free Mac Security, doesn't cost a dime.

Best Mac Antivirus

Reasons to Buy

Best Virus Cleaner For Mac

Kaspersky Internet Security offers both the lowest system impact and some of the best malware-detection rates recorded. It even provides extra security features, including parental controls and options to lock down your webcam and stop websites from tracking your browsing activity. If you're willing to pay to protect your Mac from malware, Kaspersky Internet Security is the best option available.

Android Antivirus Apps

Every Android device, whether it's a smartphone, tablet or TV stick, should have antivirus software. Usually, that software comes with an all-encompassing security app that also includes anti-theft and remote-locating features, and many apps have both a basic free version and a premium version with more features.

Antivirus For Mac

The free versions of the Android security apps we reviewed are pretty solid. The paid versions, which cost between $15 and $30 per year, range from being just a bit better than the free ones to becoming practically separate products, with a wide range of capabilities. You'll have to decide what you need and select accordingly.

Best Android Antivirus

Reasons to Buy

Reasons to Avoid

The Bitdefender Android security app has flawless malware protection, a small performance hit, privacy-protection tools and Android Wear integration. Yet there are no scheduled malware scans, and no freemium option. (The separate Bitdefender Antivirus Free for Android only scans for malware.) Still, at $15 per year per device, Bitdefender Mobile Security is worth the expense.

iOS Antivirus Apps

A lot of people want iOS antivirus software for their iPhones and iPads. The truth is that such software doesn't exist. Apple won't let third-party apps examine other iOS apps, or even inspect new apps as they're installed. Anything that claims to be antivirus software swiftly gets kicked out of the iTunes App Store.

Many major antivirus vendors, including F-Secure, McAfee, Norton and Trend Micro, do have 'security' apps in the App Store. But these check web links for known malicious sites, locate lost devices or pretend to protect your privacy. None scans an iPhone for malware.

There has been real iOS malware that affects non-jailbroken devices, but it's very rarely cropped up. In each instance, Apple has pushed out a new version of iOS to stop the malware in a matter of days or weeks. Generally, if you keep your Apple mobile device updated to the latest version of iOS, you should be safe.

[Editor's Note: Best Buy has removed Kaspersky Lab products from its shelves, citing concerns regarding Kaspersky's alleged (but as yet undocumented) ties to the Russian government. Top U.S. newspapers have run stories in which anonymous sources say Kaspersky software helps Russia spy on American spy agencies. However, until we see real evidence that Kaspersky software is a threat to consumers, we will continue to recommend it. Here is further clarification of our position.]