Windows Defender vs Avast | All You Need to Know in 2018

Windows Defender or Avast? Read this ultimate guide to find out how Windows Defender and Avast stack up against each other in terms of features, protection, system performance, user interface, and more.

Note: Since Windows Defender doesn’t offer a paid upgrade, I will limit the scope of this guide to only the free versions of both products. However, you’ll get an overview of Avast’s premium suites.

In today’s world, you need to pay extra attention to the software you run on your computer, the websites you visit, and the stuff you purchase online. With so many malicious files out there (and the number keeps on increasing with every passing year), it has become imperative that you use an antivirus software – at least a free solution if not a paid one.

Once malware-infected files sneak into your computer, they can do a lot of horrible things, such as stealing your passwords/sensitive data, deleting your personal files, causing your computer to malfunction, and more.

Fortunately, there’re so many free and paid antivirus software out there that you can use to keep your computer safe and secure.

In this guide, I will do an in-depth comparison between Windows Defender — the default antivirus that comes with Windows operating system — and Avast.

Both antivirus solutions will be judged on four categories: features, protection, system impact, user interface, and cost.

If you’re in a rush and only want to see the summary of this comprehensive Windows Defender vs Avast comparison, see this infographic:

Windows Defender vs Avast Comparison [Infographic]

Windows Defender vs Avast Comparison [Infographic]

Windows Defender vs Avast: Which Offers More Features?

While it is true that Windows Defender Antivirus (formerly called Windows Defender) is not the most feature-rich computer security solution you’ll ever come across, it does have all the essential features an antivirus product is supposed to provide.

Built into Windows 8/8.1/10 and available in Windows Vista/7 as Microsoft Security Essentials, Windows Defender can run different types of scans, such as a quick scan, a full scan, a custom scan (for checking specific files and folders), and an offline scan (deep malware scan that runs before the Windows can fully load up).

Windows Defender’s best feature by far is its built-in firewall; it monitors your network traffic and prevents hackers from gaining access to your computer. A Fresh Start feature (cleanly reinstalls the latest version of Windows while keeping most of the settings and personal files intact) is also part of the Windows Defender Antivirus.

Another handy utility that is included in the software is a SmartScreen utility. It blocks potentially dangerous websites and unsafe downloads and also checks for unrecognized apps on the web. But the downside of this feature is that it only works with the Microsoft Edge browser — making it of little use in the modern multi-platform world.

Windows Defender also has built-in parental control features which you can use to control the websites your children can visit and limit the number of hours they can spend online. You can also limit their access to only the apps suitable to their age group. Again, parental control features are only available to you if you use the Microsoft’s own browser.

On the other hand, Avast Free Antivirus not only boasts a variety of security-related features but also packs several useful utilities that other antivirus companies usually include in their premium suites.

You can run different types of scans with Avast, such as a smart scan, a full scan, a boot-time scan (scans for malware before the Windows loads up).

The freeware includes a Wi-Fi Inspector tool (helps you find vulnerable networks and settings in your home network) and a limited Software Updater (tells you about other outdated applications).

If you’re using any other antivirus solution alongside Avast, you can set it to run in the passive mode.

A silent/gaming mode feature (provides interruption-free experience), a rescue disk option (removes deeply rooted malware infections), and an unlimited password vault are also available in the free offering. And yes, email client protection is also part of the software.

Avast’s offers two browser extensions: Avast Online Security and Avast SafePrice. The former warns you if you’re on a dangerous website and blocks those known to be involved in phishing practices, while the latter compares prices of products from around the web to help you find the best deal.

To enjoy premium features and top-level protection, you must upgrade to any of the Avast’s premium plans listed below. (We recommend Avast Internet Security).

With Avast Pro Antivirus, you get everything that comes as part of the freeware, along with a Sandbox option (lets you test suspicious files in a virtual environment so they don’t wreak havoc on your PC), a Real Site feature (prevents hackers from hijacking your DNS settings and stealing your sensitive data), and premium in-product support.

The company’s most popular suite, Avast Internet Security, adds an advanced firewall and an extra layer of protection against ransomware attacks.

Avast Premier includes everything that comes with the “internet security” plan plus a data shredder (deletes your sensitive files permanently so no one can recover them), an automatic software updater, and protection against webcam spying.

Features included in Avast Security Suites

Windows Defender vs Avast: Which Provides Better Malware Protection?

Both Windows Defender and Avast use signature-matching detection to compare a suspected file against a huge database of known malware threats, as well as heuristic monitoring (which monitors behavior and other attributes of files) to detect previously unseen malware (also called zero-day malware).

To find out which product offers better protection, I’ll look at how both software performed in the most recent tests conducted by AV-Test and AV-Comparatives — two well-known and trusted independent security institutes.

According to AV-Test’s most recent tests, which were conducted on Windows 10 platform, Windows Defender protected against 100% of the zero-day (unseen) malware when tested against 202 samples in September last year, but its effectiveness dropped to 96.3% in the next month.When tested against 9,797 samples of widespread and prevalent malware, Windows Defender detected 99.5% of it in September and 99.9% in the following month

It received 5/6 rating in the “protection” category from the security experts at AV-Test.

Windows Defender Protection test report on Windows 10 by AV-Test

Avast, on the other hand, came up with perfect results; it detected 100% of the zero-day and widespread malware in both months – earning an excellent 6/6 star rating from the security experts.

Avast and AVG's protection test report on Windows 10

In similar tests conducted on Windows 7 platform in July and August 2017, both software were tested against 198 zero-day and 10,973 widespread malware samples.

Avast once again showed its dominance; its detection rates were 99.9% and 100% in both months for both types of malware samples, securing a perfect 6/6 star rating from the security professionals.

Avast and AVG's protection test report on Windows 7

Windows Defender received 5/6 star rating courtesy their 99.0% and 97.0% detection rates against zero-day malware in July and August respectively and also blocked 99.8% of widespread malware in both months.

Windows Defender Protection test report on Windows 7 by AV-Test

Austrian lab AV-Comparatives is another trusted security institute that publishes reports on various aspects of antivirus solutions.

In their malware protection test, which was held in September 2017, they tested the antivirus software’s ability to protect the system againstAV-Comparitives malware protection test awards malware (before, during, or after execution), Avast received an excellent “ADVANCED +” award with 99.99% protection rate and only returned 9 false positives (i.e. misidentifying harmless file as malware).

Windows Defender received the “TESTED” award, which was the lowest status. Its AV-Comparatives Malware Protection Test TESTED awardprotection rate was 98.84% and returned 6 false positives.

In AV-Comparatives’ real-world protection test, which aims to gauge the protection level of antivirus products against real-world conditions, Avast once again earned a perfect “ADVANCED +” status, while Microsoft’s product only managed “ADVANCED” award.

AV-Comparitives real-world protection test awardsAV-Comparatives Real-World Protection ADVANCED award

So, it’s clear that Avast’s solution provides a lot better overall protection than Windows Defender Antivirus. Also, it’s worth mentioning that only Avast provides protection against less risky items, such as adware, Potentially Unwanted Programs (PUPs).

Windows Defender vs Avast: Which is Lighter On System Resources?

It is the part of antivirus software’s job to provide real-time protection and to do that, they continuously run in the background just like any other application, consuming some percentage of system resources all the time.

It is imperative that antivirus software not only provide an excellent level of protection but also doesn’t consume too much of system resources.

Again, I’ll look at AV-Test and AV-Comparatives’ reports to see which software puts lesser strain on system performance.

In AV-Test’s “performance test,” they look at how different antivirus products slowed down the system on while performing typical tasks, such as launching popular websites, downloading and installing widely-used applications, and copying of files.

Here’s how Windows Defender Antivirus performed in tests conducted in September and October 2017. (The results are expressed in terms of percentage slowdown on a standard and high-end PCs.)

Windows Defender Performance Report by AV-Test

And here’re the results of the same tests when done with Avast installed.

Avast Performance Test Results by AV-Test

Both software received 5/6 star rating in “protection” category from AV-Test’s experts.

Note that these tests were conducted on Windows 10 platform in Sep-Oct 2017.

Similar tests were conducted on Windows 7 platform in July and August 2017. Avast received 5/6 star in those tests while Windows Defender only managed 4.5/5 stars. (See this and this if interested in detailed reports.)

AV-Comparatives’ performance test, which took place in September last year, examined the impact of different antivirus products on system performance by carrying out typical tasks, such as copying files, archiving/archiving, installing/uninstalling applications, downloading files, and browsing websites.

Avast earned “ADVANCED +” award from AV-Comparatives with an impact score of 8.9, while Microsoft’s security suite was AV-Comparitives performance test awardsAV-Comparatives Performance Test STANDARD awardawarded “STANDARD” rating because of its higher impact score of 30.4.

In short, it is evident that Avast puts less impact on system performance than Windows Defender, but you can rest assured that neither of them will cause significantly slowdown your computer.

Windows Defender vs Avast: Which Offers Better User Interface?

Everybody prefers using a software that provides a clean user interface and easy-to-use navigation.

Windows Defender’s interface used to be slightly in the past but that’s no longer case after the recent update, which not only modernized the interface but also turned it into a fully-fledged security center from where you access all the security features and settings.

The home window, apart from showing protection status and last health scan date, provides a way access different modules.

Windows Defender Interface on Windows 10

The green check mark represents that everything is fine while the red one indicates a problem.

At the bottom left, there’s a button which takes you to the settings page. Windows Defender’s interface is also resizable, which is a bonus.

Avast’s interface is elegant too, but it may seem a little more complicated and overwhelming to use when you compare it with Microsoft’s security center. There’s a vertical menu on the left that has four tabs: status, privacy, protection, and performance. Each tab contains submenu items (features) associated with it.

The red color signals a problem while the green indicates that everything is okay. You can access settings page via a button located at the bottom-left corner.

It must be mentioned that Avast’s freeware shows unobtrusive ads and also contain premium features that are not included in the free version.

So, it’s evident that Windows Defender not only provides a minimalistic user interface but also doesn’t show ads to get you to upgrade.

Windows Defender vs Avast: Which is Less Expensive?

Microsoft doesn’t offer a lineup of security products like Avast, so it’s not possible to draw a comparison in this category.

Here’re are the prices of different Avast’s plans:

Avast Security Suite Price
Avast Free Antivirus Free
Avast Pro Antivirus $49.99/year (1 Device)
Avast Internet Security $59.99/year (1 Device)
Avast Premier $79.99/year (1 Device)


Final Thoughts

If you’re just looking for a free antivirus solution, go with Avast. It includes several handy utility tools along with great malware protection and low system impact. However, you should consider a purchasing a premium suite if you want complete protection and a peace of mind.

Additional Notes

If you think I’ve stated something wrong or missed something in this Windows Defender vs. Avast guide, feel free to let me know in the comments.

Related: Avast vs AVG | The Ultimate Comparison
 Malwarebytes vs Avast | The Definitive Guide (2018)
Related: Avira vs Avast — Everything You Need to Know
Related: Bitdefender vs Avast | The Ultimate Comparison
Related: McAfee vs Avast | The BEST Comparison On the Internet (2018)
Related: Norton vs Avast | The Only Comparison You Should Read Protection Status

Umair Anwar

Umair Anwar has helped several online companies grow their influence and revenue by implementing strategies and tactics that actually work. He is an internet marketer and a technology buff.

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2 Responses

  1. andrey says:


  2. Andrius says:

    I am an Avast user for the last 4 to 5 years. Avast was good back then but something has happened to it and I have stopped using it.

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