Windows Defender vs Avast vs Bitdefender vs Norton

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What do Windows defender, Avast, Bitdefender and Norton all have in common? Yes, you’re right; they are all software created to protect your computer. Now, they all share similar features but do they perform the same functions? Which one is better and more suitable for the protection of your computer? If you want to find best antivirus for Windows 10, best antivirus for macbook or best antivirus for android – read this compare, you will find another poin of view. Join me as I compare the software, but first, let’s take a look at the software we’re talking about.

Windows defender is an anti-malware and antivirus software; it is a program designed by Microsoft that comes pre-loaded with the Windows operating system. It was first intended as an anti-spyware in earlier versions of Microsoft Windows, but it has evolved into a functional antivirus software in Windows 8 and above.

Avast antivirus needs no introduction; most of us are familiar with the unique ‘threat has been detected’ alert. Being crowned the best antivirus of 2017 and 2018 is no mean feat. Avast antivirus is a body of security applications designed to provide complete protection for your computer whether online or offline. It includes internet security; antiphishing, antispyware, anti-spam and antivirus protection for your computer.

Bitdefender is a Romanian computer protection software designed to act as an excellent anti-malware, antivirus and internet security shield for your computer. It is one of the best antivirus software available anywhere, and it also comes with a lot of useful extra features that provide balanced protection for your computer both online and offline.

Norton antivirus has been around since February 1991, and they have a track record of being one of the best and most reliable antivirus software available today. Norton antivirus is owned by American company ‘Symantec,’ a company that produces computer security software. They have numerous other software alongside Norton antivirus which can provide complete the for your computer.

Now that we are better acquainted with each one of them, we can now compare their performance and determine which one is best for your PC.


According to the AV-Test Institute; an agency that collects malware samples, in terms of anti-malware protection, Avast and Bitdefender performed higher than the other software. It was determined that Avast and Bitdefender tied in the test results. So, this round goes to Avast and Bitdefender. Norton has been known to give false alarms sometimes, but it does offer better protection that Windows Defender.


This round goes to Avast. When compared with the other software, Avast was discovered to have extra utilities and more security-related functions to ensure the complete protection of your computer. Next, in second place, we have Bitdefender, followed by Norton. Windows defender has the least other utilities and security-related features among the other software.


In terms of software’s impact on a computer system, Bitdefender was found to have the least impact on the computer system. It requires way less memory and CPU power to function. That gives it a slight edge over Norton and Avast which were also found to have minimal impact on the system’s resources. The least ranked software in this category is Windows defender as it puts a lot more strain on your computer when compared to the other software.


In this category, Avast tops the other software as its user interface is the most user-friendly on the list. Next on the list is Bitdefender and coming in third is Norton Antivirus. Windows defender has the most complicated interface when compared with the other software.


Bitdefender offers premium protection for the lowest prices when compared to Avast and Norton. Avast’s prices are the highest, but it does provide value for money and complete protection for your computer system. This category does not apply to Windows defender as it does not provide premium upgrades, it is entirely free.

VERDICT: After careful consideration and comparison of what each antivirus software offers, Avast wins as the most popular and well-rounded antivirus for your computer system as well as mobile devices.