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Free Windows Security Alternatives

The best free alternative to Windows Security is Malwarebytes Anti-Malware. If that doesn't suit you, our users have ranked more than 100 alternatives to Windows Security and loads of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Windows Security are Avast Free Antivirus, Clam AntiVirus, Spybot - Search & Destroy and AdwCleaner.

Windows Security alternatives are mainly Anti-Virus Apps but may also be Anti-Malware Apps or Firewalls. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Windows Security.
This page was last updated May 19, 2022
  • Free PersonalProprietary
  • Windows

Windows Security (known as Windows Defender Antivirus before Windows 10 May 2020 Update, Windows Defender before Windows 10...

Learn more about Windows Security

  1. Malwarebytes Anti-Malware

    • FreemiumProprietary
    • Mac
    • Windows
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Kindle Fire

    Malwarebytes Premium is smarter, faster, and lighter than ever before. Go beyond antivirus and stop worrying about online threats.

    Malwarebytes Anti-Malware vs Windows Security opinions
    Most users think Malwarebytes Anti-Malware is a great alternative to Windows Security.
    brta2818

    Its real-time scanner (if you've shelled out for the premium version) uses less system resources than that of Microsoft Defender.

    Positive comment 7 months ago
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    Malwarebytes is very popular and works well.

    Positive comment almost 3 years ago
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    -4
  2. Avast Free Antivirus a the free for non-commercial and home usage antivirus solution from AVAST Software.

    Avast Free Antivirus vs Windows Security opinions
    This alternative is disputed. Avast Free Antivirus is still a legitimate alternative to Windows Security, but it might have issues that some users think are important.

    Don't trust these big-name security suites, they're crap and full of bloatware. Same goes for AVG, Avira, Comodo. When they get on your system they just take over and nag you to buy whatever...

    Negative comment almost 3 years ago
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    20


  3. Clam AntiVirus

    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • BSD

    Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail gateways.

  4. Spybot - Search & Destroy

    • FreemiumProprietary
    • Windows
    • Windows Mobile
    • Symbian S60
    • PortableApps.com

    Spybot - Search & Destroy detects and removes spyware, a relatively new kind of threat not yet covered by common anti-virus applications.

  5. AdwCleaner

    • FreeProprietary
    • Windows

    AdwCleaner is an easy-to-use OS security utility that allows you to get rid of adware on your computer in seconds, by quickly scanning the system.

    AdwCleaner vs Windows Security opinions
    pros, cons and recent comments

    This was recommended by some geeks.

    Positive comment almost 3 years ago
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    0


  6. Avira Free Antivirus offers basic protection for your computer against dangerous viruses, worms, spy-ware, trojans and costly dialers.

  7. Kaspersky AntiVirus

    • FreemiumProprietary
    • Windows

    Kaspersky AntiVirus offers protection from a range of IT threats and provides the basic tools needed to keep your PC secure.

    Kaspersky AntiVirus vs Windows Security opinions
    pros, cons and recent comments
    Nitsu29

    Very good signature database and probably the best protection against Malware and Ransomware. Worth the money if you usually visit sites that can easily screw you over

    Positive comment 6 months ago
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    0

    Kaspersky Security Cloud Free Blocks non-dangerous Web Sites. It blocked Push Pay Web Site my church uses to make donations. It blocked my AT&T Digital Home phone site as well. Whitelisting did not help. November, 2020

    Negative comment over 1 year ago
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    0
  8. ClamTk

    • FreeOpen Source
    • Linux

    ClamTk is a graphical front-end for ClamAV, an open source antivirus engine for detecting trojans, viruses, malware & other malicious threats. It is designed to be an easy-to-use, lightweight, on-demand antivirus scanner for Linux systems.

  9. ClamWin

    • FreeOpen Source
    • Windows
    • PortableApps.com

    [Please note that ClamWin Free Antivirus does not include an on-access real-time scanner. You need to manually scan a file in order to detect a virus or spyware.]

  10. Bitdefender Antivirus

    • FreemiumProprietary
    • Mac
    • Windows
    • Android
    • Android Tablet

    Bitdefender comes with real time scanning that is called Virus Shield and an auto-scan mode that checks your system when the computer is idle. Game mode is fully automated and will be enabled when it detects a full screen application running.

    Bitdefender Antivirus vs Windows Security opinions
    pros, cons and recent comments

    Recommended by some serious geeks. Some of them use it and seem happy with it.

    Positive comment almost 3 years ago
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    -1
Showing 10 of 73 alternatives