5 best open source antivirus software [Windows 10 & Mac]

Radu Tyrsina
by Radu Tyrsina
CEO & Founder
Radu Tyrsina has been a Windows fan ever since he got his first PC, a Pentium III (a monster at that time). For most of the kids of his age, the Internet was an amazing...
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  • The open-source antivirus is for removing malware, and its source code is available for free.
  • BullGuard competes with the best free open source antivirus, and it neutralizes advanced threats.
  • A popular open-source virus protection for Windows 10 is also Armadito, popular among users.
  • The Open Antivirus Project is widely used too as a reliable open source antivirus software for Windows 10.
The best antivirus with an open-source
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  • Low system requirements
  • Advanced anti-malware protection

An antivirus program needs to be fast, efficient, and cost-effective, and this one has them all.

Open source antivirus software can detect lots of types of malicious software.

Experienced developers and research experts in the antivirus, network security, and computer security fields will know best the meaning of open-source software.

An open-source antivirus denotes a program for which the original source code is made available for free, and it may be modified and redistributed.

We gathered five of the best programs to make your choice more comfortable.

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The best open source antivirus software for Windows PCs



When it comes to trustworthy solutions to quickly detect and neutralize advanced threats, Bullguard is unmatched.

This antivirus may not be the exponential open-source tool since it’s already a well-established, feature-rich security solution.

Nevertheless, BullGuard embodies the scalability and efficiency you could ask from an open-source project.

Plus, it offers a 30-day free trial period to allow you plenty of time to test its features and convince yourself before closing the deal.

Let’s quickly look at its key features:

  • Open-source antivirus with real-time protection through a quick online scanner
  • Resilient and advanced security
  • Extensive Parental Control options to monitor online activity and block inappropriate content and apps
  • Behavioral Engine and advanced machine learning
  • Integrated Vulnerability scanner and firewall
  • Cloud integrated backup


BullGuard uses the new cloud protection technology so it will identify any emerging threats in real-time.
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Armadito Antivirus

This is an open-source antivirus for servers and PCs that protects systems from any viruses and malware.

The solution is, of course, available for Windows machines and it is created with a web-based central administration console.

The software can be used remotely from any location via an intuitive interface, and it will provide access to lots of features.

Let’s quickly look at its key features:

  • Traditional signature-based malware detection (ClamAV signatures and YARA rules support)
  • Innovative heuristic detection modules for binaries and PDF documents
  • Real-time protection (quarantine specific zones, provides alerts transmission and events journal)
  • Modular architecture (to easily integrate the newest detection algorithms)
  • Open-source solution (allows third-parties to review the codes and eliminate development flaws)
  • User-friendly interface (secure setup and functions that will allow you to check your machine’s and server’s status instantly)
  • Comprehensive dashboard (on-demand scanning, real-time protection, threat detection journal, technical support and more)

Get Armadito Antivirus

OpenAntiVirus Project

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This is another open-source antivirus software that includes more projects available for developers who wish to add their contributions and improve it.

OpenAntiVirus Project is based on the fact that successful open-source software provides enhanced portability, scalability, reliability, and effectiveness.

This is a platform for people who are really interested and enthusiastic about antivirus research, computer, and network security.

You will be able to use an integrative platform for various developing projects that are related to virus protection and computer security.

Let’s quickly look at its key features:

  • Includes VirusHammer (standalone virus scanner that is supposed to be run by end-users).
  • ScannerDaemon, and PatternFinder, and more tools that provide antivirus protection.
  • Squid-v scan (to scan all traffic that is going through the famous Squid HTTP-Proxy for known malware and viruses)

Get OpenAntiVirus


ClamAV is another open-source antivirus engine targeted at detecting viruses, Trojans, malware and other kinds of malicious threats.

Let’s quickly look at its key features:

  • The open-source standard for mail gateway scanning programs
  • Includes a multi-threaded scanner daemon and command-line utilities for on-demand file scanning and also for automatic signature updates
  • Supports various file formats, file and archive unpacking, and various signature languages
  • Suitable for web scanning, email scanning, and endpoint security as well
  • The virus database is updated multiple times a day.

Get ClamAV


ClamWin is a free antirust software for Windows, and the program is being used by more than 600,000 users worldwide on a daily basis. It includes an easy installer and open source code.

Let’s quickly look at its key features:

  • High detection rates for viruses and spyware
  • Includes a scanning scheduler, standalone virus scanner, and right-click menu integration to Microsoft File Explorer
  • Automatic downloads of regularly updated Virus Database
  • Add-on is available for Microsoft Outlook (removes virus-infected attachments instantly and automatically)

Note: ClamWin Free Antivirus doesn’t come with an on-access real-time scanner. This means that you will need to manually scan a file in order to find a virus or potential spyware.

Get ClamWin

These are some of the best open-source antivirus programs that you can currently find out there.

All of them are great, offering robust sets of useful features and you can go for each one.

If you have any other suggestions for this list, don’t hesitate to leave them in the comments section below.

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You lose credibility when number 1 on the list is a paid software. If I wanted to pay for a software, I wouldn’t look up open source options.