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Immunet Antivirus Review 2021 - Something You Need To Know!

Ranked 39th from 58 antivirus companies
Ranked 39th from 58 antivirus companies
Eric C.
Eric C.
Published on: May 5, 2021

Immunet Detailed Expert Review

Immunet is a free cloud-based antivirus and malware removal tool that is powered by the open source ClamAV scanner. The program’s unique feature is its crowd-sourced virus detection model, which allows users to encourage friends and family members to sign up for the service. How good a job does it do at thwarting viruses, though? Here’s what I found out after testing.

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Immunet relies on ClamAV for its antivirus protection. While this isn’t the most comprehensive or powerful scanner on the market (like Immunet, it is also free), Immunet does provide a user-friendly front-end for this tool which is otherwise only available as a definitions database. ClamAV’s detection scores in independent reviews, however, have varied from as low as 60% (ShadowServer) to as high as 90%. In other words, its effectiveness is debatable and the engine doesn’t have a strong track record. The tool did pick up on a test virus that I downloaded, but those in need of top-level virus detection should probably look elsewhere.

Expert on Cyber Security, Fintech, and Cryptocurrency

On the malware side, Immunet uses the next-generation ETHOS and SPERO cloud detection engines. These more advanced programs use machine learning and heuristic behavior detection to sift through user-submitted code samples to find both known and emerging pieces of malware.


Despite its so-so virus scanning credentials, Immunet has some nice additions that make it worth considering if you want a free solution.

These include the following:

  • A CPU/Memory display: Yes, this information can easily be obtained from Task Manager, but I appreciated the fact that Immunet gave it space on the product dashboard. One of the key concerns about running an antivirus is how much processing power and memory it is going to take up. This isn’t a problem with Immunet—the installer is lightweight and even during full scan mode I barely saw my CPU activity figure go past 20%.
  • Immunet Community: One of the truly unique facets of Immunet is its social network—the Immunet Community. It doesn’t exactly give Facebook a run for its money, but it does provide a global network of users who help one another by providing virus data. It ties into the cloud-based malware detection engines and helps other users have the best chance of running effective protection against malware.
  • Notification options: Immunet includes a gamer mode (to run silently when users are gaming) as well as the option to display verbose tray notifications. Verbose notifications are useful for users who want to gain richer, more in-depth information about the notifications being displayed and can be an invaluable resource when the system needs a troubleshoot.
  • Automatic updates: Definition updates are by default configured to update automatically. I always recommend that users select this option (and dislike antivirus programs that don’t provide this choice) to avoid falling behind on important security updates and risking the health of your system.
  • Compatibility: If you don’t feel confident enough to run Immunet as your sole antivirus, the company has also conducted extensive testing to ensure its compatibility to run alongside other tools. The list of compatible programs is published on Immunet’s website and includes many familiar names, including Norton, McAfee, Kaspersky, and Comodo.

Ease of use

At just over a megabyte, Immunet is one of the lightest antivirus installers that I’ve found. Likewise, ClamAV’s entire definition database generally amounts to less than 20MB. The result is a system that is incredibly quick to set up and keep updated.

Expert on Cyber Security, Fintech, and Cryptocurrency

Immunet is also an exceptionally easy program to navigate. In addition to the dashboard, there’s an “update now” button to enable manually polling for updates, a history log, and a basic settings menu.

Expert on Cyber Security, Fintech, and Cryptocurrency

Immunet certainly isn’t feature-packed but does a good job at keeping its system exceptionally lightweight, fast, and easy to use. The program runs best on Windows 10 but there’s backward compatibility as far as Windows 7 (in addition to support for the two latest versions of Windows Server).


Immunet is a free platform, so there isn’t much support. Nevertheless, it provides some basic FAQs and documentation that should be sufficient to resolve most user difficulties. Topics range from resolving installation problems to setting up gamer mode and configuring different scan types, including custom scans, full scans, and rootkit checks.

There’s also a user support forum where users help each other out with usage issues—although the level of activity is quite low so it can’t be relied upon for a quick response. Missing, of course, are phone, ticket, and live chat support.


Immunet is a completely free tool—all users need to get running is to download the installer from the company’s website (to avoid confusion: the company formerly produced a paid tool, Immunet Plus, that is no longer available or supported). The company used to include a browser toolbar with the installation to keep the service running, but I did not encounter that during my test.

Immunet Products & Pricing

Bottom Line

Immunet’s virus detecting abilities are modest but may be sufficient in some cases. It’s exceptionally lightweight and completely free.

About the Author

Eric C.
Eric C.
Expert on Cyber Security, Fintech, and Cryptocurrency

About the Author

Eric is a professional cyber tech expert with almost a decade of experience writing about security and tech. In recent years, he has been focused heavily on the rapidly developing fintech and cryptocurrency industries and how they relate to online security.

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Immunet User Reviews

7 3
Based on 10 reviews in 3 languages 6.7
You can trust the Community! Companies can't ask us to delete or change user reviews.
United Kingdom
the cpu usage isnt accurate
Windows User
Ran full scan and had performance tab opened in task manager. CPU is running at 100% while immunet is showing 24%.
United States
Underrated Ugly Shield
Windows User
I liked the idea of community based and open source protection, so Immunet was an interesting find for me. On my first install and use, I noticed a few things that I wish were done better. For one, the Flash Scan used 100% of my CPU (Ryzen 5 4500U) and 1.5GB of RAM, even though it finished quickly under 2 minutes scanning 10,000 files. What I noticed most is that the UI is extremely small and out-dated looking as if it were from a Windows Vista era. I understand ClamAV was developed for Linux, (and I am also an avid Linux user) however these eye-squinting visuals can be off-putting. The GUI of the application looks very suspect to a new user who is used to more modern simplistic designs for apps in Windows 10, Mac, and even new versions of ...Show More
South Africa
Immunet is efficient and finds in a flash what even paid Anti-Virus systems miss.
Linux User
I've been trying out Immunet on a number of systems across a variety of PCs and I find it's unique efficiency finds what many paid anti-virus systems miss and even without a full scan. Immunet achieves this feat while maintaining high performance. I highly recommend Immunet based on what I've observed so far.
user avatar
cuvtixo Raymond
another great thing is we can be confident of your honesty! Because it's a free product, and the engine at least, is Open Source. I'm never 100% certain about reviews of Norton or McAfee, or any of the paid proprietary anti-malwar...Show More
user avatar
Unsure cuvtixo
Feb. 13, 2021
There is the free version and a paid Plus version so be careful.
user avatar
Raymond Koekemoer cuvtixo
All true. I believe open source software is underrated for the same reason: no paid reviewers and no marketing.
user avatar
BettyKunene Raymond
Works well on my laptop at school.

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