MultiAntivirus

Free plan Windows

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What MultiAntivirus is

MultiAntivirus is a free, open-source antivirus and internet security suite for Microsoft Windows. It combines an improved ClamAV engine with a separate scanning engine, while its maker says more engines may be added later. A precognitive engine uses application behavior and feedback to identify threats that may not yet appear in classic antivirus databases. Ransomware protection is included, and an affiliated NAS solution can handle backups automatically at no additional cost. Optional zero-trust mode sanitizes HTML and JavaScript on websites and can work with email programs through supported extensions. Extensions for Office Outlook 2019 and Thunderbird scan incoming and previously received messages. Business, gamer, and ordinary-user profiles adjust usage. An enterprise offering covers unattended servers, virtual-machine hosting, remote desktops, and complete virtual-machine backups. The downloadable preview is reduced and intended for scanning and forensics, not the full product.

Who it suits

It suits Windows users seeking an open-source antivirus with multiple scanning engines, ransomware protection, and optional email or web sanitization. Enterprise administrators may consider its described unattended-server setup.

What it does well

Open-source Windows antivirus suite
Combines ClamAV with another scanning engine
Includes ransomware protection
Optional website and email sanitization
Free preview for PC scanning

What to know first

Preview is not the full version
Full version contents are not yet revealed
Testing is unpaid and carries no damage guarantee
Windows platform only

Plans

Plan	Billed and limits	Price
Preview of MultiAntivirus	Reduced version for PC scanning; 64-bit downloads with ClamAV LTS or fresh	Free
Community version	Full version download page says its contents are not yet revealed; tester access by contacting maker	On request

As multiantivirus.com lists them, read 12 Oct 2026. The maker's own page has the final word.

Verdict

MultiAntivirus offers layered scanning and several specialized protections, with profiles for different usage patterns. The available download is only a reduced preview, and access to the fuller community version depends on maker-provided availability.

Facts from MultiAntivirus's own pages

Behavior-based detection: Its precognitive engine is described as using application behavior and feedback to identify threats not yet in classic antivirus databases. · multiantivirus.com, 12 Oct 2026
Company and site date: The site footer credits Giesa Labs and displays copyright years 2011–2021. · multiantivirus.com, 12 Oct 2026
Email scanning: The product can scan incoming email and previously received messages on the PC using extensions for Office Outlook 2019 and Thunderbird. · multiantivirus.com, 12 Oct 2026
Enterprise offering: The enterprise page describes an automated security suite for unattended servers and discusses virtual-machine hosting, remote desktops, and backups of complete virtual machines. · multiantivirus.com, 12 Oct 2026
Enterprise security: The enterprise page describes an automated security suite for servers intended to run unattended. · multiantivirus.com, 12 Oct 2026
Enterprise setup: The maker describes an office setup with a virtual-machine host, remote desktop access, and backups of entire virtual machines. · multiantivirus.com, 12 Oct 2026
Founded: 2007 · multiantivirus.com, 28 Sept 2026
Free plan: Yes · multiantivirus.com, 23 Sept 2026
Full version availability: The download page says the full version contains secret material that will not be revealed soon. · multiantivirus.com, 12 Oct 2026
Honeypot: The enterprise page describes a honeypot as a false target that triggers an alarm when it is penetrated. · multiantivirus.com, 12 Oct 2026
Maker attribution: The site footer attributes the site to Giesa Labs and shows copyright years 2011–2021. · multiantivirus.com, 12 Oct 2026
Multi-engine scanning: It combines an improved version of ClamAV with a maker-developed scanning engine, and says additional engines may be added in the future. · multiantivirus.com, 12 Oct 2026
Multiple scanning engines: It says it combines an improved version of ClamAV with a separate scanning engine, and that more engines may be added in the future. · multiantivirus.com, 12 Oct 2026
Open-source components: The maker lists ClamAV, Titanium proxy, AdBlock Plus, AngleSharp, EasyHook, and other open-source projects as components used in MultiAntivirus. · multiantivirus.com, 12 Oct 2026
Preview limit: The downloadable preview is a reduced scanning-only version and is described as a forensic tool or preview, not the full product. · multiantivirus.com, 12 Oct 2026
Preview limitation: The downloadable preview is a reduced version useful for scanning a PC and forensics; the page says it is not the full version. · multiantivirus.com, 12 Oct 2026
Product: MultiAntivirus describes itself as an open-source antivirus and internet security suite for Microsoft Windows. · multiantivirus.com, 12 Oct 2026
Protection scope: internet security · multiantivirus.com, 23 Sept 2026
Ransomware backups: The maker says an affiliated NAS backup solution can be handled automatically by MultiAntivirus and that the NAS software is available at no additional cost. · multiantivirus.com, 12 Oct 2026
Ransomware protection: Yes · multiantivirus.com, 23 Sept 2026
Security notice: The site advises visitors never to provide banking or other personal information anywhere on the site. · multiantivirus.com, 12 Oct 2026
Supported platforms: Microsoft Windows · multiantivirus.com, 23 Sept 2026
Tester status: The changelog says version 1 is ready to be used and tested, and directs interested testers to contact the maker for an installation link. · multiantivirus.com, 12 Oct 2026
Testing caveat: The maker says testing is unpaid and provides no guarantee the software will work or avoid damage to PC data. · multiantivirus.com, 12 Oct 2026

Where MultiAntivirus stands on Freedom251

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