MultiAntivirus review
A Windows-only open-source suite for multi-engine and behavioral threat scanning.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
MultiAntivirus is an open-source antivirus and internet security suite for Microsoft Windows, aimed at technical users who want multiple scanning engines in one product. It combines an improved ClamAV engine with a proprietary behavioral engine intended to identify previously unknown threats. Profiles for business, gamer, and ordinary-user scenarios provide configurable approaches, while a reduced preview version is available for PC scanning. The project is distributed under the GNU GPL version 3 license.
Its protection scope extends beyond standard file scanning. MultiAntivirus describes ransomware protection through automated NAS backups, along with optional web and email sanitization. It can scan current and previously received emails, and provides extensions for Microsoft Outlook and Mozilla Thunderbird. Those capabilities make it a relevant choice for Windows users who want email-focused scanning and backup-based ransomware protection alongside multiple engines. Nextcloud and ClamAV integrations also broaden its fit for users already working with those products.
The main consideration is product availability and platform scope. Windows is the only supported platform, so it is not suited to households or teams that need coverage across multiple operating systems. The official site states that development for the Windows antivirus was previously suspended, and the download page explicitly provides only a reduced preview version rather than revealing the full version. Choose MultiAntivirus if open-source licensing, multi-engine scanning, behavioral detection, email extensions, and NAS backup protection match your requirements. Choose an alternative if you need a currently established release offering or protection beyond Windows.
MultiAntivirus pros and cons
- Where it wins
- Combines multiple antivirus engines with behavioral threat detection
- Offers ransomware protection with automated NAS backups
- Supports Outlook, Thunderbird, Nextcloud, and ClamAV integrations
- Where it doesn't
- Windows is the only supported platform
- The full version is not currently revealed on the download page
- Development was previously suspended according to the official site
MultiAntivirus fact sheet, pricing and score →
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