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ClamAV vs Acronis True Image: catalog facts
ClamAV	Acronis True Image
Free Free and open source under the GPL 2.0, maintained by Cisco Talos.	Paid Paid software sold by Acronis; cloud storage is an optional part of the offer.
Windows, macOS, Linux, Command line	Windows, macOS
Signature format is open, so anyone can write detections Designed to be embedded in mail servers, file shares and upload pipelines	Image-based backup of a whole system Backup and anti-malware in one product
Detection rates trail the commercial engines in independent testing Not a real-time desktop protection suite on its own	Paid, closed-source software Renamed several times, which can make older guides confusing
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.