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Microsoft Defender vs ClamAV: catalog facts
Microsoft Defender	ClamAV
Paid Included with a paid Microsoft 365 subscription, with a free trial available.	Free Free and open source under the GPL 2.0, maintained by Cisco Talos.
Windows, macOS, Android, iOS	Windows, macOS, Linux, Command line
Manages security for several family members and devices from one dashboard Dark web monitoring for more than 60 types of personal information	Signature format is open, so anyone can write detections Designed to be embedded in mail servers, file shares and upload pipelines
Requires a Microsoft account and a Microsoft 365 subscription Closed source, with protection tied to Microsoft's cloud services	Detection rates trail the commercial engines in independent testing Not a real-time desktop protection suite on its own
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
Account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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