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Microsoft Defender vs Avira Free Security: catalog facts
Microsoft Defender	Avira Free Security
Paid Included with a paid Microsoft 365 subscription, with a free trial available.	Freemium Free tier with paid Internet Security and Prime plans.
Windows, macOS, Android, iOS	Windows, macOS, Android, iOS
Manages security for several family members and devices from one dashboard Dark web monitoring for more than 60 types of personal information	Real-time antivirus at no cost Extra tools like software updater and browser safety
Requires a Microsoft account and a Microsoft 365 subscription Closed source, with protection tied to Microsoft's cloud services	Closed source Upsells paid plans and premium tools
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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