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Avira Free Security vs Bitdefender Antivirus Free: catalog facts
Avira Free Security	Bitdefender Antivirus Free
Freemium Free tier with paid Internet Security and Prime plans.	Free Free with no time limit; paid Bitdefender products add more protection.
Windows, macOS, Android, iOS	Windows
Real-time antivirus at no cost Extra tools like software updater and browser safety	Free with no time limit or credit card Simple installation in a few steps
Closed source Upsells paid plans and premium tools	Windows only Basic protection; extra features require a paid upgrade
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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