Compare software

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

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