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Avast Free Antivirus vs Bitdefender Antivirus Free: catalog facts
Avast Free Antivirus	Bitdefender Antivirus Free
Freemium The antivirus is free; Avast sells a VPN and other paid products.	Free Free with no time limit; paid Bitdefender products add more protection.
Windows, macOS, Android	Windows
Free antivirus from a large vendor Available for Windows, macOS and Android	Free with no time limit or credit card Simple installation in a few steps
Closed source Promotes paid products from within the free offer	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
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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