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Bitdefender Antivirus Free vs Avast Free Antivirus: catalog facts
Bitdefender Antivirus Free	Avast Free Antivirus
Free Free with no time limit; paid Bitdefender products add more protection.	Freemium The antivirus is free; Avast sells a VPN and other paid products.
Windows	Windows, macOS, Android
Free with no time limit or credit card Simple installation in a few steps	Free antivirus from a large vendor Available for Windows, macOS and Android
Windows only Basic protection; extra features require a paid upgrade	Closed source Promotes paid products from within the free offer
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 October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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