Uses a six-layer defense—including Web Shield, Behavior Shield, and CyberCapture—to block unknown files before they can reach your system.

Avast Free remains one of the most powerful free antivirus engines on the market. It offers protection that is arguably better than the built-in Windows Defender in some specific tests. However, the "cost" of using it is no longer just zero dollars—you pay with your attention (dealing with ads) and your data trust.

The biggest downside to Avast Free is the aggressive upselling. Because it is a free product, the company relies heavily on converting users to the paid "Premium" version.

: Avast has faced privacy criticism in the past (e.g., selling user data via Jumpshot, discontinued in 2020). Current privacy policy is stricter, but users concerned about telemetry may consider alternatives.