Avast One is a free, all-in-one service that provides users with antivirus, privacy, security, and performance tools to ensure their safety and privacy online. With a VPN, users can make their connection to any network secure and private, while the advanced antivirus protects against viruses and malware. The app also offers data breach monitoring to quickly re-secure online accounts and boost device performance by cleaning junk and stopping apps running in the background.

The device protection features of Avast One include an advanced antivirus that automatically scans for viruses and malware, a virus cleaner that safely removes viruses and malware from phones, and a web shield that scans and blocks malware-infected links. The app also includes a Wi-Fi scanner to check a network's encryption and password strength to avoid joining a network where safety or privacy would be at risk.

Avast One also offers online privacy features such as military-grade security with a VPN, true online privacy to hide online activities, and access to streaming subscriptions while traveling by changing the device's location to any of 35 countries. The app also includes data breach monitoring to scan for leaked passwords linked with the email address used to sign in to online accounts and quickly re-secure compromised accounts.

Finally, Avast One provides smooth performance with a junk cleaner to make more space for photos, videos, and music by cleaning out junk files, and a task killer to boost performance by killing apps not in use and stopping apps running in the background. The app uses the Accessibility permission to protect visually impaired and other users against phishing attacks and malicious websites.