Avast SecureLine VPN for Windows and Android is safe because it's built by the industry leaders in cybersecurity and uses the widely trusted OpenVPN protocol. It’s open-source, so anyone can check it for security weaknesses. Meanwhile, Avast SecureLine VPN for macOS and iOS is based on Apple-approved IPSec technology for total integration with your Mac, iPhone, or iPad. If you’re looking to stay anonymous online and encrypt all your internet traffic, Avast’s VPN is very safe.