Avast Free Mac Security

Avast Security for Mac is a free, lightweight security app that protects in real-time against malware, unsafe websites, dangerous downloads, malicious email attachments, and infected external drives. Detect viruses, spyware, Trojans, and other forms of malware in real-time. And stay protected against dangerous downloads, malicious email attachments, and infected external drives.
Our optional browser add-on fortifies your online security and privacy by alerting you to unsafe websites and blocking web trackers that spy on your browsing habits. Expose weaknesses in your router and connected devices to stop neighbors from piggybacking off your network and criminals from hacking your devices. Avoid interruptions by scheduling scans for when you're sleeping or away from your Mac. Security updates and new features arrive automatically, so you never need to manually update your software. As long as you're connected to the Internet, you'll always have the latest protection.