Download it now for your Mac with macOS 10.13 (Sierra) and later versions! For additional features get our Free Security Suite, including free Antivirus for Mac, free Phantom VPN to secure and anonymize your online surfing, Avira Browser Safety (on Firefox) to block ads and browser trackers. Best free antivirus for Mac: Avast Free Mac Many antivirus suites provide a decent level of protection, but a few rise above all others by providing the very best in performance. Includes a 30 day trial of Sophos Home for Mac Premium, with advanced ransomware scanning in real time. Sophos Home for Mac Antivirus - Free Download.