Avast Mac Security offers three shields and on-demand scanning. Our Web Shield and Mail Shield combine to check the vast majority of incoming data from the Internet, while File Shield scans all programs stored and executed from your hard drive. Avast tied with Kaspersky net security for Mac, Sophos domestic for Mac and Norton security, which also all scored 99.17 percent, and did better than Avira loose Antivirus for Mac, which stopped 93.33 percentage. There is a Boot-time scan function wherever users may routine boot-time scan to remove disease attacks covered when Windows.Avast startup features a Chest Disease or is known as a quarantine process folder to keep contaminated files. Avast forums indicated that there is a bug in this update, after three reboots my computer got completely stuck when trying to access the 'repair' function so I phoned Avast tech # given on bottom. As one of the most popular antivirus packages for Mac, Avast has a large name to live up to. And with 100% detection rates from AV-TEST and AV-Comparatives, it has the chops to go head-to-head with more expensive software like Norton.