DefenseWall is described as 'Sandboxing-style personal firewall solution that wins when your anti-virus fails. DefenseWall is based on a sandboxing approach that uses rights restrictions and partial virtualization' and is an app. There are more than 10 alternatives to DefenseWall for a variety of platforms, including Windows, Linux, Android, iPhone and KDE Plasma apps. The best DefenseWall alternative is TinyWall, which is both free and Open Source. Other great apps like DefenseWall are Gufw, Windows Firewall Notifier, ZoneAlarm Firewall and Privatefirewall.