Price: $15 or $20 | "The new appfirewall for macOS 11 Big Sur Vallum 4 offers a new way to protect your privacy and to increase your Mac’s security. Vallum 4 is based on the new macOS System Extensions API, it’s designed for Big Sur and runs natively on all Apple computers. Vallum 4 is fast, light and easy to use. ONLINE HELP See what’s new: Inbound filtering and popup alerts for inbound connections Match connections by hostname or domain Fully customizable inbound and outbound rulesets Optimize your rules using groups, apps groups or matching apps by signature type or by developer Rules conditions based on current network settings like SSID and interface Powerful rules editor Improved popup notifications" #firewalls #macOS_11_and_up #in-depth