Split tunneling - choose which apps use the VPN and which apps don’t when you’re connected to ExpressVPN.Network Lock kill switch - if your VPN connection drops unexpectedly, ExpressVPN prevents your network traffic from being exposed to third parties.OpenVPN as standard - the ExpressVPN app for Mac uses OpenVPN, the VPN protocol that provides the most security and the highest performance, by default.ExpressVPN is a secure Mac VPN client for Monterey, Big Sur, Catalina, Mojave, and High Sierra.