I've been pretty happy with Lockdown for iOS. https://lockdownhq.com/about https://lockdownhq.com/about Open source and free. Don't be confused by the VPN serv

I've been pretty happy with Lockdown for iOS. https://lockdownhq.com/about https://lockdownhq.com/about Open source and free. Don't be confused by the VPN service they also offer for a price. You just want the local firewall functionality.