use blockblock and littlesnitch together

The application (version 4) received a positive 4.5/5 review from Macworld. Little Snitch's integral network monitor shows ongoing traffic in real time with domain names and traffic direction. The dialog also allows the user to restrict the parameters of the connection, for example allowing a given application to only connect to a certain domain or using a specific protocol or port. Little Snitch takes note of this activity and allows you to decide for yourself what happens with this data. As soon as your computer connects to the Internet, applications often have permission to send any information wherever they need to. When an application or process attempts to establish a network connection, Little Snitch presents a dialog that allows the user to deny or permit the connection once, for a limited time, or permanently. TCPBlock is a lightweight and fast application firewall you can prevent selected applications on your computer from opening connections to the network. Little Snitch gives you control over your private outgoing data. Until Little Snitch 4, it controlled network traffic by registering kernel extensions through the standard application programming interface (API) provided by Apple, but at version 5 it switched to using Apple's Network Extensions due to the deprecation of kernel extensions on macOS Catalina. Unlike a stateful firewall, which is designed primarily to protect a system from external attacks by restricting inbound traffic, Little Snitch is designed to protect privacy by limiting outbound traffic. It is produced and maintained by the Austrian firm Objective Development Software GmbH. If you’ve already been using Little Snitch and have your own rules defined here, you should create a new profile and move those rules into it. Little Snitch allows tremendous flexibility in managing what the applications and processes running on your Mac can communicate to over the network and Internet. It can be used to monitor applications, preventing or permitting them to connect to attached networks through advanced rules. The first step is to make sure that, in the Little Snitch rule editor, only the default and system rules are present under Effective in all profiles.

Little Snitch is a host-based application firewall for macOS.

Use blockblock and littlesnitch together