Rubbernet is described as 'Keeps an eye on all network-enabled apps running on your Mac. It provides real-time monitoring so you can keep an eye on the exact state of your live network connections. With the Activity sidebar, you'll be able to see which applications are currently' and is a Network Monitor in the network & admin category. There are five alternatives to Rubbernet for Mac, Windows, Linux, Android and iPhone. The best Rubbernet alternative is Little Snitch. It's not free, so if you're looking for a free alternative, you could try OpenSnitch or ZoneAlarm Firewall. Other great apps like Rubbernet are Radio Silence and Flying Buttress.
Firewall application for monitoring and controlling outbound network connections, notifying users of attempted access, supporting rule-based blocking, real-time alerts on suspicious activity, and preventing unauthorized data transmission on macOS systems.
Provides two-way firewall protection by blocking unauthorized network access, detecting intrusions, hiding devices from threats, stopping viruses, spyware, and data theft, offering real-time alerts, customizable rules, and simple setup with light system impact.
Radio Silence lets you block individual apps from accessing the internet. It never throws pop-ups on the screen, and is completely invisible.
As Apple's built-in Firewall preferences improves in both functionality and security, I will be aiming Flying Buttress more at users who need the advanced firewall configuration, logging, and IP sharing options found in Flying Buttress.
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Rubbernet monitors bandwith consumed by individual apps and which files are in use, while Radio silence just allows or denies it