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Nice, I use AdGuard (on mobile and desktop), would this be a suitable replacement?

AdGuard for Mac is the same offering (not to be confused with AdGuard for Safari, which is a browser extension):

There's also Little Snitch Mini:

This snitch is proprietary crapware. Instead, use OpenSnitch when on Linux and LuLu Firewall when on Mac.

It's proprietary but quality software. LuLu is cool but doesn't offer the same functionality.

Any differences in performance or how well each works for adblocking compared to the others?