I use LuLu https://objective-see.com/products/lulu.html a free, open source alternative. Was interested in little snitch but this has been working okay

I’ve tried Little Snitch, but was quickly annoyed at the high interaction required. Maybe I should give it another shot, especially since I use uMatrix on Firefox, which is a similar concept.

It's overwhelming for the first couple of days, as periodic jobs wake up and ask for permission to connect to the Internet. Once you're over that initial hump, it basically disappears until some new app wants to connect to something unexpected.

How do you trust Little Snitch?

You can use Lulu it’s an open source alternative to little snitch. https://objective-see.com/products/lulu.html