[sudouser]

you only need to pay every 3-5 years aaaaand only if you want to upgrade, aaaaaaand you can keep using your last updated version, aaaand only 50% of the full price

[pilsetnieks]

You can't, if you also want to upgrade your OS. v3 doesn't work on High Sierra.

[Udo_Schmitz]

It does: https://www.obdev.at/products/littlesnitch/releasenotes3.htm...

[sudouser]

yep, they even did some fixes for Yosemite