It’s only self hosted when you have more then 250 users :(
There's the open source part of it: https://github.com/languagetool-org/languagetool
Not sure if it's missing any notable features of the SAAS product.
Not sure if it's missing any notable features of the SAAS product.
You could try a locally self-hosted instance of https://languagetool.org/ to avoid sending all your online typing to an extra party.