I would care if they haven't fucked people over and especially the open source community.
this post was submitted on 29 May 2026
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You can self host the LT service as a docker container.
Unfortunately, the browser extension is proprietary. They used to have an open source one but they stopped maintaining it.
Proprietary was a dealbreaker for me. There is no way to verify that it isn't selling everything I type even if I do have it configured to point at a local server.
I'm also concerned that the extension may eventually no longer work against local servers as well.
https://github.com/languagetool-org/languagetool-browser-addon/issues/247
As an alternative, there is harper by wordpress: https://github.com/Automattic/harper
It is webassembly and runs entirely in your browser.
EDIT:
I will add that the rest of the languagetool ecosystem continues to work fine. Libreoffice now has a built in client, which you can point at your own hosted server. VSCode [1] also has their own languagetool extension. I use those and those work great. But in the browser I use ~~harper~~ nothing. I should probably install harper.
[1] Well, technically I use [code-oss]https://wiki.archlinux.org/title/Visual_Studio_Code), which gets the extension from https://open-vsx.org/
Harper is great, but it only does English. Really wish their "extensible core" was extended to other languages sometime.
Seconded Ive never tried anything else but harper works well for me.
Thanks for mentioning harper, hadn't heard of it until now.
Does anyone have any notes on how to self host it and ideally some feedback on what it is to self-host it?
YunoHost application is here: https://apps.yunohost.org/app/languagetool
Docs for installing LanguageTool manually are here: https://dev.languagetool.org/http-server - version 20260528 works on Debian 13 under WSL, needs openjdk-25-jre-headless and the --public option. The extension settings have a localhost option, I didn't have to change anything else.
Note that premium as of today costs $2.50 per month if you pay for two years in advance. Running LanguageTool on a laptop isn't very fast for languages other than English, so paying them for the cloud might provide a better experience than self-hosting.
Thanks a lot! I’d explore that. I don’t know about others here, but I’m not even considering a non-self-hosted solution. But it’s great to know upfront that it would require a powerful server to have languages other than English.
From the accompanying FAQ:
Are there any free alternatives Yes. Our sister brand, QuillBot, offers a free grammar-checking and paraphrasing browser extension that works just as well as LanguageTool for English, French, German, Spanish, Dutch, and Portuguese. Give it a try Quillbot