I got a banner warning today linking to this page. It was announced a while back, but I either didn’t see it or forgot.
We have made the difficult decision to limit the use of LanguageTool’s browser extension to Premium users only. The rise of generative AI has made it more challenging to sustainably monetize our offering. A majority of users use our products for free, and the relatively small percentage of Premium subscribers is all that is subsidizing our continuously increasing server costs. To improve our Premium experience and to sustain our business model, we’ll be making the LanguageTool browser extension available exclusively for paying customers.
The key bit for people who can selfhost:
Yes. If you are a developer, you can still host and run your own instance of LanguageTool’s server. The browser extension will continue to work as it currently does for users who use it with their own server.
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
--publicoption. 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.
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.
Seconded Ive never tried anything else but harper works well for me.
Harper is great, but it only does English. Really wish their “extensible core” was extended to other languages sometime.
Thanks for mentioning harper, hadn’t heard of it until now.
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
