LanguageTool - Online Grammar, Style & Spell Checker
languagetool.org
external-link
LanguageTool is a free online proofreading service for English, German, Spanish, French, and more than 20 other languages.

The extension is not libre, though.

They have an older extension here that is free, but it hasn’t been updated since 2018.

@HMH
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610M

Also checkout https://github.com/valentjn/ltex-ls which enables grammar checking in markdown, latex and more based on languagetool.

@gmate8
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610M

Yes I use it too, it’s pretty amazing

Adda
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110M

Agreed. I can truly recommend this one.

Gritty
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510M

https://languagetool.org/legal/privacy

Privacy policy seems okay, but I’m still skeptical. Probably way better than grammarly.

@MarcellusDrum
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510M

The self-hosting option should satisfy the overly skeptical

You can also download it as standalone application, it’s in many distribution repositories.

down daemon
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410M

Just trying it now seems pretty cool

@xarvos
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Works on plaintext too. I used it to grammar check my thesis.

@vis4valentine
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This one is very helpful. I always use the extension.

Greensky
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210M

I will try this one

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