LanguageTool
A grammar, spelling, and style checker from Germany that supports more than 30 languages. The core engine is open source and can be self-hosted, and the company processes data in Germany under GDPR - a privacy-respecting European alternative to Grammarly.
Quick facts
The core grammar engine is open source and self-hostable, and it covers over 30 languages – far more breadth than most Grammarly-style competitors offer.
The free tier's suggestions are noticeably more basic than Grammarly's, and the more advanced AI rewriting features sit behind a paid plan.
Why does it score 100?
Incorporated in Potsdam, Germany – a full EU member state.
Independently owned by LanguageTooler GmbH, with no outside investors or holding company.
LanguageTool processes text on its own servers in Germany rather than a third-party cloud.
The core checking engine is open source and self-hostable, while the premium AI features stay proprietary, so it's only partially open source overall.
See how they compare
LanguageToolWhat does it replace?
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