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LanguageTool

Grammar, style and spelling checker for 30+ languages with AI rephrasing; open-source core you can self-host.

  • LanguageTooler GmbH
  • Local or cloud
  • Free tier · paid plans
  • Open source

Official site · Source code

Where it ranks

  • –
    Writing
    Apps · Local · no rated model available here yet

Tools without a benchmark of their own inherit the tier of the best model they offer.

Facts

Vendor
LanguageTooler GmbH
Approach
Apps
Where it runs
Runs fully on your hardware with local models; cloud models optional
Interface
Web app, API, Self-hosted web UI
Skill level
Beginner: works out of the box
Price
Free tier · paid plans
Pricing notes
Basic free (2,000 characters per field, 3 AI rephrasings/day); Premium prices did not render. Open-source checker can run as your own HTTP server; AI rephrasing is cloud.
Source code
Open source (LGPL-2.1)
GitHub stars
15.2k (19 Oct 2026)
Last verified
19 Oct 2026

Price from languagetool.org, 19 Oct 2026.

Models it gives you

No models recorded yet.

Sources