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LanguageToolwrite-good
Freemium

A free tier is available and the engine is open source. Premium features are paid.

 Free

Free and open source under the MIT license.

Windows, macOS, Linux, Web, Self-hosted, Browser extension Command line
  • The checking engine is open source and can be self-hosted offline
  • Covers far more languages than most grammar checkers
  • Returns suggestions for prose edits
  • Checks can be customized or disabled
  • The hosted service sends your text to their servers unless you self-host
  • Advanced style suggestions and long texts need a paid plan
  • Focused on English prose
Browser extension, Downloadable app, Self-hosted Downloadable app
Open source Open source
License: LGPL-2.1 License: MIT
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.