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LanguageToolVale
Freemium

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

 Free

The open-source software is available without a license fee. Hosting, hardware and…

Windows, macOS, Linux, Web, Self-hosted, Browser extension Windows, macOS, Linux, Command line
  • The checking engine is open source and can be self-hosted offline
  • Covers far more languages than most grammar checkers
  • Runs style checks in editors, scripts or continuous integration.
  • The hosted service sends your text to their servers unless you self-host
  • Advanced style suggestions and long texts need a paid plan
  • You need to choose or write the style rules it enforces.
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 September 22, 2026

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