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EloquentLanguageTool
Free

Free and open source under the GPL-3.0 licence.

 Freemium

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

Linux Windows, macOS, Linux, Web, Self-hosted, Browser extension
  • Works fully offline
  • Supports more than 20 languages
  • The checking engine is open source and can be self-hosted offline
  • Covers far more languages than most grammar checkers
  • Linux only
  • Small project with a short commit history
  • The hosted service sends your text to their servers unless you self-host
  • Advanced style suggestions and long texts need a paid plan
Downloadable app Browser extension, Downloadable app, Self-hosted
Open source Open source
License: GPL-3.0 License: LGPL-2.1
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked October 1, 2026

Checked September 22, 2026

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