LanguageTool

Open-source grammar, style and spell checker

LanguageTool checks grammar, style and spelling in more than 20 languages. The core engine is open source and can run locally; the hosted service has a free tier and a paid Premium plan.

Free alternative to

Grammarly

Details

Status	Open source
Licence	LGPL-2.1
Platforms	Windows, macOS, Linux, Web, Browser extension
GitHub stars	15,159 (2026-10-19)
Last commit	2026-10-18
Category	Writing & typesetting
Website	languagetool.org
Source	github.com

Is this your tool?

Feature LanguageTool at the top of its category and alternatives pages.

Get featured

Related tools

Typst

Writing & typesetting

Modern markup-based typesetting system

Stars: 57k
Licence: Apache-2.0
Status: Open source

Alternative to Overleaf Premium

Overleaf Community Edition

Writing & typesetting

Self-hostable collaborative LaTeX editor

Stars: 18k
Licence: AGPL-3.0
Status: Open source

Alternative to Overleaf Premium

LibreOffice

Writing & typesetting

Free office suite from The Document Foundation

Stars: 4.5k
Licence: MPL-2.0
Status: Open source

Alternative to Microsoft Office

TeXstudio

Writing & typesetting

Feature-rich desktop editor for LaTeX documents

Stars: 3.7k
Licence: GPL-3.0
Status: Open source

Alternative to Overleaf Premium

LanguageTool

Free alternative to

Related tools

Typst

Overleaf Community Edition

LibreOffice

TeXstudio

ResearchAlts Weekly