Open-source spelling and grammar checker for English and about 30 other languages. Add-ons for Chrome, Word and Google Docs, and you can self-host it.
Open sourceEasy to use
Free alternative to
Office & PDF
Code activity
- Stars
- 15,236
- Forks
- 1,601
- Open issues & PRs
- 2,164
- Last commit
- today
Details
- Type
- Open source
- License
- LGPL-2.1
- Written in
- JavaHTMLPythonShell
- Platforms
- Web · Windows · Mac · Self-hosted
- Ease of use
- Easy to use

Pros
- Catches English grammar mistakes well
- Self-host it so your text never leaves your server
Cons
- Doesn't support every language (Vietnamese, for example)
- Advanced sentence rewriting requires Premium
How is the 65/100 "Health" score calculated?
Dorabot computes it weekly from public GitHub data; it is not a review of software quality: 40 points for code freshness (a commit in the last 30 days earns full points), 25 points for popularity by stars, 20 points for a recent release, 15 points for the ratio of open issues to stars. 80+ is Good, 60–79 Fair, below 60 Weak.
FAQ
Is LanguageTool free?
Yes. LanguageTool is open source (LGPL-2.1 license) and free for personal and commercial use.
Which platforms does LanguageTool run on?
LanguageTool is available for Web, Windows, Mac and self-hosting on your own server.
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