LanguageTool
Proofread more than 20 languages. It finds many errors that a simple spell checker cannot detect.
Actively maintained with regular releases.
Commit activity more than 89% of tracked projects; popularity more than 84%. How this is calculated.
Commits, last 11 months
| Stars | 15k |
|---|---|
| Latest release | — |
| Repo updated | 27 Sept 2026 |
| Licence | LGPL-2.1 |
| Built with | Java, Docker |
Is LanguageTool actively maintained?
Over the last 11 months the project absorbed 2012 commits, of which 465 arrived in the most recent quarter — roughly 155 commits a month.
No tagged releases are published, so there is no stable version to pin to — you would deploy from the default branch or a container image built from it.
Of the 77 projects we track in Miscellaneous, LanguageTool ranks #10 by health score — in the top quarter of its category.
What LanguageTool actually does
LanguageTool is an open-source proofreading engine designed to detect grammatical, spelling, and stylistic errors across more than twenty languages. It catches complex mistakes that traditional spell checkers typically miss by analysing sentence structure and context. This self-hosted variant allows you to run your own grammar checking service locally or on your private infrastructure.
Best fit: It suits privacy-conscious teams or individuals who need to process sensitive text internally without sending data to third-party cloud correction services.
Worth knowing: Running a Java-based natural language processor locally can demand significant memory and CPU resources depending on your concurrency levels.
Deployment notes
You will typically deploy this via Docker and configure persistent storage for custom dictionaries or models, alongside a reverse proxy to handle incoming TLS traffic.
Links
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