languagetool-org/languagetool
Style and Grammar Checker for 25+ Languages observed · 2026-08-28
Health v2 · maintenance only
77/100
- Activity 99
- Release rhythm 35
- Longevity 100
Flags: no_releases
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 4773
- days_rel: n/a
- days_push: 7
- n_releases_24m: 0
Adoption not part of the score
14875 stars · 1565 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
LanguageTool is an open-source proofreading engine that checks grammar, spelling, and style in 25+ languages. It ships as a Java library, a standalone desktop app, a self-hostable HTTP API server, and browser add-ons.
Use cases
- check grammar and spelling in text
- self-host a grammar checking API server
- integrate proofreading into a Java application
- add grammar checking to a browser or editor
- proofread multilingual writing
- detect style and typography issues beyond spellcheck
When to choose
- you need multilingual grammar and style checking with a self-hostable API
- you want an open-source proofreading core you can embed or extend with custom rules
- you need offline or privacy-respecting grammar checking
When to avoid
- you only need basic spellcheck with no grammar rules
- you want a fully managed SaaS with AI paraphrasing and premium rules without self-hosting
- your stack cannot run a JVM service
Facets
library · maturity stable
nlp http-server sdk developer-tools apis jvm cross-platform self-hosted browser-extension grammar-checker spellcheck proofreading style-checker multilingual http-api natural-language-processing docker
5 sources
- readme: https://github.com/languagetool-org/languagetool · fetched 2026-08-28 · a8ecdd555a6b
- homepage: https://languagetool.org · fetched 2026-08-29 · 8c47ca722727
- site_page: https://languagetool.org/google-docs · fetched 2026-08-29 · b8fc8f64d14b
- site_page: https://languagetool.org/about · fetched 2026-08-29 · 703e9dba1a9a
- site_page: https://languagetool.org/premium · fetched 2026-08-29 · ff4544c5ad1b
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| languagetool-org/languagetool | main | 77 |
For agents
markdown · JSON · MCP: product_card(name="languagetool-org/languagetool")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem