Writing & Marketing

LanguageTool

Style and Grammar Checker for Over 25 Languages

Status
Generally available
Last checked
Checked · Oct 11, 2026
License
Open source
Pricing
Free tier · from $0
Visit LanguageTool Compare with alternatives

What it is

LanguageTool is an open-source grammar and style checker that supports over 25 languages. It helps users improve their writing by identifying grammatical errors, stylistic issues, and inconsistencies.

LanguageTool stands out as a comprehensive, open-source solution for multilingual grammar and style checking, offering broad language support and flexibility in integration.

When it fits — and when it doesn’t

A good fit for

  • Teams needing multilingual grammar and style checking capabilities

  • Individuals who write frequently in multiple languages and require consistent feedback on their writing quality

Look elsewhere if

  • Projects requiring real-time text correction with low latency requirements

  • Applications that need highly specialized linguistic analysis beyond basic grammar and style checks

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Limited real-time performance for large documents

    LanguageTool can be slow when checking long texts, leading to delays in feedback

  2. 02

    Complex setup for integration into custom applications

    Requires Java environment and configuration of multiple dependencies to integrate effectively with non-Java projects

  3. 03

    Accuracy varies significantly across supported languages

    Some less commonly supported languages may have fewer rules and lower accuracy compared to major languages like English or German

What it does well

  • Supports over 25 languages for grammar and style checking

  • Open-source with active community contributions

  • Available as a library, desktop application, or web extension

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

How Fast Is It?

Set up LanguageTool

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →
Get the badge

A small badge for LanguageTool’s README or site: its name, “Tracked on AI Navigator”, and the availability status and check month from this page. It updates as the catalog does.

LanguageTool — tracked on AI Navigator

Markdown

[![LanguageTool — tracked on AI Navigator](https://navigateaitools.com/badge/languagetool.svg)](https://navigateaitools.com/explorer/tool/languagetool)

HTML

<a href="https://navigateaitools.com/explorer/tool/languagetool"><img src="https://navigateaitools.com/badge/languagetool.svg" alt="LanguageTool — tracked on AI Navigator" height="58"></a>