Languagetool

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LanguageTool is an open-source proofreading software that provides style and grammar checking for over 25 languages. It identifies errors that simple spell checkers often miss.

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At a glance

Pricing

Open Source

Free tier

Yes

API

Yes

Skill level

Mixed

About

What is languagetool?

LanguageTool is an open-source proofreading software designed to identify grammar and style errors across more than 25 languages, including English, Spanish, French, German, and Polish. Unlike basic spell checkers, it offers advanced detection capabilities for a wide range of linguistic issues. The core software is freely available under the LGPL 2.1 license, making it a flexible solution for developers and users alike. It can be run as a standalone application, a command-line tool, or a server, and also integrates as an Office extension. The project encourages community contributions for developing new error detection rules and offers extensive documentation for both users and developers.

Best used for

Ideal for writers who need to ensure grammatical correctness and stylistic consistency across various languages, and for developers looking to integrate robust proofreading capabilities into their applications. Especially valuable for open-source enthusiasts and those requiring a customizable, self-hosted solution for language analysis.

Common actions

proofread text

check grammar

improve writing

integrate language tools

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Capabilities

Key features

Grammar checking
Style checking
25+ languages
HTTP API
Office extension
Command-line tool
Standalone application

Target Audience

writerdeveloper

Integrations

libreofficeopenoffice

Pricing & Plans

Open Source

Free

FAQs

What languages does LanguageTool support?

LanguageTool supports over 25 languages, including major ones like English, Spanish, French, German, Portuguese, Polish, and Dutch. Its open-source nature allows for continuous expansion and improvement of language support through community contributions.

Can I run LanguageTool on my own server?

Yes, LanguageTool can be run as a standalone server. The project provides documentation on how to set up your own LanguageTool server, offering flexibility for integration into custom applications or for private use.

Is LanguageTool truly open source?

Yes, the core of LanguageTool is freely available under the LGPL 2.1 or later license. This means users can access, modify, and distribute the software, fostering a community-driven development model.

Does LanguageTool offer an API for integration?

Yes, LanguageTool provides an HTTP API, allowing developers to integrate its proofreading capabilities into their own applications and services. Documentation for using the public server via HTTP is also available.

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