LanguageTool

A multilingual grammar and style checker with an open-source core you can also run yourself.

Free plan + paidOpen sourceSelf-hostableAI writing assistants

Verified facts: 5 of 5
Alternatives ranked: 6
Approved reviews: 0
Visits sent from here: 0

About LanguageTool

LanguageTool checks grammar, spelling, punctuation and style in more than 30 languages, with its strongest support for English, German, Spanish, French, Dutch and Portuguese. That multilingual depth is the main reason people pick it over English-first tools. It runs as browser extensions, add-ins for Word, Google Docs and LibreOffice, desktop apps for Windows and macOS, and an iOS app, plus a proofreading API for developers. The free tier checks shorter texts with core rules; Premium raises the character limit per check, adds picky style rules, a paraphraser and team features. Unusually for this category, the checking engine is open source under the LGPL, so privacy-minded users and companies can run their own LanguageTool server and point the extensions at it, though the self-hosted version lacks some of the AI-powered premium checks. Suggestions are solid but less opinionated about tone than Grammarly.

Best for: People who write in several languages, or who want a checker they can self-host.

What works

Strong support for over 30 languages
Open-source engine can be self-hosted
Works in Word, Google Docs, LibreOffice and browsers

Why people leave

Free tier caps text length per check
Self-hosted version lacks the premium AI checks
Tone and rewriting help is lighter than AI-first tools

Top LanguageTool alternatives

See all 6

1
Grammarly
More polished tone and clarity suggestions if you write mostly in English.
66.5
2
Harper
Lighter open-source checker that runs fully offline with no server to maintain.
62.6
3
Antidote
Deeper English and French correction with built-in dictionaries, installed locally.
59.6
4
Linguix
Comparable browser checker with a low-priced Pro plan.
57.2
5
Sapling
Offers a self-hosted enterprise option plus an API for building checks into products.
55.3

Why people left LanguageTool

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LanguageTool: common questions

Is LanguageTool free?

LanguageTool has a free plan and paid plans.

Is LanguageTool open source?

Yes. The source code is on GitHub at languagetool-org/languagetool. You can also run it on your own server.

What platforms does LanguageTool run on?

LanguageTool is available for Web, Windows, macOS, iOS, Browser extension and Self-hosted.

What are the best alternatives to LanguageTool?

The highest-ranked LanguageTool alternatives right now are Grammarly, Harper and Antidote. See the full ranked list for pricing, platforms and verified facts.

See all 6 LanguageTool alternatives

LanguageTool facts

5 of 5 verified

Languages: More than 30; Checked Oct 25, 2026languagetool.org(opens source in a new tab); “LanguageTool grammar checker masters more than 30 languages and dialects.”
License: LGPL-2.1; Checked Oct 25, 2026github.com(opens source in a new tab); “License: LGPL-2.1 (GNU Lesser General Public License v2.1).”
Characters per check: 2,000 free / 150,000 Premium; Checked Oct 25, 2026languagetool.org(opens source in a new tab); “Character limit per text field 2,000 150,000”
Money-back guarantee: 14 days; Checked Oct 25, 2026languagetool.org(opens source in a new tab); “LanguageTool offers a 14-day money-back guarantee for all Premium packages.”
Desktop and mobile apps: Windows, macOS, iOS; Checked Oct 25, 2026languagetool.org(opens source in a new tab); “In addition, the LanguageTool editor including text checker is available as an app for Windows, macOS and iOS if you register for a free LanguageTool account.”