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LanguageTool

Multilingual grammar, spelling and style checker for 30+ languages

Freemium · $25AI writing
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LanguageTool is an AI writing tool for Freelancers and Creators, offered as freemium ($25/mo). Based in Germany. Popular alternatives include Gamma, Willow, Grammarly.

About LanguageTool

LanguageTool is a grammar, spelling and style checker that works in more than 30 languages. Daniel Naber started it in 2003 as an open-source project during his computational linguistics studies in Germany, and it became a business when he teamed up with Christopher Blum through LanguageTooler GmbH in Potsdam. In April 2023 it was acquired by Learneo, the US education company that also owns QuillBot.

It runs as browser extensions, desktop apps for macOS and Windows, add-ins for Microsoft Word, Outlook and Google Docs, and an online editor. Since spring 2026 the browser extension requires Premium, so the free Basic plan mainly covers core checks in the web editor, up to 2,000 characters per text. Premium raises the limit to 150,000 characters per check, unlocks thousands of extra style and grammar rules for English, German, French, Spanish, Dutch, Polish and Portuguese, and adds unlimited paraphrasing and a personal style guide. Team plans add user management and a shared dictionary and style guide.

LanguageTool fits people who write in several European languages and want one checker for all of them. Its English suggestions are less extensive than Grammarly's, and it lacks Grammarly's tone and generative features. QuillBot is stronger for paraphrasing and Wordtune for rewriting whole sentences, but neither matches LanguageTool's language range.

A practical tip: the open-source engine can be self-hosted for privacy-sensitive use, though without Premium's extra rules. Premium costs $24.90 monthly or $69.90 yearly, with a 14-day trial and a 14-day money-back guarantee.

Key features of LanguageTool

  • Grammar, spelling and punctuation checks in more than 30 languages
  • Thousands of extra Premium rules for seven major European languages
  • AI paraphrasing to rephrase sentences for clarity or tone
  • Personal style guide plus a shared team dictionary and style guide
  • Browser extensions for Chrome, Firefox, Edge and Safari
  • Add-ins for Microsoft Word, Outlook and Google Docs
  • Desktop apps for macOS and Windows plus an online editor
  • Open-source core engine that can run on your own server

Pros and cons

Pros

  • Covers far more languages than Grammarly, including German, French and Spanish
  • Detects language automatically, so mixed-language writers need no switching
  • Yearly Premium costs much less than most premium grammar tools
  • Self-hostable open-source engine for privacy-sensitive setups
  • Works in most places you write through extensions and add-ins

Cons

  • Browser extension now requires Premium; free use is web-only
  • English style suggestions are thinner than Grammarly's
  • No Turkish support
  • Monthly Premium billing is expensive compared with yearly
  • Self-hosted engine lacks the Premium rule set

LanguageTool pricing

LanguageTool uses a freemium model. A 14-day free trial is available.

PlanPriceIncludes
Basic$0Web editor only, 2,000 characters per text, core checks
Premium$24.90 / mo$69.90 billed yearly; 150,000 characters, browser extension
TeamCustomPer-user price set by seat count (2 to 1,000) at checkout

Source: languagetool.org · checked on Oct 20, 2026

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How LanguageTool compares in AI writing

Rank by votes
#1 / 23

0 votes from members

Starting price
$25

13% above the category median ($22/mo)

Free alternatives
1

Free or open-source tools in AI writing

LanguageTool ranks #1 of 23 ai writing tools by community votes and is priced above most tools in the category.

Common use cases

  1. 1Proofreading emails and documents written in a second language
  2. 2Checking marketing copy in several European languages
  3. 3Academic writing and theses in English, German or French
  4. 4Keeping team terminology consistent with a shared dictionary
  5. 5Self-hosted grammar checking for internal or regulated content

Best for

Writers and teams who work in several European languages and want one affordable checker across browser, Office and Google Docs.

Not ideal for

English-only writers who want the deepest tone and generative features (Grammarly) or Turkish proofreading.

Integrations

  • Google Docs
  • Microsoft Word
  • Microsoft Outlook
  • LibreOffice
  • Chrome
  • Firefox
  • Safari
  • Thunderbird

Our take

LanguageTool is the best-value grammar checker for multilingual writers, especially in German, French, Spanish and Portuguese. Use the free plan for occasional checks and buy Premium yearly; English-only teams should still compare it with Grammarly.

FAQ

What is LanguageTool?
LanguageTool is an AI writing tool: Multilingual grammar, spelling and style checker for 30+ languages.
How much does LanguageTool cost?
LanguageTool uses a Freemium model; paid plans start at $25 per month.
What are the best alternatives to LanguageTool?
Community-listed alternatives to LanguageTool include Gamma, Willow, Grammarly, DeepL.
Does LanguageTool have a free trial?
Yes, LanguageTool offers a 14-day free trial.
What does LanguageTool integrate with?
LanguageTool integrates with Google Docs, Microsoft Word, Microsoft Outlook, LibreOffice, Chrome, Firefox and more.
Which platforms does LanguageTool support?
LanguageTool is available on web, macos, windows, ios.
Who is LanguageTool for?
Writers and teams who work in several European languages and want one affordable checker across browser, Office and Google Docs.

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