LanguageTool icon
LanguageTool icon

LanguageTool

Proofreading software compatible with LibreOffice, Word, Firefox, and Chrome. Supports 20+ languages, offering two tiers: free and premium, with features like customizable checks, Microsoft add-on, and error detection in gender, ISBN, and IBAN. Offers open-source web and desktop versions.

LanguageTool screenshot 1

Cost / License

  • Freemium (Subscription)
  • Open Source (LGPL-2.1)

Application type

Platforms

  • Mac
  • Windows
  • Linux
  • Online
  • iPhone
  • iPad
  • Microsoft Edge
  • ONLYOFFICE
  • Google Chrome
  • Microsoft Outlook
  • Safari
  • Visual Studio Code
  • Microsoft Word
  • Eclipse
  • TinyMCE
  • Google Docs
  • Thunderbird
  • Vim
  • Cloudron
  • Sublime Text
  • GNU Emacs
  • Opera
  • Gmail
  • LibreOffice
  • Apache OpenOffice
  • Mozilla Firefox
  • LibreOffice - Writer
LanguageTool screenshot 1
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LanguageTool alternatives  
189likes
127alternatives
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Comments and Reviews

   
Comment summary: LanguageTool earns praise for accurate multilingual grammar and spell checking, fast performance, open-source availability, offline tools, and integrations with LibreOffice, Overleaf, browsers, and editing workflows. Users also value HTML preservation and account-free access. Criticism includes occasional slow loading, limited language quality, inflexible rules, privacy and ownership concerns, and a reported shift of browser extensions and advanced features behind a Premium paywall.
Top Positive Comment
ivm
6

Private + open source + free to run your own instance? That's amazing.

PostureQ1
Replying to @ivm

LanguageTool browser addon is no longer open source. Only the desktop app is open source.

Top Negative Comment
PostureQ1
10

LanguageTool does not respect your privacy as they claim, they actually store and have real people reading what you type in certain occasions, and they also track you through multiple devices using Google Analytics. I will post two texts that were taken from their page about privacy, you can read it all at https://languagetool.org/legal/privacy.

“If you explicitly ignore corrections, we log the internal rule id of that error and the text fragment marked as incorrect (i.e. the small part of the sentence that was underlined as an error) and 15 characters to the left and to the right of the fragment. This enables us to analyze and avoid false alarms.”

“This website uses Google Analytics, a web analysis service of Google LLC ("Google"). The use includes the "Universal Analytics" operating mode. This makes it possible to assign data, sessions and interactions across multiple devices to a pseudonymous user ID and thus analyze a user's activities across devices.”

akselaeration
0

I think Languagetool is good, but they transparency.. They are NOT German or EU really, yes, they are located in Potsdam, Germany but THEY ARE OWNED BY Learneo, USA. Same owners as Quillbot, Scribbr and other Writing Tool apps... SO German, EU is just a "brand", not truth.. "an online learning platform of academic resources; LanguageTool" https://www.linkedin.com/company/learneoinc/about/

Elemental Tec
2

A solid, AI-powered proofreading tool that shines with its multilingual support. It offers context-aware suggestions, tone detection, and smooth integration with browsers, word processors, and email clients. That said, some edits can feel overly fussy, and the interface, though practical, lacks the polish of rivals. The free version covers the basics, but advanced features, like detailed style tips and plagiarism checks, require a Premium subscription. As of February 2026, even the browser extension is now exclusive to paying users.

AmkiTakk
0

LanguageTool was the best spellcheck extension for multilingual users, however their extension is now for Premium users only, rendering it useless to any Free user. Quality-wise, it's good, but I can't recommend it considering the new paywall. I hope I can find a true, mulitlingual alternative someday...

Guest
0

Premium subscriptions are handled by LanguageTool GmbH, which is owned by US-based Learneo.

Review from a new or low-activity account — shown here, but not counted in the app rating.
Bulletproof
0

Brilliant correction of sentences on Windows! 10/10

7 of 17 comments

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Official Links

AppStores & Other Links

Download from Mac App Store
Download from Microsoft Store

Install from the command line

  • winget install -e --id Learneo.LanguageTool
  • brew install languagetool

Be careful what you paste into a terminal. Check what a command installs before running it.

What is LanguageTool?

LanguageTool is a free proofreading software compatible with multiple applications like LibreOffice, Microsoft Word, Firefox, and Google Chrome. It supports around 20 languages and can be customized. It has two versions: free and premium. The free version has a 10,000 character limit per check and can identify errors in multiple languages. The premium version increases the character limit to 100,000, adds a Microsoft Word add-on, and can detect more errors. It also includes features like incorrect gender usage detection in German and incorrect checksums detection in ISBN and IBAN numbers. The web and desktop versions are open source, but the browser extensions are not.

LanguageTool information

  • Developed by

    US flagLearneo, Inc.

  • Licensing

    Open Source (LGPL-2.1) and Freemium product.

  • Pricing

    Subscription ranging between $4 and $8 per month + free version with limited functionality.

  • Written in

  • Rating

    Average rating of 3.8 (20 ratings)

  • Alternatives

    127 alternatives listed

  • Badge

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  • Supported Languages

    • English
    • French
    • German
    • Spanish
    • Arabic

AlternativeTo Categories

Web Browsers, Education & Reference, AI Tools & Services

Apple AppStore

  •   Updated 
  •   4.81 avg rating

GitHub repository

  •  15,118 Stars
  •  1,583 Forks
  •  2152 Open Issues
  •   Updated  
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Our users have written 17 comments and reviews about LanguageTool, and it has gotten 189 likes

LanguageTool was added to AlternativeTo by milek_pl on and this page was last updated .