Alternatives to LanguageTool
Open source multilingual grammar
LanguageTool ranks #4 of 9 in AI writing assistants, with an Alt Score of 82. It is licensed under LGPL-2.1-or-later, open source with paid hosting and available on Web, Browser extension, Windows and macOS. 8 of 10 checklist rows are verified against a public source.
Writers, students, professionals, and organizations who write in English, German, Spanish, French, or one of 30+ other supported languages and want an automated check on their text before sending or publishing it.
LanguageTool checks spelling, grammar, punctuation, and capitalization, and flags style issues like redundant or overused phrasing. It also offers paraphrasing suggestions to rewrite sentences as more formal, concise, fluent, or simple. A free tier covers basic spelling and punctuation checks, while Premium adds more advanced grammar and style detection. It has open-source roots and also offers a developer API.
You install a browser extension, desktop app, or office/email plugin (Chrome, Firefox, Word, Google Docs, Outlook, etc.), and it underlines errors and suggests corrections as you type; you can also paste text directly into the web checker or call the API.
Why people leave LanguageTool
Dashed reasons are sourced facts; the rest are opinions. Vendors can dispute.
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Ranked alternatives
Ordered by Alt Score. Click any score to see the breakdown.
Feature comparison
Rows come from the AI writing assistants checklist (14 rows). Human-verified cells only. ? means the value has not been verified.
| AI writing assistants checklist | LanguageTool | Grammarly | QuillBot | Jasper | DeepL Write | ProWritingAid |
|---|---|---|---|---|---|---|
| Pricing model | ||||||
| Starts at | ||||||
| License | ||||||
| Platforms | ||||||
| Grammar & spelling | ||||||
| Style / tone rewriting | ||||||
| Long-form generation | ||||||
| Plagiarism detection | ||||||
| Browser extension | ||||||
| Office / Docs integration | ||||||
| Self-hostable | ||||||
| Free tier limits | ||||||
| Multilingual | ||||||
| Data used for training (opt-out) |
Every fact and feature listed for LanguageTool is verified against its own pages. Each alternative is sourced on its own page.
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Platforms Web, Browser extension, Windows, macOS verified 2026-07-10
LanguageTool adds advanced spelling, grammar and style correction to Windows and many other services and apps.
https://languagetool.org/windows -
License LGPL-2.1-or-later verified 2026-07-10
The LanguageTool core (this repo) is freely available under the LGPL 2.1 or later.
https://github.com/languagetool-org/languagetool -
Pricing model OSS + paid hosting verified 2026-07-10
OSS core (LGPL) + paid Premium cloud.
LanguageTool is open-source proofreading software for English, Spanish, French, German,
https://github.com/languagetool-org/languagetool -
Status active verified 2026-07-10
## 6.7 (2025-10-01)
https://github.com/languagetool-org/languagetool/blob/master/languagetool-standalone/CHANGES.md -
Grammar & spelling Yes verified 2026-07-10
Get developer access to the same technology that powers our Premium grammar, style, and spelling checker.
https://languagetool.org/proofreading-api -
Style / tone rewriting Yes verified 2026-07-10
rephrase your sentences to be shorter, more fluent, or more formal
https://languagetool.org/insights/post/languagetool-features/ -
Browser extension Yes verified 2026-07-10
LanguageTool adds advanced spelling, grammar and style correction to Chrome and many other services and apps.
https://languagetool.org/chrome -
Office / Docs integration Yes verified 2026-07-10
LanguageTool adds advanced spelling, grammar and style correction to Google Docs and many other services and apps.
https://languagetool.org/google-docs -
Self-hostable Yes verified 2026-07-10
LanguageTool comes with its own embedded HTTP server, so you can send a text to a local instance of LanguageTool.
https://dev.languagetool.org/http-server -
Free tier limits Yes verified 2026-07-10
Character limit per text field
https://languagetool.org/premium -
Multilingual Yes verified 2026-07-10
It supports more than 30 languages, including English, French, Spanish, and German.
https://languagetool.org/proofreading-api -
Data used for training (opt-out) Yes verified 2026-07-10
None of the texts you send to the API are stored to ensure full privacy
https://languagetool.org/proofreading-api
FAQ
Yes. Grammarly, QuillBot and DeepL Write have a free tier or are fully free. Free-tier limits in the comparison table are verified and dated.