What is LanguageTool?
LanguageTool is an AI-based writing assistant that checks text for grammar, punctuation, spelling and style errors. You paste text into the online editor, start typing, or use the checker through browser add-ons, email add-ons, Office plugins and desktop apps for Windows and macOS. It detects the language automatically and supports more than 30 languages and dialects, including English, German, Portuguese, Spanish, French and Dutch.
Beyond corrections, the tool offers a paraphrasing tool that rewrites sentences to be more formal, fluid or shorter, a personal dictionary, statistics on your writing progress, and a Picky Mode for stricter style and typography suggestions. The Premium plan adds extended checking, longer text limits and unlimited paraphrasing, and a business offering provides a shared style guide, team dictionary and a Proofreading API.
Key features
- Grammar, spelling and punctuation checking in over 30 languages
- AI-powered sentence paraphrasing
- Personal dictionary and statistics
- Picky Mode for advanced style and typography suggestions
- Browser, email and Office add-ons
- Team style guide and dictionary for business
Who is it for
- Students and academics writing essays and theses
- Professionals writing emails and documents
- Non-native speakers of English and other languages
- Teams that need consistent brand voice
How to get started with LanguageTool
- Go to the LanguageTool website and paste your text into the editor.
- Choose the text language or leave automatic detection on.
- Review the highlighted errors and accept the suggested corrections.
- Optionally install the browser add-on or the Word plugin.
- You write papers, emails or texts in foreign languages and need correctness.
- You want spelling and grammar checks directly in your browser or in Google Docs.
- You need support for many languages, e.g. German, Spanish or Dutch.
- You need advanced style checking and paraphrasing without paying for the Premium plan.
- You want to check very long texts in the free version.
Pros and cons
- Supports over 30 languages and works across many apps
- Free basic grammar checking is available
- Extended checks, paraphrasing and longer texts require Premium
- Premium prices shown on the page could not be displayed in the provided text
LanguageTool pricing
| Plan | Price | Includes |
|---|---|---|
| Free | 0 PLN | podstawowe sprawdzanie gramatyki |
| Premium miesięczny | 49,90 PLN / month | do 150 000 znaków w polu, nielimitowane parafrazy AI |
| Premium kwartalny | 99,90 PLN | za kwartał |
| Premium roczny | 149,90 PLN / year | ok. 12,49 zł miesięcznie |
| Premium 2 lata | 249,90 PLN | za 2 lata, ok. 10,41 zł miesięcznie |
Prices copied from LanguageTool pricing, checked October 12, 2026. Currency as shown by the vendor; taxes may apply.
LanguageTool pricing details →
Is LanguageTool free?
Yes, there is a free plan. Free grammar checker with basic checks in the online editor and browser add-ons.
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LanguageTool alternatives
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 Grammarly | 12 USD/mo | yes | Writing & editing |
 QuillBot | not listed | ? | Writing & editing |
 Compose AI | not listed | yes | Writing & editing |
 Clever AI Humanizer | not listed | yes | Writing & editing |
 HyperWrite | 16 USD/mo | yes | Writing & editing |
 Mutiny | 50 USD/mo | trial | Writing & editing |
All alternatives to LanguageTool →
Comparisons
FAQ
What is LanguageTool used for?
AI-based grammar, spelling and style checker for writing in over 30 languages, for individuals and teams.
Is LanguageTool free?
Yes, there is a free plan. Free grammar checker with basic checks in the online editor and browser add-ons.
How much does LanguageTool cost?
The cheapest paid plan is 49,90 PLN/mo (vendor pricing, October 12, 2026).
What are the best LanguageTool alternatives?
Closest alternatives: Grammarly, QuillBot, Compose AI, Clever AI Humanizer, HyperWrite.
Data checked October 12, 2026 on the vendor website (languagetool.org).