LanguageTool
Grammar and style checker for more than 30 languages
What is LanguageTool?
LanguageTool is a grammar, spelling and style checker that covers more than 30 languages and dialects and includes an AI paraphrasing tool. It works through browser add-ons, office and email plugins, a web editor and apps for Windows, macOS and iOS. It began in 2003 as an open-source project, and its core checking technology is still published as open-source software.
LanguageTool has a free plan. Paid plans start at $4.99 per month on a 2-year plan ($119.80); $69.90 billed annually. See every plan
Good for
- People who write in several languages, not only English
- LibreOffice, Thunderbird and Apple Pages users who want a checker add-on
- Developers who need a proofreading API or a checker they can host themselves
Worth knowing
- The free Basic plan checks 2,000 characters per text field and allows 3 AI rephrasings a day.
- There is no free trial of Premium; LanguageTool offers a 14-day money-back guarantee instead.
- Monthly billing is $24.90, more than four times the per-month cost of the annual plan.
- Apps are listed for Windows, macOS and iOS; no Android app appears on the site.
Key features
- Grammar, spelling and style checks
- Checks grammar, punctuation, spelling, casing and style. Premium adds more than 20,000 extra checks for English, German, French, Spanish, Dutch, Polish and Portuguese.
- AI paraphrasing
- Rephrases a sentence to be more formal, more fluid or shorter. Basic accounts get 3 rephrasings a day and Premium removes the limit.
- Long-text checking
- Premium checks up to 150,000 characters per text field, against 2,000 on the Basic plan.
- Style guide and dictionaries
- Custom rules enforce consistent wording. Teams share a style guide and a dictionary of approved terms, with admins deciding who can add to them.
- Add-ons and apps
- Browser add-ons for Chrome, Edge, Firefox, Safari and Opera, plugins for Google Docs, Word, Apple Pages and LibreOffice, email add-ons, and apps for Windows, macOS and iOS.
- Open-source core and API
- The core checker is open source, with code on GitHub, and users can set up their own LanguageTool server. A hosted Proofreading API accepts up to 60,000 characters per request.
LanguageTool pricing
- Starts at
- $4.99 per month on a 2-year plan ($119.80); $69.90 billed annually
- Free plan
- Basic plan: grammar, punctuation and spelling checks in 30+ languages on up to 2,000 characters per text field, with limited Picky Mode and 3 AI rephrasings a day.
- Free trial
- None listed
| Plan | Price | What you get |
|---|---|---|
| Basic | $0 | Grammar, punctuation and spelling checks on up to 2,000 characters per text field, with 3 AI sentence rephrasings a day. |
| Premium | $5.83per month, billed annually ($69.90); $24.90 billed monthly | Up to 150,000 characters per text field, 20,000+ extra checks, unlimited AI paraphrasing and a personal style guide. Also $49.90 a quarter or $119.80 for 2 years. |
| Teams | $66.40per user / year, for a team of 2 users | Every Premium feature plus user management, a team style guide and a team dictionary. Sold from 2 users, with a lower per-user price for larger teams. |
Read from languagetool.org on Oct 5, 2026. Prices change, so confirm with LanguageTool before you buy.
Ways to pay less
- Annual discountLonger billing terms cost less per month
Premium is $24.90 billed monthly, $49.90 a quarter, $69.90 a year or $119.80 for two years, which works out to about $5.83 and $4.99 a month on the two longest terms.
Stated on languagetool.org - EducationUp to 20% off for students and educators
Students, teachers and professors can claim an educational discount of up to 20% off a Premium subscription.
Stated on languagetool.org - Other savingsTeam seats priced below individual plans
On Teams, each seat costs less than the $69.90 individual annual price: $66.40 per user for 2 users and $62.91 per user from 10 users.
Stated on languagetool.org - Other savingsLimited-time 20% discount on Premium
The pricing page was advertising a limited-time 20% discount on Premium, with a countdown, when it was checked on 2026-10-05.
Stated on languagetool.org
Works with
- Google Docs
- Microsoft Word
- Gmail
- LibreOffice
- Thunderbird
- Apple Mail
- Apple Pages
- Outlook
LanguageTool alternatives
- LanguageTool vs Grammarly
Free plan · from $12/mo
- LanguageTool vs QuillBot
Free plan · from $8.33/mo
- LanguageTool vs ProWritingAid
Free plan · from $10/mo
- LanguageTool vs DeepL Write
Free plan · from €6.99/mo
- LanguageTool vs Antidote
Free trial · from $59.95/yr
Common questions
Is LanguageTool free?
LanguageTool has a free plan. Basic plan: grammar, punctuation and spelling checks in 30+ languages on up to 2,000 characters per text field, with limited Picky Mode and 3 AI rephrasings a day. Paid plans start at $4.99 per month on a 2-year plan ($119.80); $69.90 billed annually.
How much does LanguageTool cost?
LanguageTool lists 3 plans. Basic: $0. Premium: $5.83 per month, billed annually ($69.90); $24.90 billed monthly. Teams: $66.40 per user / year, for a team of 2 users. Prices were read from languagetool.org on Oct 5, 2026.
What platforms does LanguageTool work on?
LanguageTool is available on Web, macOS, Windows and iOS. It also has a browser extension.
Does LanguageTool offer any discounts?
LanguageTool publicly lists the following: Longer billing terms cost less per month; Up to 20% off for students and educators; Team seats priced below individual plans; Limited-time 20% discount on Premium.
Does LanguageTool have an Android app?
No Android app was listed when its pages were read on Oct 5, 2026. LanguageTool is listed for Web, macOS, Windows and iOS.
Does LanguageTool have a Linux app?
No Linux app was listed when its pages were read on Oct 5, 2026. LanguageTool is listed for Web, macOS, Windows and iOS.
Is LanguageTool open source?
Yes. LanguageTool is open source, according to its own site. It can also be run on a server of your own.
Does LanguageTool have an API?
Yes. LanguageTool offers a public API, according to its own site.
What does LanguageTool integrate with?
LanguageTool's listing names Google Docs, Microsoft Word, Gmail, LibreOffice, Thunderbird, Apple Mail, Apple Pages and Outlook. A listing names up to eight integrations, so it may connect to more.
Does LanguageTool have a student discount?
Up to 20% off for students and educators. Students, teachers and professors can claim an educational discount of up to 20% off a Premium subscription.
Who makes LanguageTool?
LanguageTool is made by LanguageTooler GmbH. It dates from 2003.
What are the alternatives to LanguageTool?
The closest alternatives to LanguageTool in our directory are Grammarly, QuillBot, ProWritingAid, DeepL Write and Antidote. Each one has a side-by-side comparison with LanguageTool.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Oct 5, 2026.