LanguageTool
Multilingual grammar and style checker for 30+ languages
- Category
- Writing & Content
- Pricing
- Free tier available; Premium from about $4.16/mo billed every 2 years (€99.90) up to €19.90/mo billed monthly; Team plans from €56.90/user/year
- Best for
- LanguageTool is best suited to multilingual writers, European businesses, students, and non-native English speakers who need reliable grammar and style checking in languages beyond English.
- Official site
- languagetool.org
- Last updated
- August 2026
LanguageTool is a grammar, style, and spell-checking service originally built on an open-source rule-based and statistical engine, developed by Germany-based LanguageTooler GmbH. It differentiates itself from competitors like Grammarly primarily on language coverage: it checks grammar, spelling, punctuation, and style in more than 30 languages, including German, French, Spanish, Portuguese, Dutch, Polish, and Russian, rather than being English-only. The underlying open-source LanguageTool project, used by many other applications and platforms, has existed since the mid-2000s, giving the commercial product a long technical track record that predates the current wave of AI-based writing assistants.
The commercial product ships as browser add-ons for Chrome, Firefox, Edge, and Safari, a desktop application for Windows, Mac, and Linux, mobile keyboard apps, and integrations for Google Docs, Microsoft Word and Outlook, LibreOffice, and Overleaf, alongside a developer-facing API. Premium adds advanced style rewriting, an AI-powered paraphraser, personal dictionary features, and team administration for organizations wanting centralized billing and shared style rules. It is commonly positioned as the multilingual alternative to Grammarly for European and international users, non-native English writers, and organizations with multilingual content needs.
LanguageTool is best suited to multilingual writers, European businesses, students, and non-native English speakers who need reliable grammar and style checking in languages beyond English. It is a weaker fit for users who specifically want cutting-edge AI rewriting/tone features, since its style suggestions are less advanced than purpose-built AI rewriters, and for U.S.-based buyers who prefer simple USD monthly pricing over LanguageTool's euro-denominated, multi-term billing structure.
Key features
Multilingual Grammar & Style Checking
Checks grammar, spelling, punctuation, and style across more than 30 languages, not just English, using a combination of rule-based and statistical models.
Style Rewriting & Clarity Suggestions
Premium tier suggests clearer, more concise phrasing and flags stylistic issues like redundancy and wordiness beyond simple error correction.
Browser Extensions
Available for Chrome, Firefox, Edge, and Safari, providing real-time checking across most websites and web-based writing tools.
Desktop App
A standalone application for Windows, Mac, and Linux for checking text outside the browser.
Office & Google Docs Integration
Add-ins for Microsoft Word and Outlook, plus integration with Google Docs and LibreOffice, for checking directly inside common writing tools.
Open-Source Rule Engine
Built on the long-running open-source LanguageTool project, giving the checking engine a transparent, community-vetted technical foundation.
Personal Dictionary
Lets Premium users save custom words and terms so the checker stops flagging intentional spellings, names, or jargon.
Team Admin Dashboard
Centralized billing and shared settings for organizations rolling LanguageTool out to up to 20 users per team plan.
Pricing breakdown
Free
- Core grammar, spelling & punctuation checks
- Limited style suggestions
- Browser extension access
Premium Monthly
- Advanced style and clarity suggestions
- AI-powered paraphraser
- Personal dictionary
- Priority checking
Premium Annual
- Everything in Premium
- Lower effective monthly cost than quarterly or monthly billing
Premium 2-Year
- Everything in Premium
- Lowest effective monthly rate available
Team
- Everything in Premium
- Centralized team billing
- Admin dashboard
- Shared style settings
Pros and cons
Pros
- LanguageTool's support for 30+ languages makes it one of the few mainstream grammar checkers usable as a primary tool for non-English and multilingual writing, a gap most English-first competitors don't fill.
- Because the core engine is open source, technically minded users and organizations can inspect or self-host parts of the checking logic, which builds trust that's harder to get from fully closed-source competitors.
- Long-term billing (the 2-year Premium plan) brings the effective monthly cost down to roughly $4-5, making it one of the more affordable premium grammar checkers when paid upfront.
- Integration coverage spans browsers, desktop, and major office suites including LibreOffice and Overleaf, appealing to academic and technical writers as well as everyday users.
- Education discounts of up to 20% off Premium make it comparatively accessible for students and teachers checking work in a non-English language.
Cons
- Pricing is quoted in euros and structured around quarterly/annual/2-year tiers, which can make it harder for non-European, dollar-based users to quickly compare cost against USD-priced competitors like Grammarly.
- LanguageTool's AI-assisted style rewriting is generally considered less sophisticated and less fluent than dedicated AI rewriters such as Wordtune or Grammarly's newer generative features.
- Review sentiment differs notably by region — Trustpilot ratings and complaint themes (particularly around billing and recent policy changes) vary between the main site and country-specific pages.
- The monthly Premium price (€19.90) is comparatively steep versus the annual or 2-year options, which can catch users off guard if they don't commit to a longer term upfront.
What reviewers say
LanguageTool (listed on G2 under its parent company LanguageTooler) holds a 4.4-out-of-5 rating from 43 verified reviews, reflecting generally positive sentiment toward its multilingual checking accuracy, with more mixed and region-dependent feedback on Trustpilot around billing practices.
Frequently praised
- Reliable multilingual grammar and style checking
- Good integration coverage across browsers and office tools
- Long-term pricing is affordable relative to competitors
Frequently criticized
- Euro-based, multi-tier pricing can be confusing to compare
- Style/AI rewriting less advanced than dedicated AI rewriters
- Some regional Trustpilot reviews cite billing and cancellation frustrations
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Compare →Frequently asked questions
How many languages does LanguageTool support?
LanguageTool checks grammar, spelling, punctuation, and style in more than 30 languages, including German, French, Spanish, Portuguese, Dutch, Polish, and Russian, in addition to English.
Is LanguageTool free to use?
Yes, LanguageTool offers a free plan covering core grammar, spelling, and punctuation checks, with advanced style suggestions and AI paraphrasing reserved for Premium.
Is LanguageTool open source?
The underlying LanguageTool checking engine is built on a long-running open-source project, though the full commercial product (Premium features, hosted API, apps) is proprietary.
What is the cheapest way to get LanguageTool Premium?
The 2-year Premium subscription at €99.90 works out to roughly €4.16 per month, the lowest effective rate compared to monthly, quarterly, or annual billing.
Does LanguageTool integrate with Microsoft Word and Google Docs?
Yes, LanguageTool offers add-ins for Microsoft Word and Outlook and integrates with Google Docs, in addition to browser extensions and a standalone desktop app.
Does LanguageTool offer team or educational pricing?
Yes, team plans for up to 20 users start at €56.90 per user per year, and students and teachers can get up to 20% off a Premium subscription.
Ready to try LanguageTool?
Head to the official site to explore pricing and start a free trial where available.
Visit LanguageTool →