LanguageTool
What it is
Overview
A grammar and style checker that works across 30+ languages, catching errors as you type in browsers, email clients, and document editors. Built on a hybrid architecture with an open-source core plus proprietary AI components for paraphrasing and advanced style suggestions. The 7.6 million monthly users skew toward non-native English speakers, students, and writers who need multilingual support beyond what basic spellcheck provides.
At a glance
Usability & Quality overview
Best for
- multilingual writers
- non-native English speakers
- privacy-conscious users who want open-source
Watch out for
- Browser extension requires paid subscription
- Integration inconsistencies with Thunderbird and some tools
- No official Android app
Real product, not a wrapperIndependent product
LanguageTool offers specialized grammar checking across 30+ languages and integrates well with browsers and document editors, providing more than basic spell check. However, it's essentially a specialized grammar tool rather than a comprehensive AI writing assistant, limiting its scope compared to general-purpose AI models.
Strong evidenceQuality score
LanguageTool The leading AI grammar checker for multilingual writing with 30+ languages, but browser extension now requires premium
This score is our editorial judgment, computed automatically from the sources, weights, and dates shown above. It reflects the data we could verify as of July 15, 2026, not a guarantee or statement of fact about LanguageTool. Third-party ratings and quotes belong to their original platforms and authors. Thin data lowers our confidence label, and we say so instead of guessing. Work on LanguageTool? Dispute any datapoint and we will review it, publish your response, and correct verified errors.
Plans
Pricing
How free is free?
Free with limits
Basic grammar checking free; Premium features like AI paraphrasing require $24.90/mo
What you get for free
- Basic grammar and spelling checking
- Support for 30+ languages
- Browser and platform integrations
Behind the paywall
- Enhanced grammar, punctuation, and style checkingPremium
- Up to 150,000 characters per text fieldPremium
- Unlimited sentence paraphrasing powered by A.I.Premium
- Team management featuresTeams
Cost to actually use
Based on 37 classified review complaints about rate limits, credits, and billing.
Community feedback
Aggregated reviews
Ratings and quoted comments below are aggregated from third-party sources and reflect those users' views, not SearchTools.ai's.
What reviewers talk about
themes inside the Sentiment pillar — not score ingredients
67Output Quality64 mentions
“Ich verdiene meine Brötchen mit dem Schreiben eigener und dem Überarbeiten anderer Leute Texte. An meiner Seite ist stets ein heimtückischer Bursche namens Fehlerteufel. Ihm den Garaus zu machen, ist sehr schwierig, aber LanguageTool unterstützt mich bei diesem Unterfangen ganz p”
“Their marketing is better than the tool. I was excited about this but it's making recommendations to English that aren't grammatically correct and even completely changing the meaning of sentences (changing second person to first, for example). None of it is right. Support doesn”
“BROKEN How on Earth this can be so broken? "Yes, your fadback was very helpfulll." No mistakes found...”
“Finder ikke grammatikfejl i dansk tekst. I thought this would be different, because it said it could handle grammatical errors, but this doesn't find even the simplest of grammar errors in Danish text. Almost every program can check spelling errors, so there is nothing special he”
24Value & Pricing29 mentions
“Ich hatte mein Abo lange nicht genutzt und völlig vergessen zu kündigen. Der Support hat extrem schnell reagiert und mir die Zahlung sofort erstattet. Sehr freundlicher und unkomplizierter Service. Absolut empfehlenswert!”
“I have been billed after cancelling and contacted them for a refund but they never replied its been days now ”
“I purchased this app for work purposes. I’m in the Canary Islands, and they’re charging me VAT, something they’re not allowed to do. They acknowledge this but say their system is experiencing an issue, and they don’t know when it will be resolved. The solution is to refund my mon”
“Eigentlich ein super Tool. Aber CHF 6.66 in der Schweiz vs. € 3.99 sind ein Aufschlag von 60%, und das basierend auf der IP-Adresse. Das verstösst in der EU sowie in der Schweiz gegen geltendes Recht.”
44Reliability20 mentions
“Grammarly is an absolute memory hog on Safari, due to which Safari's performance takes a hit. Then I discovered an extension called LanguageTool through Reddit. As the name suggests, it checks your grammar and spelling. I have been using it for around 30 minutes and I can already”
“Es ist schon das 2. Mal. Wenn man von einem solchen Programm für die Arbeit abhängig ist, und dieses NICHT funktioniert wie es sein sollte, es ist SEHR BEDAUERLICH. Beim "Text Umschreiben" erscheint sofort Werbung um eure Produkte zu verkaufen. Dann gibt es keinerlei möglichkeit ”
“Wie bei LanguageTool die Abos und Mandanten freigeschalten und implementiert werden, wissen die wahrscheinlich selbst nicht. Ich habe ein Premium-Abo abgeschlossen und in der Desktop-Variante wird mir stoisch gesagt, ich hätte einen Basis-Account, mit dem man aber keine längeren ”
“I love that the browser extension works every time. I love that there is a desktop app as well so I can type in there then copy and paste. I would love a desktop pop-up:} But there is nothing I don't like. I am sorry, the upload tool wasn't working. I do have a screenshot, howeve”
23Support12 mentions
“Ich hatte mein Abo lange nicht genutzt und völlig vergessen zu kündigen. Der Support hat extrem schnell reagiert und mir die Zahlung sofort erstattet. Sehr freundlicher und unkomplizierter Service. Absolut empfehlenswert!”
“Their marketing is better than the tool. I was excited about this but it's making recommendations to English that aren't grammatically correct and even completely changing the meaning of sentences (changing second person to first, for example). None of it is right. Support doesn”
“I have been billed after cancelling and contacted them for a refund but they never replied its been days now ”
“Nach langem Hin und Her, scheinbar nicht intern trackbaren Support-Calls und einem ebensolchen Tracking-System (ich sollte die gleichen Dokumente und den gleichen XXL-Fragebogen nochmal senden) habe ich LanguageTool nun nach vielen Jahren endgültig abgeschafft. Das allein ist als”
72Ease of Use36 mentions
“LanguageTool is very easy to install and integrates seamlessly with my Chrome browser, which makes it convenient to use across everything I’m working on. It does a great job catching grammar and spelling mistakes in real time, helping me write more clearly and confidently without”
“Wie bei LanguageTool die Abos und Mandanten freigeschalten und implementiert werden, wissen die wahrscheinlich selbst nicht. Ich habe ein Premium-Abo abgeschlossen und in der Desktop-Variante wird mir stoisch gesagt, ich hätte einen Basis-Account, mit dem man aber keine längeren ”
“I love the certainty that LanguageTool offers me by ensuring that my texts are correct. I appreciate that I can save special words and skip validations when necessary, which provides great flexibility in its use. The integration in Chrome, as well as in the entire Google suite, m”
“It's super easy to use and gets the job done fast. The AI feature is a valuable aid in paraphrasing. It's great for checking spelling in desktop apps as well. I use it every day. Would appreciate it if it could suggest further grammar or structural problems. It makes my writing l”
50Trust derived from dimensions + predator detectionview math
A composite of the quality dimensions weighted by mention volume, then capped by predator / abuse-detection rules.
Reasoning
Watch & learn
Video content
YouTube
YOUTUBE3 viewsLanguageTool App Review - What to Know (Explained)
Target0691 month ago
Capabilities
Key features
Grammar Checker
Detects and corrects grammar, spelling, and punctuation errors in your writing
Writing Assistants
Helps you draft, edit, and polish written content across many formats
Paraphraser
Rewrites text in different words while keeping the original meaning intact
The honest take
What users love & flag
Distinct themes surfaced across 13.1K reviews from 4 sources — each grounded in real review text, ranked by how often it comes up.
Questions
Frequently asked
What is LanguageTool?
LanguageTool is an AI-powered grammar and style checker that detects errors across 30+ languages including English, German, French, and less common languages like Khmer and Tamil. It provides real-time suggestions for grammar, spelling, punctuation, and style improvements, and can automatically detect and switch between languages within the same document.
Is LanguageTool free?
Yes, LanguageTool offers a free tier with basic grammar and spell checking for up to 2,000 characters per text field across all supported languages. Premium subscriptions start at $4.99 per month (billed annually) and provide unlimited paraphrasing, up to 150,000 characters per text field, and advanced style checking.
What platforms does LanguageTool work with?
LanguageTool integrates with major browsers (Chrome, Firefox, Edge, Safari), email clients (Gmail, Outlook, Apple Mail), and office applications (Google Docs, Microsoft Word, LibreOffice). It also offers desktop applications for Windows and macOS, plus a web interface.
How many languages does LanguageTool support?
LanguageTool supports over 30 languages and dialects, including English variants for different regions, major European languages, and less commonly supported languages like Khmer and Tamil. The tool can automatically detect and switch between languages within the same document.
What is LanguageTool's AI paraphrasing feature?
LanguageTool includes an AI-powered paraphrasing tool that can rephrase sentences to make them more formal, fluent, simple, or concise. This feature is unlimited in premium subscriptions and helps users improve their writing style and clarity.
What's the difference between LanguageTool's free and premium versions?
The free version provides basic grammar and spell checking for up to 2,000 characters per text field. Premium versions offer unlimited paraphrasing, up to 150,000 characters per text field, advanced punctuation and style checking, personal dictionaries, and team features for collaborative writing.
How does LanguageTool indicate different types of errors?
LanguageTool uses colored underlines to highlight different types of issues - red for spelling mistakes and blue for style improvements. It also includes a Picky Mode for advanced punctuation and typography suggestions, making it easy to identify and address specific writing issues.
Does LanguageTool offer team features?
Yes, LanguageTool offers a Teams plan for up to 20 members at $13.28 per user annually. This includes all Premium features plus user management, Team Style Guide, and Team Dictionary for maintaining consistent writing standards across organizations.
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