LanguageTool Review
AI WritingA privacy-focused, multilingual grammar, style, and spelling checker supporting 30+ languages, with an open-source core.
Editor's Verdict
LanguageTool earns a 4.4/5 rating as one of the more capable options in the ai writing space. Its standout strength — supports 30+ languages, strong for european languages — makes it particularly valuable when that capability matters most to your workflow. The main trade-off is weaker for east asian languages such as japanese, which is worth weighing against the alternatives before committing. Because the free plan lets you validate fit without risk, there is very little downside to testing it first.
Table of Contents
What is LanguageTool?
LanguageTool is a multilingual writing assistant that checks grammar, spelling, punctuation, and style in more than 30 languages, including English, German, French, Spanish, and Dutch. It is a popular privacy-conscious alternative to Grammarly: its core engine is open source, it can be self-hosted for sensitive environments, and the company is based in the EU under GDPR. Beyond catching mistakes, the Premium tier adds style and tone suggestions, a paraphrasing feature, and a personal dictionary. LanguageTool works through browser extensions, add-ins for Microsoft Word and Google Docs, desktop apps, and mobile keyboards, checking your text almost anywhere you write. Its multilingual breadth makes it especially useful for people who write in several European languages, though like all such tools its suggestions should be reviewed rather than accepted blindly, and it is weaker for East Asian languages such as Japanese.
Who is LanguageTool for?
LanguageTool is best suited for bloggers, copywriters, marketers, and anyone producing long-form written content regularly. Its free plan lowers the barrier to entry, making it easy to evaluate before committing. The breadth of features (6+) — including Multilingual grammar, spelling, and punctuation checking (30+ languages) and Style and tone suggestions (Premium) — means you rarely need to switch to another tool for related tasks. Users frequently highlight one specific strength: supports 30+ languages, strong for european languages.
Pricing plans & value for money
LanguageTool offers the following plans. Prices reflect the latest available information at the time of review and may change; always confirm on the official site before purchasing.
Key features & capabilities
Here is what LanguageTool brings to the table, ranked roughly by how central each capability is to the product experience.
Pros and cons
After evaluating LanguageTool against the rest of the ai writing field, these are the trade-offs that stood out in day-to-day use.
What we liked
- ●Supports 30+ languages, strong for European languages
- ●Privacy-focused: open-source core and self-hosting option
- ●EU-based under GDPR
- ●Browser, Word, Google Docs, desktop, and mobile integrations
- ●Capable free plan for everyday checks
What could be better
- ●Weaker for East Asian languages such as Japanese
- ●Advanced style and paraphrasing require Premium
- ●Style suggestions are less nuanced than Grammarly's for English
How to get started with LanguageTool
A practical, five-step path we recommend for anyone evaluating LanguageTool for the first time — designed to minimise wasted time and help you decide fast.
1Sign up for LanguageTool
Head to the official LanguageTool website and create an account. You can start with the free plan without entering payment details, which is ideal for testing how it fits your workflow.
2Set up your workspace
Install the app on web if a native client is available, or simply open it in your browser. Configure basic preferences such as language, notifications, and default output style so that subsequent runs feel consistent.
3Run your first task with Multilingual grammar, spelling, and punctuation checking (30+ languages)
Start with a small, low-stakes task to understand how LanguageTool responds. Write a clear prompt or input, review the output, and iterate. This low-risk exploration is the fastest way to build intuition for what the tool excels at.
4Integrate into your daily workflow
Once you know its strengths, introduce LanguageTool into one concrete workflow — not ten. Replace one existing step with it and measure the time saved or quality gained over a week before expanding usage further.
5Upgrade based on real usage
Rather than upgrading upfront, monitor which limits you actually hit (message count, output length, export features). Upgrade only when a specific limit blocks your productivity, not because the higher plan looks more attractive on paper.
Best LanguageTool alternatives
Not sure LanguageTool is the right fit? These comparable tools in the ai writing space are worth considering depending on your priorities.
Grammarly
An AI-powered English writing assistant. Provides grammar and spell checking along with style improvement, tone adjustment, and plagiarism detection.
Offers a comparable editorial rating at a higher price point. Best if you want industry-leading english grammar and spell check accuracy.
QuillBot
An all-in-one AI writing assistant best known for its paraphraser, plus a grammar checker, summarizer, translator, and plagiarism checker.
Offers a comparable editorial rating at a higher price point. Best if you want fast, high-quality paraphrasing with multiple rewriting modes.
DeepL Write
An AI writing improvement tool from DeepL that refines phrasing, tone, and style—best known for natural, fluent rewrites.
Offers a comparable editorial rating. Best if you want exceptionally natural, fluent rewrites from deepl's language models.
Frequently asked questions
Is LanguageTool a good free Grammarly alternative?+
Yes, especially if you value privacy or write in multiple languages. The free plan covers grammar and spelling in 30+ languages, and the open-source core can be self-hosted. Grammarly still offers more nuanced English style suggestions, but LanguageTool is far stronger across non-English European languages.
Does LanguageTool support Japanese?+
Japanese is not among its well-supported languages; LanguageTool is strongest for English and European languages such as German, French, and Spanish. For Japanese proofreading you will get better results from dedicated Japanese tools or general LLMs.
Can I keep my text private with LanguageTool?+
Yes. LanguageTool is EU-based and GDPR-compliant, and its core engine is open source, so organizations can self-host it on their own servers and keep sensitive text from ever leaving their infrastructure.
Ready to try LanguageTool?
Start with the free plan — no credit card required.
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Reviewed by: AIpedia Editorial Team · Last updated: June 27, 2026 · Methodology: How we test & rate
This review reflects our editorial opinion based on hands-on testing, pricing verification, and cross-referencing with official documentation. We do not accept payment in exchange for favourable reviews. Read our full editorial policy.