LanguageTool logo - Writing & Translation brand identity

LanguageTool (2026)

Expert Reviewed
by Dr. William BobosLast reviewed: Nov 28, 2025

AI-Powered Writing Assistant for 30+ Languages – Grammar, Style & More

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4 ratings
4.0
Monthly users
8.8M
Pricing
Paid from $4.99 / month
Platform
Web App / Browser Extension
Best for
Content Creators / Educators

Overview

LanguageTool is an AI-powered, multilingual writing assistant and open-source software for spelling, grammar, punctuation, style, tonality, and repetition checking. It supports 30+ languages, offers advanced KI-powered rephrasing, personal and team style guides, the rigorous mode for professional texts, unlimited character limits in premium, personal dict...

LanguageTool Writing & Translation showing Writing & Translation - AI-Powered Writing Assistant for 30+ Languages – Grammar,

Key Features

Translation accuracy

Translate content between dozens of languages while preserving tone and nuance.

Device-agnostic access

Multi-platform support ensures everyone can use LanguageTool regardless of their device preference. LanguageTool serves

Developer-friendly API

Webhook and API support keep LanguageTool aligned with bespoke internal processes.

Client libraries available

Official SDKs handle authentication, retries, and error handling automatically.

Open-source transparency

Teams can inspect the codebase and adapt LanguageTool to specific environments.

Data-driven decision support

LanguageTool consolidates data to expose actionable insights quickly. Dashboards in LanguageTool are useful when they ex

Video Showcase

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4.0 / 5based on 4 ratings

About LanguageTool

“AI-Powered Writing Assistant for 30+ Languages – Grammar, Style & More”

LanguageTool is an open-source writing & translation tool developed by LanguageTool (DE) designed for content creators, educators and students. LanguageTool is a Writing & Productivity solution for Content Creators, Educators, and Remote Workers that combines AI-powered grammar, style, and tone checking across 30+ languages with unlimited rephrasing and team collaboration features. Pricing: Freemium. With over 8.8 million monthly visits, LanguageTool has established a significant user base. LanguageTool follows a freemium pricing model, with plans from a free plan up to $9.49/mo. It is available on Web App, Browser Extension, Desktop App and Plugin/Integration. Developer integration is supported through Python and JavaScript/TypeScript SDKs. LanguageTool integrates with Plugin/Integration. It competes in the same space as Grammarly, ProWritingAid and QuillBot. Explore more writing & translation tools or browse all categories.
Writing & TranslationCompareContent Creators

LanguageTool Snapshot

Key facts we track so you can judge fit before visiting the provider.

Primary category
Writing & Translation
Best fit
Content Creators, Educators, Students +5 more
Platforms
Web App, Browser Extension, Desktop App +1 more
Pricing signal
Freemium - Paid from $4.99 / month
Provider context
LanguageTool - DE
Known integrations
Plugin/Integration
Developer access
API documentation, Python, JavaScript/TypeScript
Data handling
Global hosting, Privacy policy linked

Before you choose LanguageTool

  • Confirm LanguageTool's current limits, renewal terms, and seat pricing on the official site.
  • Review privacy, retention, and data-processing terms before using sensitive data.
  • Test the integrations or API path against one real workflow before rollout.
  • Make sure the supported platform matches where your team actually works.

Listing data is compiled from structured provider information, public signals, submissions, and periodic checks where available. Treat this page as a shortlist aid, then verify pricing, compliance, and product limits with the provider before making a business-critical decision.

How LanguageTool Works

Understanding the core functionality and approach of LanguageTool.

Usage-based pricing keeps LanguageTool aligned with actual consumption. Finance teams pay only for the outcomes the organization really uses. Integrations with Plugin/Integration keep LanguageTool connected to your workflow.

Key Features

Explore what makes LanguageTool stand out.

Translation accuracy

Translate content between dozens of languages while preserving tone and nuance.

Device-agnostic access

Multi-platform support ensures everyone can use LanguageTool regardless of their device preference. LanguageTool serves two audiences: Web App, Browser Extension, and Desktop App apps for daily use, plus Python and JavaScript/TypeScript SDKs for custom builds.

Developer-friendly API

Webhook and API support keep LanguageTool aligned with bespoke internal processes.

Client libraries available

Official SDKs handle authentication, retries, and error handling automatically.

Open-source transparency

Teams can inspect the codebase and adapt LanguageTool to specific environments.

Data-driven decision support

LanguageTool consolidates data to expose actionable insights quickly. Dashboards in LanguageTool are useful when they expose metrics your team already reviews.

Prompt Engineering Guide

Use Cases

Discover how different audiences leverage LanguageTool.

Content Creators

Localize content globally

Teams use LanguageTool to translate product documentation, marketing materials, and support content.

Educators

Work from anywhere

Cross-platform sync ensures work started on one device continues seamlessly on another.

Content Creators

Streamline creative processes

Collaboration features keep stakeholders aligned throughout the creative process.

Learn more: AI Tools for Writers

FAQ about LanguageTool

What is LanguageTool and what does it do?

LanguageTool is AI-Powered Writing Assistant for 30+ Languages – Grammar, Style & More. LanguageTool is an AI-powered, multilingual writing assistant and open-source software for spelling, grammar, punctuation, style, tonality, and repetition checking. It supports 30+ languages, offers advanced KI-powered rephrasing, personal and team style guides, the rigorous mode for professional texts, unlimited character limits in premium, personal dictionary, and is available as a web app, browser extensions, API, desktop apps, and plugins for office suites like LibreOffice, Microsoft Word, Google Docs, and Slack. DSGVO-compliant with servers in Germany and the EU. Available on Web App, Browser Extension, Desktop App and 1 more platforms, LanguageTool is designed to enhance productivity and deliver professional-grade writing & translation capabilities.

How much does LanguageTool cost?

LanguageTool offers Freemium pricing options. Free plan with 20,000 characters per check; Premium individual at $4.99/month (billed annually at $59.90) or $5.01/month (monthly billing); Team plan starting at $9. Current estimates suggest pricing from Paid from $4.99 / month. You can start with a free tier to test the platform before committing to a paid plan. For the most current pricing details and plan comparisons, visit the official LanguageTool pricing page or contact their sales team for custom enterprise quotes. See also Free vs Paid AI Tools for guidance on choosing the right plan.

Is LanguageTool secure and compliant with data privacy regulations?

LanguageTool takes data privacy seriously and implements industry-standard security measures. Data is hosted in Global, providing transparency about where your information resides. For comprehensive details about data handling, encryption, and privacy practices, review their official privacy policy. On-premise deployment options are available for organizations with strict data residency requirements. Security and compliance are continuously updated to meet evolving industry standards.
What platforms does LanguageTool support?
LanguageTool is available on Web App, Browser Extension, Desktop App, Plugin/Integration. The web application provides full functionality directly in your browser without requiring downloads. This multi-platform approach ensures you can use LanguageTool wherever and however you work best.
How can I try LanguageTool before purchasing?
The freemium model gives you access to essential features at no cost, with premium capabilities available through paid upgrades. Testing the platform before committing ensures it meets your specific requirements and integrates smoothly with your existing workflows. Support for Over 20 languages including English, Spanish, French, German, and more. makes it accessible to global users.
What file formats does LanguageTool support?
LanguageTool accepts Supports text input in various formats including plain text, Microsoft Word documents, and Google Docs. as input formats, making it compatible with your existing files and workflows. Output is delivered in Delivers detailed error reports with suggestions for corrections to help users improve the quality of their writing., ensuring compatibility with downstream tools and platforms. This format flexibility allows seamless integration into diverse tech stacks and creative pipelines.
Who develops and maintains LanguageTool?
LanguageTool is developed and maintained by LanguageTool, based in DE. Most recently updated in November 2025, the platform remains actively maintained with regular feature releases and bug fixes. This ongoing commitment ensures LanguageTool stays competitive and aligned with industry best practices.
How do I get access to LanguageTool?
LanguageTool is freely available to everyone without registration requirements. You can start using the platform immediately without going through lengthy approval processes.
How is usage measured and billed in LanguageTool?
LanguageTool uses Pay-as-You-Go as billing metrics. This usage model ensures you only pay for what you actually use, avoiding unnecessary overhead costs for features you don't need.
What deployment options does LanguageTool offer?
LanguageTool supports Cloud, OnPremise deployment configurations. Cloud-hosted options provide instant scalability without infrastructure management overhead. On-premise installations give organizations complete control over data residency and security policies. Choose the deployment model that best aligns with your technical requirements, security constraints, and operational preferences.

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Providers can update product facts, pricing context, screenshots, and launch notes. Paid placements are labeled separately and do not replace editorial or data-quality review.

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How to Evaluate LanguageTool

Compare LanguageTool with Grammarly, ProWritingAid, QuillBot and other alternatives before you decide. The goal is not to pick the most popular product; it is to find the tool that fits your actual workflow, risk level, and budget.

  1. Step 1Test LanguageTool with one real workflow before moving important work into it.
  2. Step 2Model the full monthly cost at your expected usage, including seats, limits, and overages.
  3. Step 3Verify the integration path with your existing stack before you commit.
  4. Step 4Review privacy, retention, and compliance terms before using sensitive data.

Use the video walkthrough to check whether the interface matches the claims. For developer teams, inspect the Python SDK and JavaScript/TypeScript support. Review the API documentation for auth, rate limits, errors, and export behavior. For broader context, browse more writing & translation tools for content creators, or compare this page against the category hub. New to AI tool evaluation? Start with AI Tool Navigator.

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