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LanguageTool

LanguageTool

Open Source
Verified
AI-Enhanced

Your writing assistant for grammar, punctuation, style, and spelling.

GDPR
No training on your data
Works offline
Browser extension
Global
+4
Last updated: Oct 20, 2026
Open Source
Visit Site
More
languagetool.org

Quick Answer

AI

LanguageTool is a multilingual writing assistant for individuals and businesses. It supports over 30 languages, including English, German, and Spanish, with advanced checks for grammar, spelling, and style. Best for students, professional writers, and international teams needing error-free communication. Freemium pricing.

About LanguageToolAI

LanguageTool is an AI-based grammar checker and paraphrasing tool for individuals and businesses. It checks text for grammatical errors, spelling mistakes, punctuation issues, and offers style suggestions across more than 30 languages. Available as a web editor, browser add-on, and desktop app, it helps users craft polished and professional content. LanguageTool offers a free version with basic checks and a Premium version with advanced features and unlimited paraphrasing.

What Makes It UniqueAI

LanguageTool offers comprehensive grammar, spelling, and style checking in over 30 languages and dialects, including a unique 'Picky Mode' for advanced suggestions and a Team Style Guide for consistent brand voice. Its core technology is open-source, allowing users to review and contribute, or even set up their own LanguageTool server.

AI-extracted from public sources. May contain errors. Methodology · Report an error

Decision Intelligence

Best For

AI
Individuals who want to improve their writing for personal or professional use
Students writing academic papers, bachelor, or master theses
Professional writers seeking advanced grammar, style, and punctuation checks
Businesses and teams needing consistent brand communication and error-free writing
International teams communicating in multiple languages
Pricing Overview

Type

Open Source

Free Trial

No

Credit Card

Not Required

Free Plan

Yes

Dimension Scores

· 7.0 avg

How good it is, across universal quality axes

Ease of Use9/10
Customization7/10
Support7/10
Integration6/10
Compliance & Data Protection5/10
Performance8/10
AI-analyzed from product data·High confidenceHow we score

Task Scores

· 3.9 avg

What it can do, per category it works in · showing 4 of 10 tasks scoring 5+

Grammar Correction9/10
Paraphrasing7/10
Readability Improvement7/10
Batch Processing5/10

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

Capabilities
Writing
Summarization
Categories
General Writing
Text Processing
SEO Content
LimitationsAI
  • -Free plan is capped at 2,000 characters per text field
  • -Free plan offers only 3 sentence paraphrases per day
  • -Free plan provides limited style and tonality suggestions
  • -Team Plan subscriptions cannot be paused
  • -Member accounts within a Team Plan cannot be transferred to a third party
  • -Does not offer a telephone hotline for customer service
Fit Score

Complexity

Beginner

Company Size

Solo
Small
Medium
Enterprise

Target Team Size

Individual
Small Team
Large Team

Target Skill Level

Beginner
Intermediate
Technical Specifications
SDK Available (unknown)
MCP Compatible (unknown)
Team Features
Webhook Support (unknown)
Has Demo
Function Calling (unknown)
Sandbox Mode (unknown)
Audit Logs
No Signup
Works Offline
Requires Host App
Framework
MCP Server
Inference API
Browser Extensions
Authentication
OAuth
Google
Apple
Facebook
Developer Access
Deployment:
Hybrid
Response time (est.):
Fast
Compliance, Privacy & Trust
GDPR: Stated by vendor
DPA
SOC 2: No info available
HIPAA: No info available
Privacy & data handling
Trains on user data: No
Data retention: Until Deleted
Data deletion: Upon Request
Human review:
Recommended

Compliance audit trail

1 event
  1. GDPR

    Privacy Policy updated

    2mo ago · 2026-08-17 · source

The Model(s) Behind It

Model details — extracted from public vendor sources by our pipeline (Smart Generator + A3 cross-referencing) or admin-entered. Shown as claimed by the vendor; not independently audited by Intelloro.

Training Data Provenance
Not disclosed
Relevant to EU AI Act Art. 53 / Annex XI (GPAI)
Integrations & Connections
18 connections
CH
ChromePlugin

Browser add-on for grammar and style checking

ED
EdgePlugin

Browser add-on for grammar and style checking

FI
FirefoxPlugin

Browser add-on for grammar and style checking

OP
OperaPlugin

Browser add-on for grammar and style checking

SA
SafariPlugin

Browser add-on for grammar and style checking

GM
GmailPlugin

Email add-on for grammar and style checking

OU
OutlookPlugin

Email add-on for grammar and style checking

AP
Apple MailPlugin

Email add-on for grammar and style checking

Auto-updated

Trust Score

75/100

Very Good

Based on 8 data signals

Confidence: High

Reflects publicly available data, not an independent audit

Compliance & Verified38/38
VerifiedYes
GDPRYes
Human ReviewYes
Operational25/25
Data ResidencyEU
Reliability0/10

No published data

Market Proof10/10
Notable CustomersEuropean Union, Spiegel Magazine, Deutsche Presse-Agentur (dpa)
Company17/17
Company ListedYes
User Base1M-10M
FundingAcquired
Health—

Not yet checked

AI-Assisted Data

Some details are AI-generated estimates — verify with the vendor.

AI-generated estimate: Best For, Description, Limitations, Quick Answer, Tagline, What Makes Unique

How we source data

AI Governance & Regulatory Disclosures

Legally-sensitive fields — extracted from public vendor sources by our pipeline (Smart Generator + A3 cross-referencing) or admin-entered. Shown as claimed by the vendor; not independently audited by Intelloro.

EU AI Act Risk Tier
Unclassified

Switching & Migration

Migration Difficulty
Easy to Switch
Support:
Help Center
Email
Priority
Quick Stats
CategoryWriting
PlatformsWeb, Desktop, API +1
Integrations18+
User Base1M-10M
Launched2003
VerifiedOct 2026
Company & Links
CompanyLearneo, Inc.
Founded2003
Based inGermany
FundingAcquired
Documentation
All Features
Grammar and punctuation checking
Spelling correction
Style improvement suggestions
AI-powered sentence paraphrasing
Personal dictionary
Text statistics and productivity tracking
Team dictionary
Custom style guide for teams
Pricing Plans
Basic
Free
  • Grammar & Punctuation (Basic)
  • Basic Commas
  • Wrong Punctuation
  • Agreement Errors
  • Incorrect Word Combinations
  • Basic Standard Language
  • Premium (Individual)
    $5.83/month
  • Enhanced grammar, punctuation, and style checking (20,000+ additional checks)
  • Up to 150,000 characters per text field
  • Unlimited sentence paraphrasing powered by A.I.
  • Style Guide
  • Add-on for your browser
  • All benefits for Premium
  • Premium (Teams)
    $11.07/month
  • All benefits for Premium
  • User management
  • Team Style Guide
  • Team Dictionary
  • All Languages and Suggestions
  • Pricing verified from the vendor pricing page.

    User Reviews

    No reviews yet. Be the first to review!

    Who It's For
    3 roles
    Writers and AuthorsTechnical WritersEditors
    Platform, Content & Languages
    3 content types
    11 languages
    TextEmailDocumentEnglishGerman+11 more

    Output Languages

    English
    German
    Portuguese
    Spanish
    French
    Dutch
    Catalan

    Content Types

    Text
    Email
    Document

    Accepts

    Text

    Produces

    Text
    Languages: English, German, Portuguese, Spanish, French, Dutch, Catalan, Polish, Russian, Italian, Ukrainian

    Frequently Asked Questions